<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:d63e6612-0c36-434c-8b28-85e07fcdbf6c,g:150d8b19-5cd0-4426-b3b9-c03c940ec2ca-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.muellerwaterproducts.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="mwa-20211231.xsd#ConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://www.muellerwaterproducts.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_990cd355-025d-4683-b02d-78e48e270397" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_22fb4b9a-0af7-4c20-b8ca-af8197acbc59" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_990cd355-025d-4683-b02d-78e48e270397" xlink:to="loc_us-gaap_AssetsCurrent_22fb4b9a-0af7-4c20-b8ca-af8197acbc59" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_8e6320d3-fac1-499c-81af-d4bf63b6bf60" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_990cd355-025d-4683-b02d-78e48e270397" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_8e6320d3-fac1-499c-81af-d4bf63b6bf60" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_e8a17ed5-fb86-452a-af5a-4b85b6cbc750" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_990cd355-025d-4683-b02d-78e48e270397" xlink:to="loc_us-gaap_Goodwill_e8a17ed5-fb86-452a-af5a-4b85b6cbc750" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ddc44354-71c2-4d48-8b68-894e69bce75e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_990cd355-025d-4683-b02d-78e48e270397" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ddc44354-71c2-4d48-8b68-894e69bce75e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_13a6c967-a8dc-4fa1-98ea-0ffac8128bb7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_990cd355-025d-4683-b02d-78e48e270397" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_13a6c967-a8dc-4fa1-98ea-0ffac8128bb7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_c4473c35-b13d-4292-8ef6-30c0c3d9f268" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_10b8da4a-538a-4311-97a9-da3e596a1bdc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c4473c35-b13d-4292-8ef6-30c0c3d9f268" xlink:to="loc_us-gaap_Liabilities_10b8da4a-538a-4311-97a9-da3e596a1bdc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_12983682-de26-4846-8797-d278f963dded" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_c4473c35-b13d-4292-8ef6-30c0c3d9f268" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_12983682-de26-4846-8797-d278f963dded" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_af0ee65b-2e51-45b8-a01b-feda72f888a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_23e6853f-b647-4907-b4b1-d0ee8ebda2ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_af0ee65b-2e51-45b8-a01b-feda72f888a0" xlink:to="loc_us-gaap_LongTermDebtCurrent_23e6853f-b647-4907-b4b1-d0ee8ebda2ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_f5ed3d46-a005-4994-8691-38a16c320ff9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_af0ee65b-2e51-45b8-a01b-feda72f888a0" xlink:to="loc_us-gaap_AccountsPayableCurrent_f5ed3d46-a005-4994-8691-38a16c320ff9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_e185b1ca-e240-4d15-b4ed-46e37c2e37f0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_af0ee65b-2e51-45b8-a01b-feda72f888a0" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_e185b1ca-e240-4d15-b4ed-46e37c2e37f0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_699afba4-4fff-45c9-9457-1e1b19b294a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_b6da2f6d-ec54-4e25-a625-3b6e9e5980c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_699afba4-4fff-45c9-9457-1e1b19b294a6" xlink:to="loc_us-gaap_LiabilitiesCurrent_b6da2f6d-ec54-4e25-a625-3b6e9e5980c4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_8d266143-320e-4d81-8e09-574e41dc807d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_699afba4-4fff-45c9-9457-1e1b19b294a6" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_8d266143-320e-4d81-8e09-574e41dc807d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_c349e641-4d15-4c6c-a22f-3998ff3eef0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_699afba4-4fff-45c9-9457-1e1b19b294a6" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_c349e641-4d15-4c6c-a22f-3998ff3eef0e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent_3f6d08a0-91bc-4da3-bb70-f806cbbdb0d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_699afba4-4fff-45c9-9457-1e1b19b294a6" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent_3f6d08a0-91bc-4da3-bb70-f806cbbdb0d7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_50eaae9b-e922-416b-8757-46dbd3a03cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_80e7e331-279f-46f4-8f8c-85bc21e85f03" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_50eaae9b-e922-416b-8757-46dbd3a03cb5" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_80e7e331-279f-46f4-8f8c-85bc21e85f03" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_fdc7ca1f-5db4-4288-92d7-49b0cc28a6f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_50eaae9b-e922-416b-8757-46dbd3a03cb5" xlink:to="loc_us-gaap_OtherAssetsCurrent_fdc7ca1f-5db4-4288-92d7-49b0cc28a6f6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_22b4af66-5082-496e-9c1e-85f5fccfc595" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_50eaae9b-e922-416b-8757-46dbd3a03cb5" xlink:to="loc_us-gaap_InventoryNet_22b4af66-5082-496e-9c1e-85f5fccfc595" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_76f0ceae-78d1-451f-8a68-35a35ae692fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_50eaae9b-e922-416b-8757-46dbd3a03cb5" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_76f0ceae-78d1-451f-8a68-35a35ae692fe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0df6c033-2a5e-4269-8bf8-2e9546976ece" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_6f75ac3a-fdf5-48e6-9274-c007d5e5349a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0df6c033-2a5e-4269-8bf8-2e9546976ece" xlink:to="loc_us-gaap_CommonStockValue_6f75ac3a-fdf5-48e6-9274-c007d5e5349a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_559b7089-d3c3-43e2-9d5a-7be0e962b13f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0df6c033-2a5e-4269-8bf8-2e9546976ece" xlink:to="loc_us-gaap_AdditionalPaidInCapital_559b7089-d3c3-43e2-9d5a-7be0e962b13f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_e29c0446-60df-4e6f-bd4f-bd68422df7d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0df6c033-2a5e-4269-8bf8-2e9546976ece" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_e29c0446-60df-4e6f-bd4f-bd68422df7d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7ea0b885-24dd-4a59-afb8-eb1fb3224e59" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_0df6c033-2a5e-4269-8bf8-2e9546976ece" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_7ea0b885-24dd-4a59-afb8-eb1fb3224e59" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfOperations" xlink:type="simple" xlink:href="mwa-20211231.xsd#ConsolidatedStatementsOfOperations"/>
  <link:calculationLink xlink:role="http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_2c446065-609c-4ecb-9409-ff9be4c88730" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_3720a675-0736-4bf9-b4bd-f0e1dca4e07f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_2c446065-609c-4ecb-9409-ff9be4c88730" xlink:to="loc_us-gaap_Revenues_3720a675-0736-4bf9-b4bd-f0e1dca4e07f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_1fbe7842-5286-4ac2-ba78-f2022bc16469" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenue"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_2c446065-609c-4ecb-9409-ff9be4c88730" xlink:to="loc_us-gaap_CostOfRevenue_1fbe7842-5286-4ac2-ba78-f2022bc16469" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_2e40fc02-b624-40d3-aba8-56b5eac5cda6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_9b93ec41-b3ca-4061-a284-58aa3efffa46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_2e40fc02-b624-40d3-aba8-56b5eac5cda6" xlink:to="loc_us-gaap_GrossProfit_9b93ec41-b3ca-4061-a284-58aa3efffa46" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_eba51a21-a8e4-444a-9f38-7c10b5acbdd1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_2e40fc02-b624-40d3-aba8-56b5eac5cda6" xlink:to="loc_us-gaap_OperatingExpenses_eba51a21-a8e4-444a-9f38-7c10b5acbdd1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_f9a760a9-b011-4340-84c0-ef93e377b631" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_45b97ffa-0442-492e-8d28-dc91e6b67d57" xlink:href="mwa-20211231.xsd#mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_f9a760a9-b011-4340-84c0-ef93e377b631" xlink:to="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_45b97ffa-0442-492e-8d28-dc91e6b67d57" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_8aed847d-8407-4fb2-a74e-472a2d3dd9b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_f9a760a9-b011-4340-84c0-ef93e377b631" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_8aed847d-8407-4fb2-a74e-472a2d3dd9b5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingExpense_adabc6c4-edc2-42c5-9483-b36f9f8ce01e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNonoperatingExpense"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_f9a760a9-b011-4340-84c0-ef93e377b631" xlink:to="loc_us-gaap_OtherNonoperatingExpense_adabc6c4-edc2-42c5-9483-b36f9f8ce01e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_d9c00571-b7d3-40a0-ace7-cdd131c4dae5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_57f73348-807d-4759-9ab2-538879d70480" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_ce5bd1fa-fe24-47b1-9dc6-3819e8336456" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_57f73348-807d-4759-9ab2-538879d70480" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_ce5bd1fa-fe24-47b1-9dc6-3819e8336456" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_72c0197a-66a3-41eb-99fe-aafa9b177b7b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingExpenses_57f73348-807d-4759-9ab2-538879d70480" xlink:to="loc_us-gaap_RestructuringCharges_72c0197a-66a3-41eb-99fe-aafa9b177b7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_e59d9e3f-8650-4d3b-a1d5-bd0099926336" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_400a67f4-a340-40f7-ad4c-16cd5709d9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d3fee1cb-afe3-4afe-94a2-ffecd6359d1f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_400a67f4-a340-40f7-ad4c-16cd5709d9b8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d3fee1cb-afe3-4afe-94a2-ffecd6359d1f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_b6e67fc3-bf7c-407f-bc0a-5c5b6bb4e8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_400a67f4-a340-40f7-ad4c-16cd5709d9b8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_b6e67fc3-bf7c-407f-bc0a-5c5b6bb4e8b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_160e09d5-41d9-493d-b5c6-5692df0213fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_e541a30e-93ff-49a3-8e74-ae41d9ac4f89" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_160e09d5-41d9-493d-b5c6-5692df0213fb" xlink:to="loc_us-gaap_OperatingIncomeLoss_e541a30e-93ff-49a3-8e74-ae41d9ac4f89" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_d1ad8957-6cd3-4bc2-a1c6-e591f9ccc580" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_160e09d5-41d9-493d-b5c6-5692df0213fb" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_d1ad8957-6cd3-4bc2-a1c6-e591f9ccc580" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.muellerwaterproducts.com/role/ConsolidatedStatementofComprehensiveIncomeStatement" xlink:type="simple" xlink:href="mwa-20211231.xsd#ConsolidatedStatementofComprehensiveIncomeStatement"/>
  <link:calculationLink xlink:role="http://www.muellerwaterproducts.com/role/ConsolidatedStatementofComprehensiveIncomeStatement" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_b5d8c6b1-da10-43c3-91e1-3c1d3e620823" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_15b23903-d193-4ac8-ba2c-8a19317e32b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_b5d8c6b1-da10-43c3-91e1-3c1d3e620823" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_15b23903-d193-4ac8-ba2c-8a19317e32b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_07716fca-7e77-4537-b013-5223172920ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_b5d8c6b1-da10-43c3-91e1-3c1d3e620823" xlink:to="loc_us-gaap_NetIncomeLoss_07716fca-7e77-4537-b013-5223172920ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_00fe479f-98b1-4c55-aaf5-8da3ecb9cf5c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_d1f24cf9-ac1e-4a2b-950c-469d4c02f9eb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_00fe479f-98b1-4c55-aaf5-8da3ecb9cf5c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax_d1f24cf9-ac1e-4a2b-950c-469d4c02f9eb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_65f4ccd1-ef38-4806-b450-776cc2bbea37" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_00fe479f-98b1-4c55-aaf5-8da3ecb9cf5c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax_65f4ccd1-ef38-4806-b450-776cc2bbea37" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_6f330794-64d8-419a-a240-9c12a17e701e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_00fe479f-98b1-4c55-aaf5-8da3ecb9cf5c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_6f330794-64d8-419a-a240-9c12a17e701e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="simple" xlink:href="mwa-20211231.xsd#ConsolidatedStatementsOfCashFlows"/>
  <link:calculationLink xlink:role="http://www.muellerwaterproducts.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_5747c37a-137d-422e-b8d4-872f091fdf7f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_7b17ea59-5582-4c50-b20d-63c72002936f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_5747c37a-137d-422e-b8d4-872f091fdf7f" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_7b17ea59-5582-4c50-b20d-63c72002936f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_7673d356-72cb-4d46-bcf4-9b7b70cf7e6f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_5747c37a-137d-422e-b8d4-872f091fdf7f" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_7673d356-72cb-4d46-bcf4-9b7b70cf7e6f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_93d39e2b-b474-4710-b5d9-447950e64829" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_5747c37a-137d-422e-b8d4-872f091fdf7f" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_93d39e2b-b474-4710-b5d9-447950e64829" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends_5cc82919-5f34-4141-91f9-6ae04b2fa063" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfDividends"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:to="loc_us-gaap_PaymentsOfDividends_5cc82919-5f34-4141-91f9-6ae04b2fa063" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_05f69ebe-473a-495b-a44f-b88afa04e8dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_05f69ebe-473a-495b-a44f-b88afa04e8dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_e0df8545-1fcb-4969-8417-d1f49308075c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_e0df8545-1fcb-4969-8417-d1f49308075c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_95e66e5f-f8c2-4314-aacd-27cba0832dab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_95e66e5f-f8c2-4314-aacd-27cba0832dab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_5ba2b725-cb36-4d08-b138-c54f98bd8c08" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_5ba2b725-cb36-4d08-b138-c54f98bd8c08" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromOtherEquity_b1b13c46-0cf7-4d89-9698-06f3d8df7b95" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromOtherEquity"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:to="loc_us-gaap_ProceedsFromOtherEquity_b1b13c46-0cf7-4d89-9698-06f3d8df7b95" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_3cd85ed2-c789-41b4-b40f-88837860658e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_13f7d97a-ab8e-48f8-9460-7d857c6efa6c" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_3cd85ed2-c789-41b4-b40f-88837860658e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWriteDown_6cdd01a6-67b3-456f-94ec-cd3b74c8c1d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryWriteDown"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_InventoryWriteDown_6cdd01a6-67b3-456f-94ec-cd3b74c8c1d8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_bef6a1fe-3f67-4497-8ae4-ddb5519a8eff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Depreciation"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_Depreciation_bef6a1fe-3f67-4497-8ae4-ddb5519a8eff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_2b59ebdf-9735-4694-b9b8-123bf6e59706" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_2b59ebdf-9735-4694-b9b8-123bf6e59706" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_78f934fa-38cc-4ad2-a0ab-025455e43951" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_78f934fa-38cc-4ad2-a0ab-025455e43951" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_822ca826-ce0a-4e42-943b-60d0b0f9ca10" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_822ca826-ce0a-4e42-943b-60d0b0f9ca10" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_ee26f6da-d3d5-447a-a5ee-e27752b610f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_ee26f6da-d3d5-447a-a5ee-e27752b610f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_4a6a8dcd-c721-4ca9-8be8-eb78b1e9214c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_4a6a8dcd-c721-4ca9-8be8-eb78b1e9214c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_07922290-2069-4ade-945d-880b6b0fe86e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_07922290-2069-4ade-945d-880b6b0fe86e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_93552c03-f1f5-44a2-a6e3-3fc20ea90ffe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_ShareBasedCompensation_93552c03-f1f5-44a2-a6e3-3fc20ea90ffe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitExpense_8480f0fc-0aea-45d7-8999-fc6ed3b8e547" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitExpense"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitExpense_8480f0fc-0aea-45d7-8999-fc6ed3b8e547" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_0c7c8cba-e624-49cc-a0ed-8130efcb3ea9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_0c7c8cba-e624-49cc-a0ed-8130efcb3ea9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_2eeac0ef-c2dc-4efc-b7ab-877ab8920ba3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_NetIncomeLoss_2eeac0ef-c2dc-4efc-b7ab-877ab8920ba3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_0e542b3d-e0eb-4446-8ce3-1e2afd9fdc7a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_AdjustmentForAmortization_0e542b3d-e0eb-4446-8ce3-1e2afd9fdc7a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_addb47b0-40fa-4a76-91b8-06750e24523e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="14" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_499f2f8b-5463-49ee-9974-d0726d679529" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_addb47b0-40fa-4a76-91b8-06750e24523e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_147f3f26-8ac9-42b8-bab8-815747675af4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_47717b0f-9cda-4045-8851-cbb13a07f692" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_147f3f26-8ac9-42b8-bab8-815747675af4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_47717b0f-9cda-4045-8851-cbb13a07f692" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_69018a87-f446-446b-b7ff-04b823302ad4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_147f3f26-8ac9-42b8-bab8-815747675af4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_69018a87-f446-446b-b7ff-04b823302ad4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_6863a302-d8e5-4c5b-a64f-5445770210cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_147f3f26-8ac9-42b8-bab8-815747675af4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_6863a302-d8e5-4c5b-a64f-5445770210cc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_4e419946-ecad-45a4-a5b5-303e965505c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_147f3f26-8ac9-42b8-bab8-815747675af4" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_4e419946-ecad-45a4-a5b5-303e965505c5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.muellerwaterproducts.com/role/RevenuefromContractswithCustomersDetails" xlink:type="simple" xlink:href="mwa-20211231.xsd#RevenuefromContractswithCustomersDetails"/>
  <link:calculationLink xlink:role="http://www.muellerwaterproducts.com/role/RevenuefromContractswithCustomersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_450eaa02-7430-4c0b-b2bd-936e8008cb62" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_394089e0-97b2-46b8-9c17-2a4bb157562e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_450eaa02-7430-4c0b-b2bd-936e8008cb62" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_394089e0-97b2-46b8-9c17-2a4bb157562e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_af7da717-a906-4de2-a706-9663c69623b3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_450eaa02-7430-4c0b-b2bd-936e8008cb62" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_af7da717-a906-4de2-a706-9663c69623b3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_e5c22d7c-8e6b-427b-b30a-8943a4fbddcf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BilledContractReceivables_58f288df-82ac-40aa-9c39-16b22b62f549" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BilledContractReceivables"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableGrossCurrent_e5c22d7c-8e6b-427b-b30a-8943a4fbddcf" xlink:to="loc_us-gaap_BilledContractReceivables_58f288df-82ac-40aa-9c39-16b22b62f549" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnbilledReceivablesCurrent_c008761e-efb5-4230-a491-87b5bb6b3186" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnbilledReceivablesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableGrossCurrent_e5c22d7c-8e6b-427b-b30a-8943a4fbddcf" xlink:to="loc_us-gaap_UnbilledReceivablesCurrent_c008761e-efb5-4230-a491-87b5bb6b3186" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.muellerwaterproducts.com/role/RetirementPlansNetPeriodicBenefitCostDetails" xlink:type="simple" xlink:href="mwa-20211231.xsd#RetirementPlansNetPeriodicBenefitCostDetails"/>
  <link:calculationLink xlink:role="http://www.muellerwaterproducts.com/role/RetirementPlansNetPeriodicBenefitCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_3358ce5b-0416-4987-9957-573f0e61018e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_a65b7374-22eb-468a-906f-4490d46b3f42" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_3358ce5b-0416-4987-9957-573f0e61018e" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_a65b7374-22eb-468a-906f-4490d46b3f42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_59201844-5f14-4c9b-bc11-2b8c9bbb9893" xlink:href="mwa-20211231.xsd#mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_3358ce5b-0416-4987-9957-573f0e61018e" xlink:to="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_59201844-5f14-4c9b-bc11-2b8c9bbb9893" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_07943e19-a909-43b9-b339-c4364ef01df6" xlink:href="mwa-20211231.xsd#mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_4b22054d-cda5-4417-9371-d290b4d3671b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_07943e19-a909-43b9-b339-c4364ef01df6" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_4b22054d-cda5-4417-9371-d290b4d3671b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_88abce7f-f63f-4d29-bbc3-652b8bb44a52" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_07943e19-a909-43b9-b339-c4364ef01df6" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_88abce7f-f63f-4d29-bbc3-652b8bb44a52" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_e3002789-8d58-41f2-a2ab-1dbf99dff69b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_mwa_DefinedBenefitPlanNetPeriodicBenefitCostotherthanServiceCost_07943e19-a909-43b9-b339-c4364ef01df6" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_e3002789-8d58-41f2-a2ab-1dbf99dff69b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationScheduleOfSelectedSupplementalBalanceSheetInformationDetails" xlink:type="simple" xlink:href="mwa-20211231.xsd#SupplementalBalanceSheetInformationScheduleOfSelectedSupplementalBalanceSheetInformationDetails"/>
  <link:calculationLink xlink:role="http://www.muellerwaterproducts.com/role/SupplementalBalanceSheetInformationScheduleOfSelectedSupplementalBalanceSheetInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_99380cbc-59cf-4c08-a5bd-15d69e868b19" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Land_bbcfc867-822c-466d-85f2-2ff108bf12ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Land"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_99380cbc-59cf-4c08-a5bd-15d69e868b19" xlink:to="loc_us-gaap_Land_bbcfc867-822c-466d-85f2-2ff108bf12ab" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_214c20d5-3974-4780-affa-3080a3596000" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingsAndImprovementsGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_99380cbc-59cf-4c08-a5bd-15d69e868b19" xlink:to="loc_us-gaap_BuildingsAndImprovementsGross_214c20d5-3974-4780-affa-3080a3596000" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_5f424650-fc34-47a9-87e6-379496830105" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MachineryAndEquipmentGross"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_99380cbc-59cf-4c08-a5bd-15d69e868b19" xlink:to="loc_us-gaap_MachineryAndEquipmentGross_5f424650-fc34-47a9-87e6-379496830105" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressGross_de15467a-17cb-4f3e-a19b-df8214a0b07e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConstructionInProgressGross"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentGross_99380cbc-59cf-4c08-a5bd-15d69e868b19" xlink:to="loc_us-gaap_ConstructionInProgressGross_de15467a-17cb-4f3e-a19b-df8214a0b07e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_eed7da49-a93c-4ba4-95be-55d51bd9e4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_75a2e1d6-a5bb-436d-b48e-99448f4fdcd7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_eed7da49-a93c-4ba4-95be-55d51bd9e4b9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_75a2e1d6-a5bb-436d-b48e-99448f4fdcd7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_a12d00ce-81a5-4a6d-9ac4-3ca64ccd087e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_eed7da49-a93c-4ba4-95be-55d51bd9e4b9" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_a12d00ce-81a5-4a6d-9ac4-3ca64ccd087e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_7ea8f71e-2898-4cef-9502-f44dbd0a2c8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_cac29804-f5a5-4b91-9f5b-4e2462ae19ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_7ea8f71e-2898-4cef-9502-f44dbd0a2c8d" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_cac29804-f5a5-4b91-9f5b-4e2462ae19ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves_f0a9bc6f-db67-4dc9-b239-1c045fdb24fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_7ea8f71e-2898-4cef-9502-f44dbd0a2c8d" xlink:to="loc_us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves_f0a9bc6f-db67-4dc9-b239-1c045fdb24fd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_4e564332-ec41-4449-88f6-70ce00960146" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_7ea8f71e-2898-4cef-9502-f44dbd0a2c8d" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_4e564332-ec41-4449-88f6-70ce00960146" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a7e492ff-e08a-4250-9bc4-fd46d91f9e70" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_70420b5d-61d1-49ec-8419-fa205ce8f4c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a7e492ff-e08a-4250-9bc4-fd46d91f9e70" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_70420b5d-61d1-49ec-8419-fa205ce8f4c9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_6e19b82d-e6ff-4e4c-9170-a4f27a8f4775" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCash"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a7e492ff-e08a-4250-9bc4-fd46d91f9e70" xlink:to="loc_us-gaap_RestrictedCash_6e19b82d-e6ff-4e4c-9170-a4f27a8f4775" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEmployeeBenefitsCurrent_dfade057-78aa-48e2-b31b-e580b7ef3394" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedEmployeeBenefitsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_AccruedEmployeeBenefitsCurrent_dfade057-78aa-48e2-b31b-e580b7ef3394" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_AccruedRebate_4526b9ec-fa24-42fc-b209-e48683b1d91a" xlink:href="mwa-20211231.xsd#mwa_AccruedRebate"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_mwa_AccruedRebate_4526b9ec-fa24-42fc-b209-e48683b1d91a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_894c7ce2-f630-4def-a89a-5c1a33ce560b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_894c7ce2-f630-4def-a89a-5c1a33ce560b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyAccrual_3846d530-1f76-4d3a-950e-2e3b8e1d7de3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductWarrantyAccrual"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_ProductWarrantyAccrual_3846d530-1f76-4d3a-950e-2e3b8e1d7de3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenue_27c549ae-027f-4e04-b1b0-31148320ce00" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredRevenue"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_DeferredRevenue_27c549ae-027f-4e04-b1b0-31148320ce00" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRefundLiabilityCurrent_8bc77d8b-3392-44b5-9be7-2da250ef1082" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRefundLiabilityCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_CustomerRefundLiabilityCurrent_8bc77d8b-3392-44b5-9be7-2da250ef1082" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_77760bfc-9b96-441f-96c8-ff6f165e00d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_77760bfc-9b96-441f-96c8-ff6f165e00d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxes_6ded1127-aa29-4404-8c62-5f7ac6f8d830" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedIncomeTaxes"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_AccruedIncomeTaxes_6ded1127-aa29-4404-8c62-5f7ac6f8d830" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationReserveCurrent_43601f9f-7a92-48fd-b742-e27baea17b19" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LitigationReserveCurrent"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_LitigationReserveCurrent_43601f9f-7a92-48fd-b742-e27baea17b19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_f816d761-7024-4ac4-923a-4dfcfa29f590" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_f816d761-7024-4ac4-923a-4dfcfa29f590" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_CARESActDeferralCurrentPortion_33c1bb89-cc2e-4684-a83a-6f03ba6d7a42" xlink:href="mwa-20211231.xsd#mwa_CARESActDeferralCurrentPortion"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_mwa_CARESActDeferralCurrentPortion_33c1bb89-cc2e-4684-a83a-6f03ba6d7a42" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_272bb710-705e-467e-9070-98c9383e22d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedEnvironmentalLossContingenciesCurrent"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_272bb710-705e-467e-9070-98c9383e22d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent_3e827f8d-4b41-480a-b209-df375b6eecca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent_3e827f8d-4b41-480a-b209-df375b6eecca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveCurrent_814f177a-e43e-4f45-b00e-7fd51dacde87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestructuringReserveCurrent"/>
    <link:calculationArc order="14" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccruedLiabilitiesCurrent_7f2d59bd-ccc0-49ad-8b8a-5293fa4d150f" xlink:to="loc_us-gaap_RestructuringReserveCurrent_814f177a-e43e-4f45-b00e-7fd51dacde87" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_1b6df932-41f7-4d26-bdf5-f85796256260" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_1b6df932-41f7-4d26-bdf5-f85796256260" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_UsMaintenanceRepairAndToolingSupplies_c270ce2c-8aa7-477b-9de6-88ea0234b45b" xlink:href="mwa-20211231.xsd#mwa_UsMaintenanceRepairAndToolingSupplies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:to="loc_mwa_UsMaintenanceRepairAndToolingSupplies_c270ce2c-8aa7-477b-9de6-88ea0234b45b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NontradeReceivablesNoncurrent_c005ef3a-026c-4a14-8eb2-45c1f5c5c1cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NontradeReceivablesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:to="loc_us-gaap_NontradeReceivablesNoncurrent_c005ef3a-026c-4a14-8eb2-45c1f5c5c1cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_8d340ba5-fce0-40d5-bb71-07c56bcdaf93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_8d340ba5-fce0-40d5-bb71-07c56bcdaf93" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_e70e598f-4644-44c6-9a13-8a0ca1111208" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_e70e598f-4644-44c6-9a13-8a0ca1111208" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_e201798b-5757-4e2e-a3f2-72effde5e50f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:to="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_e201798b-5757-4e2e-a3f2-72effde5e50f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_ecbc3809-67d8-43b8-89e5-f52353368399" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesReceivableRelatedPartiesNoncurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsNoncurrent_aa1f3986-50c4-4b5d-a74b-9101d7af2bb1" xlink:to="loc_us-gaap_NotesReceivableRelatedPartiesNoncurrent_ecbc3809-67d8-43b8-89e5-f52353368399" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3f64e351-2356-49b4-a09b-7e11ee8e5728" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3f64e351-2356-49b4-a09b-7e11ee8e5728" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandardProductWarrantyAccrualNoncurrent_2cf7205f-0371-41f8-851b-f78d562c783b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StandardProductWarrantyAccrualNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_us-gaap_StandardProductWarrantyAccrualNoncurrent_2cf7205f-0371-41f8-851b-f78d562c783b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_TransitionTaxLiability_7503c8ef-a3fb-42b5-aee0-69037f644e29" xlink:href="mwa-20211231.xsd#mwa_TransitionTaxLiability"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_mwa_TransitionTaxLiability_7503c8ef-a3fb-42b5-aee0-69037f644e29" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_af24366a-7905-46ef-8aca-ca0e55b54405" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_af24366a-7905-46ef-8aca-ca0e55b54405" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WorkersCompensationLiabilityNoncurrent_bcb7cbcc-0189-4288-8bb5-c48614f77687" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WorkersCompensationLiabilityNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_us-gaap_WorkersCompensationLiabilityNoncurrent_bcb7cbcc-0189-4288-8bb5-c48614f77687" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_NewMarketTaxCreditLiabilities_3f98d212-1fcd-46ad-b65e-895799501aac" xlink:href="mwa-20211231.xsd#mwa_NewMarketTaxCreditLiabilities"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_mwa_NewMarketTaxCreditLiabilities_3f98d212-1fcd-46ad-b65e-895799501aac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_GrantYetToBeEarned_766828f4-1119-447c-b9aa-9d8794f0dcb5" xlink:href="mwa-20211231.xsd#mwa_GrantYetToBeEarned"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_mwa_GrantYetToBeEarned_766828f4-1119-447c-b9aa-9d8794f0dcb5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_a2093b6b-308a-4b36-83a6-a049d17c2339" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAccruedLiabilitiesNoncurrent"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_a2093b6b-308a-4b36-83a6-a049d17c2339" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_mwa_CARESActDeferrals_ac12d9d8-25b2-4cbc-be89-af69b98c1009" xlink:href="mwa-20211231.xsd#mwa_CARESActDeferrals"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_mwa_CARESActDeferrals_ac12d9d8-25b2-4cbc-be89-af69b98c1009" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetRetirementObligation_952c18f0-8a25-4a49-a7f8-c0b61efcfb40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetRetirementObligation"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_90f67356-2195-4f6b-a463-8845b67c4da8" xlink:to="loc_us-gaap_AssetRetirementObligation_952c18f0-8a25-4a49-a7f8-c0b61efcfb40" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_785afe68-bcde-4e22-bf8d-14e5b5f8d873" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialsSuppliesAndOther_c331ea45-e75c-40c3-a6b1-5641c4d0a192" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MaterialsSuppliesAndOther"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_785afe68-bcde-4e22-bf8d-14e5b5f8d873" xlink:to="loc_us-gaap_MaterialsSuppliesAndOther_c331ea45-e75c-40c3-a6b1-5641c4d0a192" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivable_8c297e10-6dcb-422f-830e-30bb580a9adf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesReceivable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_785afe68-bcde-4e22-bf8d-14e5b5f8d873" xlink:to="loc_us-gaap_IncomeTaxesReceivable_8c297e10-6dcb-422f-830e-30bb580a9adf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPrepaidExpenseCurrent_3944d888-5388-4d4b-9168-a06da6ab956d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherPrepaidExpenseCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_785afe68-bcde-4e22-bf8d-14e5b5f8d873" xlink:to="loc_us-gaap_OtherPrepaidExpenseCurrent_3944d888-5388-4d4b-9168-a06da6ab956d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NontradeReceivables_020abe2e-cf8c-4a8e-8964-65570299346e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NontradeReceivables"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_785afe68-bcde-4e22-bf8d-14e5b5f8d873" xlink:to="loc_us-gaap_NontradeReceivables_020abe2e-cf8c-4a8e-8964-65570299346e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrentAndNoncurrent_ee0fe106-9b19-4c9c-b4b7-dbff05dc6d68" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseCurrentAndNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_785afe68-bcde-4e22-bf8d-14e5b5f8d873" xlink:to="loc_us-gaap_PrepaidExpenseCurrentAndNoncurrent_ee0fe106-9b19-4c9c-b4b7-dbff05dc6d68" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivables_9d38a46f-42d0-4dc8-89c4-e27bfea7dda5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherReceivables"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherAssetsCurrent_785afe68-bcde-4e22-bf8d-14e5b5f8d873" xlink:to="loc_us-gaap_OtherReceivables_9d38a46f-42d0-4dc8-89c4-e27bfea7dda5" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
