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REVENUE RECOGNITION, Disaggregated Revenues (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) Contract | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
REVENUE RECOGNITION [Abstract] |  |  |
Minimum number of days due for accounts receivable from tariff contract customers | 25 days |  |
Reserve or reduction to revenue | $ 0 | $ 0 |
Minimum number of days due for accounts receivable from SLP Plan customer | 25 days |  |
Minimum number of days customers services invoiced in advance | 30 days |  |
Number of operation contracts paid in advance | Contract | 1 |  |
Disaggregation of Revenue [Abstract] |  |  |
Other Operating Revenue not in scope of ASC 606 | $ 1,767 | 1,591 | $ 1,881
Revenue from acquisition | 107,952 | 98,861 | 98,897
Tariff Revenue [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 98,841 | 89,987 | 87,424
Tariff Revenue [Member] | Consumption Charges [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 58,477 | 49,051 | 47,809
Tariff Revenue [Member] | Fixed Fees [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 36,825 | 33,074 | 31,431
Tariff Revenue [Member] | Service Charges [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 735 | 682 | 597
Tariff Revenue [Member] | DSIC [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 136 | 4,727 | 5,085
Tariff Revenue [Member] | Metered Wastewater Services [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 809 | 602 | 649
Tariff Revenue [Member] | Industrial Wastewater Services [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 1,859 | 1,851 | 1,853
Non-Tariff Revenue [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 7,344 | 7,283 | 9,592
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 5,825 | 5,632 | 5,020
Non-Tariff Revenue [Member] | Contract Operations [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 1,047 | 1,046 | 931
Non-Tariff Revenue [Member] | Design and Installation [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | 62 | 181 | 3,315
Non-Tariff Revenue [Member] | Inspection Fees [Member] |  |  |
Disaggregation of Revenue [Abstract] |  |  |
Revenue from acquisition | $ 410 | $ 424 | $ 326

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