<SUBMISSION>
<ACCESSION-NUMBER>0001204127-05-000017
<TYPE>5
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20041231
<FILING-DATE>20050207
<DATE-OF-FILING-DATE-CHANGE>20050207
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>ADA-ES INC
<CIK>0001223112
<ASSIGNED-SIC>2890
<IRS-NUMBER>841457335
<STATE-OF-INCORPORATION>CO
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<MAIL-ADDRESS>
<STREET1>8100 SOUTHPARK WAY B
<CITY>LITTLETON
<STATE>CO
<ZIP>80120
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>LOWDERMILK ROBERT H
<CIK>0001249576
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>5
<ACT>34
<FILE-NUMBER>000-50216
<FILM-NUMBER>05579541
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>8100 SOUTHPARK WAY
<STREET2>SUITE B
<CITY>LITTLETON
<STATE>CO
<ZIP>801204525
<PHONE>3037341727
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>8100 SOUTHPARK WAY
<STREET2>SUITE B
<CITY>LITTLETON
<STATE>CO
<ZIP>80120452
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2004-12-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0001223112</issuerCik>
        <issuerName>ADA-ES INC</issuerName>
        <issuerTradingSymbol>ADES</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001249576</rptOwnerCik>
            <rptOwnerName>LOWDERMILK ROBERT H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>8100 SOUTHPARK WAY</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE B</rptOwnerStreet2>
            <rptOwnerCity>LITTLETON</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80120452</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock, no par value</value>
            </securityTitle>
            <transactionCoding>
                <transactionFormType></transactionFormType>
            </transactionCoding>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>74335</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock, no par value</value>
            </securityTitle>
            <transactionCoding>
                <transactionFormType></transactionFormType>
            </transactionCoding>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>109000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Owned by Tectonic Construction Company.</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Included in the amount shown are 13,000 shares registered in the name of Mr. Lowdermilk's wife, 500 shares registered jointly to Mr. Lowdermilk and his wife and 666 shares registered in the name of Mr. Lowdermilk as custodian for Jared Alexander Lowdermilk, UTMA.</footnote>
        <footnote id="F2">Mr. Lowdermilk is the President of Tectonic Construction Company.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Robert H Lowdermilk</signatureName>
        <signatureDate>2005-02-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
