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<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-05-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001434728</issuerCik>
        <issuerName>Global Water Resources, Inc.</issuerName>
        <issuerTradingSymbol>GWRS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001673005</rptOwnerCik>
            <rptOwnerName>Fleming Ronnie L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GLOBAL WATER RESOURCES, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>21410 N 19TH AVENUE #220</rptOwnerStreet2>
            <rptOwnerCity>PHOENIX</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85027</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Remarks</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Common Stock</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>9796</value>
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                <transactionPricePerShare>
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                    <value>D</value>
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    <derivativeTable>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>92500</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2023-06-30</value>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>92500</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                    <value>92500</value>
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                <value>Stock Appreciation Right</value>
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                <footnoteId id="F3"/>
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                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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                <transactionShares>
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                <transactionAcquiredDisposedCode>
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            <exerciseDate>
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            <expirationDate>
                <value>2025-05-07</value>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>180000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                    <value>180000</value>
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        <derivativeTransaction>
            <securityTitle>
                <value>Phantom Stock Unit</value>
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                <value>2016-05-03</value>
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                <footnoteId id="F5"/>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>29396</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
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                <transactionPricePerShare>
                    <value>0.00</value>
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                <transactionAcquiredDisposedCode>
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                <footnoteId id="F4"/>
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            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>29396</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>29396</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">On May 3, 2016, Global Water Resources, Inc. (the &quot;Company&quot;) completed its merger (the &quot;Merger&quot;) with GWR Global Water Resources Corp. (&quot;GWRC&quot;) pursuant to which GWRC merged with and into the Company, with the Company surviving as a Delaware corporation.  Holders of GWRC's common shares received one share of the Company's common stock for each then outstanding common share of GWRC.  As a result, the reporting person received 9,796 shares of the Company's common stock for the 9,796 common shares of GWRC held by the reporting person prior to the consummation of the Merger.</footnote>
        <footnote id="F2">The stock appreciation rights were originally granted on July 1, 2013 (the &quot;2013 SARs&quot;) and vest ratably over 16 quarters from the grant date. As of the date of this report, 61,250 of the 2013 SARs are immediately exercisable.  The 2013 SARs originally provided the reporting person the right to receive a cash payment equal to the difference between CAD$2.00 per share and the closing price of GWRC's common shares on the exercise date, provided that the closing price was in excess of CAD$2.00 per share.  Upon consummation of the Merger, the 2013 SARs were amended such that (i) the exercise price of the 2013 SARs was converted to U.S. dollars and (ii) the value of the 2013 SARs track the performance of the Company's common stock going forward.</footnote>
        <footnote id="F3">The stock appreciation rights were originally granted on May 8, 2015 (the &quot;2015 SARs&quot;) and vest in 20% installments on April 1 of each of the first three (3) years following the grant date, with the first installment having vested on April 1, 2016, and a final 40% installment vesting on the fourth (4th) anniversary of the grant date. As of the date of this report, 36,000 of the 2015 SARs are immediately exercisable.  The 2015 SARs originally provided the reporting person the right to receive a cash payment equal to the difference between CAD$6.44 per share and the closing price of GWRC's common shares on the exercise date, provided that the closing price was in excess of CAD$6.44 per share.  Upon consummation of the Merger, the 2015 SARs were amended such that (i) the exercise price of the 2015 SARs was converted to U.S. dollars and (ii) the value of the 2015 SARs track the performance of the Company's common stock going forward.</footnote>
        <footnote id="F4">Consists of (i) 448 phantom stock units (the &quot;PSUs&quot;) originally granted on December 31, 2013, which vest ratably over 12 quarters from the grant date (approximately 149 PSUs per quarter); (ii) 9,095 PSUs originally granted on December 31, 2014, which vest ratably over 12 quarters from the grant date (approximately 1,299 PSUs per quarter); (iii) 19,756 PSUs originally granted on December 31, 2015, which vest ratably over 12 quarters from the grant date (approximately 1,796 PSUs per quarter) and (iv) 97 PSUs originally granted on April 29, 2016, which vested immediately.</footnote>
        <footnote id="F5">(Continued from footnote 4) The PSUs are exercisable upon vesting and do not have a set expiration date.  The value of the PSUs originally tracked the performance of GWRC's common shares and provided the reporting person the right to receive a cash payment, the value of which, on a particular date, was to be the market value of the equivalent number of GWRC common shares at that date.  Upon consummation of the Merger, the PSUs were amended such that the value of the PSUs track the performance of the Company's common stock going forward.</footnote>
    </footnotes>

    <remarks>President and Chief Executive Officer</remarks>

    <ownerSignature>
        <signatureName>/s/ Joanne Ellsworth, attorney-in-fact</signatureName>
        <signatureDate>2016-05-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
