<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0407</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-07-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000727273</issuerCik>
        <issuerName>CADIZ INC</issuerName>
        <issuerTradingSymbol>CDZI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001782759</rptOwnerCik>
            <rptOwnerName>Webb de Macias Carolyn D</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CADIZ INC.</rptOwnerStreet1>
            <rptOwnerStreet2>550 SOUTH HOPE STREET, SUITE 2850</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2023-07-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5666</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>4.4124</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25641</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares allocated to the Reporting Person under the 2019 Equity Incentive Plan for services rendered by the Reporting Person as a director of the Issuer for the 12-month period ended June 30, 2023, which shares will vest on January 31, 2024.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Carolyn Webb de Macias</signatureName>
        <signatureDate>2023-07-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
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X0407
4
2023-07-03
0
0000727273
CADIZ INC
CDZI
0001782759
Webb de Macias Carolyn D
C/O CADIZ INC.
550 SOUTH HOPE STREET, SUITE 2850
LOS ANGELES
CA
90071
1
0
0
0
0
Common Stock
2023-07-03
4
A
0
5666
4.4124
A
25641
D
Shares allocated to the Reporting Person under the 2019 Equity Incentive Plan for services rendered by the Reporting Person as a director of the Issuer for the 12-month period ended June 30, 2023, which shares will vest on January 31, 2024.
Carolyn Webb de Macias
2023-07-06