<SEC-DOCUMENT>0001621832-20-000023.txt : 20200109
<SEC-HEADER>0001621832-20-000023.hdr.sgml : 20200109
<ACCEPTANCE-DATETIME>20200109190357
ACCESSION NUMBER:		0001621832-20-000023
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20200107
FILED AS OF DATE:		20200109
DATE AS OF CHANGE:		20200109

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Merrill Judd
		CENTRAL INDEX KEY:			0001652660

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37515
		FILM NUMBER:		20519183

	MAIL ADDRESS:	
		STREET 1:		2425 CROOKED CANYON CT.
		CITY:			RENO
		STATE:			NV
		ZIP:			89521

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Aqua Metals, Inc.
		CENTRAL INDEX KEY:			0001621832
		STANDARD INDUSTRIAL CLASSIFICATION:	SECONDARY SMELTING & REFINING OF NONFERROUS METALS [3341]
		IRS NUMBER:				471169572
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2500 PERU DR.
		CITY:			MCCARRAN
		STATE:			NV
		ZIP:			89437
		BUSINESS PHONE:		(775) 525-1936

	MAIL ADDRESS:	
		STREET 1:		2500 PERU DR.
		CITY:			MCCARRAN
		STATE:			NV
		ZIP:			89437
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_157861461999758.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-01-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001621832</issuerCik>
        <issuerName>Aqua Metals, Inc.</issuerName>
        <issuerTradingSymbol>AQMS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001652660</rptOwnerCik>
            <rptOwnerName>Merrill Judd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2500 PERU DR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SPARKS</rptOwnerCity>
            <rptOwnerState>NV</rptOwnerState>
            <rptOwnerZipCode>89437</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2020-01-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>619</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.80</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>275872</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the issuance of stock units. Sell was conducted by the Reporting Person in connection to reimburse the company to cover the company's tax withholding requirement triggered by the issuance of the shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Judd Merrill</signatureName>
        <signatureDate>2020-01-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
