-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 RXI/de+TfbBZFjRC5CrOpqwh6MxS5PR8yf2/ggpeij3aftzCE8P9N2LFyOXgtZTO
 jcSe3WsEp71qdHCs+/mBPQ==

<SEC-DOCUMENT>0001181431-10-048237.txt : 20100928
<SEC-HEADER>0001181431-10-048237.hdr.sgml : 20100928
<ACCEPTANCE-DATETIME>20100928191423
ACCESSION NUMBER:		0001181431-10-048237
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20100924
FILED AS OF DATE:		20100928
DATE AS OF CHANGE:		20100928

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Stoll Mark R
		CENTRAL INDEX KEY:			0001402215

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32342
		FILM NUMBER:		101094828

	MAIL ADDRESS:	
		STREET 1:		1601 WEST DIEHL ROAD
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60563-1198

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Nalco Holding CO
		CENTRAL INDEX KEY:			0001298341
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS CHEMICAL PRODUCTS [2890]
		IRS NUMBER:				161701300
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1601 WEST DIEHL ROAD
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60563
		BUSINESS PHONE:		(630) 305-1000

	MAIL ADDRESS:	
		STREET 1:		1601 WEST DIEHL ROAD
		CITY:			NAPERVILLE
		STATE:			IL
		ZIP:			60563

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Nalco CORP
		DATE OF NAME CHANGE:	20040723
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd287209.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-09-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001298341</issuerCik>
        <issuerName>Nalco Holding CO</issuerName>
        <issuerTradingSymbol>NLC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001402215</rptOwnerCik>
            <rptOwnerName>Stoll Mark R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1601 WEST DIEHL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NAPERVILLE</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60563-1198</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-09-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>25.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>54596</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <ownerSignature>
        <signatureName>/s/ Anne Marie Morris, as attorney in fact</signatureName>
        <signatureDate>2010-09-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----