Document:

Joinder Agreement, dated as of October 5, 2010

 Exhibit 10.1 

JOINDER AGREEMENT, dated as of October 5, 2010 (this “Joinder Agreement”) by and among BANK OF AMERICA, N.A., in
its capacity as administrative agent under the credit agreement referred to below, NALCO HOLDINGS LLC, a Delaware limited liability company (“Holdings”), NALCO COMPANY, a Delaware corporation ( “Nalco” or the
“U.S. Borrower”), and the Persons listed on Schedule 1 hereto. 
 WHEREAS, reference is made to that certain
credit agreement dated as of May 13, 2009 (as amended, the “Credit Agreement”) among Holdings, the U.S. Borrower, the foreign subsidiary borrowers from time to time party thereto, the lenders party thereto from time to time,
Bank of America, N.A., as administrative agent (in such capacity, the “Administrative Agent”) and as collateral agent for the Lenders, and the arrangers and bookmanagers party thereto. 

WHEREAS, Section 2.22 of the Credit Agreement permits the Borrower to request New Term Commitments from time to time on the terms
and conditions specified therein. 
 WHEREAS, the Borrower has requested the establishment of New Term Commitments in an
aggregate principal amount of $650.0 million (such New Term Commitments, the “Tranche B-1 Term Commitments”). 

WHEREAS, the proceeds of the New Term Loans made pursuant to the Tranche B-1 Term Commitments shall be used as set forth below.

 WHEREAS, each of the Persons set forth on Schedule 1 hereto is, on the terms and subject to the conditions set forth herein,
willing to become a New Term Lender with respect to the Tranche B-1 Term Loans (the “Tranche B-1 Lenders”), with each such Tranche B-1 Lender having a Tranche B-1 Term Commitment in the amount set forth opposite its name on such
Schedule 1. 
 NOW, THEREFORE, in consideration of the mutual agreements herein contained and other good and valuable
consideration, the sufficiency and receipt of which are hereby acknowledged, the parties hereto agree as follows: 
  

	 	A.	Making of Tranche B-1 Term Loans. 

1. Capitalized terms used but not defined in this Joinder Agreement have the meanings assigned thereto in the Credit Agreement. The
provisions of Section 1.02 of the Credit Agreement are hereby incorporated by reference herein, mutatis mutandis. This Joinder Agreement is an “Increase Joinder” referred to in Section 2.22(b) of the Credit Agreement.

 2. Except as set forth in this Joinder Agreement, the terms and provisions of the Tranche B-1 Term Commitments and Tranche
B-1 Term Loans (as defined below) shall be identical to the Term Loans made pursuant to Section 2.01(a) of the Credit Agreement (the “Initial Term Loans” and, for the avoidance of doubt, the Initial Term Loans excludes the
Tranche C Term Loans provided pursuant to the Joinder Agreement dated December 7, 2009 (the “Tranche C Term Loans”) prior to their repayment hereunder and shall otherwise be subject to the provisions of the Credit Agreement and
the other Loan Documents. For the avoidance of doubt, except as expressly provided otherwise herein, the Tranche B-1 Term Commitments, the Tranche B-1 Term Loans and the Tranche B-1 Lenders shall be treated as New Term Commitments, New

 
Term Loans and New Term Lenders, respectively, for purposes of the Credit Agreement and the other Loan Documents; provided that Tranche B-1 Term Commitments, Tranche B-1 Term Loans and
Tranche B-1 Lenders may be designated as such (instead of as New Term Commitments, New Term Loans and New Term Lenders, respectively) on any documentation relating thereto. 

3. Subject to the terms and conditions set forth herein (including, without limitation, the satisfaction of the conditions set forth in
Section D below and the provisions of Section A6 below) and in the Credit Agreement, each Tranche B-1 Lender severally agrees to make to the U.S. Borrower, on a date specified by the U.S. Borrower in the Borrowing Request referred to in Section D
below (the “Tranche B-1 Closing Date”), a single loan to the U.S. Borrower denominated in Dollars in an aggregate principal amount equal to such Tranche B-1 Lender’s Tranche B-1 Term Commitment (a “Tranche B-1 Term
Loan”). 
 4. The U.S. Borrower agrees to pay on the Tranche B-1 Closing Date to each Tranche B-1 Lender, as fee
compensation for the funding of such Tranche B-1 Lender’s Tranche B-1 Term Loan, a closing fee (the “Tranche B-1 Closing Fee”) in an amount equal to 0.50% of the stated principal amount of such Tranche B-1 Lender’s Tranche
B-1 Term Commitment. Such Tranche B-1 Closing Fee will be in all respects fully earned, due and payable on the Tranche B-1 Closing Date and non-refundable and non-creditable thereafter and such Tranche B-1 Closing Fee shall be paid by the U.S.
Borrower to the Tranche B-1 Lender on the Tranche B-1 Closing Date. 
 5. Each Tranche B-1 Lender hereby consents to the
amendments to (x) the Credit Agreement set forth in Section 1 of Amendment No. 3 to the Credit Agreement (“Amendment No. 3”) attached hereto as Exhibit A and (y) the U.S. Collateral Agreement set forth in
Section 2 of Amendment No. 3. 
 6. If not drawn before 5:00 p.m., New York City time on October 12, 2010,
the Tranche B-1 Term Commitments shall expire at such time and shall from and after such time be of no further force or effect. The Tranche B-1 Term Commitment of each Tranche B-1 Lender shall automatically terminate upon the making of the
Tranche B-1 Term Loan relating to such Tranche B-1 Term Commitment. 
  

	 	B.	Terms of the Tranche B-1 Term Loans. 

1. The Tranche B-1 Term Loans shall mature on October 5, 2017 (the “Tranche B-1 Maturity Date”). The U.S. Borrower
hereby unconditionally promises to pay to the Applicable Agent for the account of each Tranche B-1 Lender the then unpaid principal amount of each Tranche B-1 Term Loan of such Tranche B-1 Lender (i) as provided in Section B2 hereof and
(ii) on the Tranche B-1 Maturity Date. Sections 2.10(a) and 2.10(c) of the Credit Agreement shall not apply to Tranche B-1 Term Loans. To the extent not previously paid all Tranche B-1 Term Loans shall be due and payable on the Tranche B-1
Maturity Date. 
  

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 2. Subject to adjustment pursuant to Section 2.10(d) of the Credit Agreement, the U.S.
Borrower shall repay Term Borrowings of Tranche B-1 Term Loans on each Term Loan Installment Date set forth below in the aggregate principal amount set forth opposite such Term Loan Installment Date: 

 

				
	 Date
	  	Amount
	 December 31, 2010
	  	$	1,625,000
	 March 31, 2011
	  	$	1,625,000
	 June 30, 2011
	  	$	1,625,000
	 September 30, 2011
	  	$	1,625,000
	 December 31, 2011
	  	$	1,625,000
	 March 31, 2012
	  	$	1,625,000
	 June 30, 2012
	  	$	1,625,000
	 September 30, 2012
	  	$	1,625,000
	 December 31, 2012
	  	$	1,625,000
	 March 31, 2013
	  	$	1,625,000
	 June 30, 2013
	  	$	1,625,000
	 September 30, 2013
	  	$	1,625,000
	 December 31, 2013
	  	$	1,625,000
	 March 31, 2014
	  	$	1,625,000
	 June 30, 2014
	  	$	1,625,000
	 September 30, 2014
	  	$	1,625,000
	 December 31, 2014
	  	$	1,625,000
	 March 31, 2015
	  	$	1,625,000
	 June 30, 2015
	  	$	1,625,000
	 September 30, 2015
	  	$	1,625,000
	 December 31, 2015
	  	$	1,625,000
	 March 31, 2016
	  	$	1,625,000
	 June 30, 2016
	  	$	1,625,000
	 September 30, 2016
	  	$	1,625,000
	 December 31, 2016
	  	$	1,625,000
	 March 31, 2017
	  	$	1,625,000
	 June 30, 2017
	  	$	1,625,000
	 September 30, 2017
	  	$	1,625,000
	 Tranche B-1 Maturity Date
	  	$	604,500,000

 3. Tranche B-1
Term Loans shall be subject to the provisions of Section 2.11(c) and (d) of the Credit Agreement on a pro rata basis with the Tranche C Term Loans. In the event that, within one year of the Tranche B-1 Closing Date, (x) Holdings or
any Borrower makes any prepayment of Tranche B-1 Term Loans in connection with any Repricing Transaction, or (y) effects any amendment of this Joinder Agreement or the Credit Agreement resulting in a Repricing Transaction, the U.S. Borrower
shall pay to the Administrative Agent, for the ratable account of each Tranche B-1 Lender, (I) in the case of clause (x), a prepayment premium of 1% of the amount of the Tranche B-1 Term Loans being prepaid and (II) in the case of clause (y), a
payment equal to 1% of the aggregate amount of the Tranche B-1 Term Loans outstanding immediately prior to such amendment. For the purposes of this Joinder Agreement, “Repricing Transaction” shall mean the refinancing or
repricing by the U.S. Borrower of any of the Tranche B-1 Term Loans under this Joinder Agreement and the Credit Agreement (x) with the proceeds 

 

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of any Indebtedness (including, without limitation, any new or additional term loans under the Credit Agreement) or (y) in connection with any amendment to this Joinder Agreement or the
Credit Agreement, in either case, (i) having or resulting in an effective interest rate or weighted average yield (to be determined after giving effect to margins, upfront or similar fees or original issue discount shared with all lenders or
holders thereof (with original issue discount or upfront fees being equated to interest margins based on an assumed four-year average life to maturity (e.g., 25 basis points of interest margin equals 100 basis points in original issue
discount or upfront fees payable on the principal amount of debt)), but excluding the effect of any arrangement, structuring, syndication or other fees payable in connection therewith that are not shared with all lenders or holders thereof) as of
the date of such refinancing that is, or could be by the express terms of such Indebtedness (and not by virtue of any fluctuation in Adjusted Eurocurrency Rate or Alternate Base Rate), less than the effective interest rate for, or weighted average
yield (to be determined on the same basis as above) of such Tranche B-1 Term Loans as of the date of such repricing and (ii) in the case of a refinancing of the Tranche B-1 Term Loans, the proceeds of which are used to repay, in whole or in
part, principal of such outstanding Tranche B-1 Term Loans. 
 4. If any New Term Loans or New Term Commitments are established
following the Tranche B-1 Closing Date, each Tranche B-1 Lender agrees, on behalf of itself and each of its assigns, that, notwithstanding anything contained in Section 2.22 of the Credit Agreement to the contrary, clause (5) of the first
proviso in the fourth sentence of Section 2.22(a) of the Credit Agreement shall apply to increases in the Applicable Margin with respect to the Tranche B-1 Term Loans only until the date that is eighteen (18) months after the Tranche B-1
Closing Date. 
 5. All of the proceeds of the Tranche B-1 Term Loans shall be used to (x) repay a portion of the Initial
Term Loans and to pay any accrued and unpaid interest on such Initial Term Loans and (y) pay any fees and expenses incurred in connection with the borrowing of the Tranche B-1 Term Loans. No representation or warranty under Section 3.12 of
the Credit Agreement shall be deemed to be false or misleading, and no default in the observance of any covenant contained in Section 5.08 of the Credit Agreement shall be deemed to occur or be existing, in each case as a result of the use of
the proceeds of the Tranche B-1 Term Loans set forth in the immediately preceding sentence. 
 6. The Tranche B-1 Term Loans
shall bear interest in the same manner that the Initial Term Loans bear interest under the Credit Agreement; provided that solely for purposes of calculating the interest rate on the Tranche B-1 Term Loans (a) the “floor”
included in the definition of Adjusted Eurocurrency Rate shall be deemed to be 1.50% per annum and (b) the Applicable Margin for Tranche B-1 Term Loans shall be(i) for any day with respect to any ABR Loan that is a Tranche B-1 Term Loan,
the applicable margin set forth below under the caption “Tranche B-1 Term Loan ABR Spread” and (ii) for any day with respect to any Eurocurrency Loan that is a Tranche B-1 Term Loan, the applicable margin set forth below under the
caption “Tranche B-1 Term Loan Eurocurrency Spread, in each case by reference to the Corporate Rating as in effect on such date as set forth below. 
  

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	 Corporate Rating
Moody’s/S&P
	  	Tranche B-1 Term Loan
ABR Spread	 	 	Tranche B-1 Term Loan
Eurocurrency Spread	 
	 Category 1

3Ba1(stable or positive
outlook) / BB+ (stable or
positive outlook)
	  	3.75	% 	 	2.75	% 
	 Category 2

<Ba1 (stable or positive
outlook) / BB+ (stable or
positive outlook)
	  	4.00	% 	 	3.00	% 

 For purposes of the foregoing,
“Corporate Rating” means, as of any date of determination, the corporate credit rating of the U.S. Borrower as determined by S&P and the corporate family rating of the U.S. Borrower as determined by Moody’s; provided
that (a) if the respective Corporate Ratings issued by the foregoing rating agencies differ by one level, then the category for the lower of such Corporate Ratings shall apply (with the Corporate Rating for Category 1 being the highest and the
Corporate Rating for Category 2 being the lowest); and (b) if the U.S. Borrower does not have Corporate Ratings from each of S&P and Moody’s, then the applicable margin set forth in Category 2 shall apply. 

Initially, the applicable margin for Tranche B-1 Term Loans shall be determined based upon the Corporate Rating specified in the certificate delivered by
the U.S. Borrower on the Tranche B-1 Closing Date. Thereafter, each change in the applicable margin for Tranche B-1 Term Loans resulting from a publicly announced change in the Corporate Rating shall be effective, in the case of an upgrade, during
the period commencing on the date of delivery by Holdings or any Borrower to the Administrative Agent of notice thereof pursuant to Section B7 of this Joinder Agreement and ending on the date immediately preceding the effective date of the next such
change and, in the case of a downgrade, during the period commencing on the date of the public announcement thereof and ending on the date immediately preceding the effective date of the next such change. 

7. Each of Holdings and the Borrowers covenants and agrees with each Tranche B-1 Lender that so long as this Joinder Agreement and the
Credit Agreement shall remain in effect and until the commitments have been terminated and the principal of and interest on each Tranche B-1 Term Loan shall have been paid in full, unless a majority of the Tranche B-1 Lenders shall otherwise consent
in writing, each of Holdings and the Borrowers will furnish to the Administrative Agent written notice of any announcement by Moody’s or S&P of any change or possible change in a Corporate Rating. 

 

	 	C.	Representations and Warranties 

1. The execution, delivery and performance of this Joinder Agreement and the Reaffirmation Agreement by each Loan Party party hereto and
thereto (a) have been duly authorized by all corporate, stockholder, limited liability company or partnership action required to be obtained by such Loan Party and (b) will not (i) violate (A) any provision of law, statute, rule
or regulation, or of the certificate or articles of incorporation or other constitutive documents or by-laws of such Loan Party, (B) any applicable order of any court or any rule, regulation or order

  

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of any Governmental Authority or (C) any provision of any indenture, certificate of designation for preferred stock, agreement or other instrument to which such Loan Party is a party or by
which such Loan Party or any of its property is or may be bound, except, in the case of clauses (B) and (C), where such violation will not be deemed to have a Material Adverse Effect or (ii) result in the creation or imposition of any Lien
upon or with respect to any property or assets now owned or hereafter acquired by such Loan Party, other than the Liens created by the Loan Documents. 

2. Each of this Joinder Agreement and the Reaffirmation Agreement has been duly executed and delivered by each Loan Party party hereto
and thereto and constitutes a legal, valid and binding obligation of such Loan Party, enforceable against such Loan Party in accordance with its terms, subject to (i) the effects of bankruptcy, insolvency, moratorium, reorganization, fraudulent
conveyance or other similar laws affecting creditors’ rights generally, (ii) general principles of equity (regardless of whether such enforceability is considered in a proceeding in equity or at law) and (iii) implied covenants of
good faith and fair dealing. 
  

	 	D.	Conditions 

 The making of
the Tranche B-1 Term Loans and the occurrence of the Tranche B-1 Closing Date are subject to the satisfaction of the following conditions: 

1. The Administrative Agent shall have received counterparts of this Joinder Agreement that bear the signatures of (i) the
Administrative Agent, (ii) Holdings, (iii) the U.S. Borrower and (iv) each Tranche B-1 Lender. The Administrative Agent shall have received counterparts to Amendment No. 3 duly executed by each Tranche B-1 Lender. 

2. The Administrative Agent shall have received the following, each of which shall be originals or facsimiles (followed promptly by
originals) unless otherwise specified, each properly executed by a Responsible Officer of the signing Loan Party, each in form and substance reasonably satisfactory to the Administrative Agent and Deutsche Bank AG New York Branch
(“DBAG”): 
 (a) such certificates of resolutions or other action, incumbency certificates
and/or other certificates of Responsible Officers of Holdings and the U.S. Borrower as the Administrative Agent may reasonably require evidencing the identity, authority and capacity of each Responsible Officer thereof authorized to act as a
Responsible Officer in connection with this Joinder Agreement, the Reaffirmation Agreement and the other Loan Documents; 

(b) an opinion from Simpson Thacher & Bartlett LLP, New York counsel to the Loan Parties, in form and substance
reasonably satisfactory to the Administrative Agent and DBAG, covering such matters relating to this Joinder Agreement and the transactions contemplated hereby as the Administrative Agent and DBAG shall reasonably request; 

(c) a certificate from the chief financial officer of the U.S. Borrower, dated the Tranche B-1 Closing Date, certifying
(A) as to the accuracy of the representations and warranties set forth in Section C hereof, (B) as to the satisfaction of the conditions 

 

 -6- 

 
precedent to the making of the New Term Loans constituting Tranche B-1 Term Loans that are set forth in clauses (1), (7), (8) and (9) of the first proviso to the fourth sentence in
Section 2.22(a) of the Credit Agreement (which, in the case of clause (7) of such first proviso, shall demonstrate compliance therewith in reasonable detail), (C) that the Secured Leverage Ratio for the most recently ended Test
Period, determined on a Pro Forma Basis, including after giving effect to the application of the net proceeds from the incurrence of the Tranche B-1 Term Loans, shall not exceed 2.0 to 1.00 and (D) as to the accuracy of the conditions set forth
in Section D3; 
 (d) a Borrowing Request, adapted appropriately for the borrowing of the Tranche B-1 Term Loans;

 (e)(i) a completed “Life-of-Loan” Federal Emergency Management Agency Standard Flood Hazard
Determination with respect to each Mortgaged Property (together with a notice about special flood hazard area status and flood disaster assistance duly executed by the Borrower and each Loan Party relating thereto) and (ii) a copy of, or a
certificate as to coverage under, the insurance policies required by Section 5.02 including, without limitation, flood insurance policies) and the applicable provisions of the Security Documents, each of which shall be endorsed or
otherwise amended to include a “standard” or “New York” lender’s loss payable or mortgagee endorsement (as applicable) and shall name the Collateral Agent, on behalf of the Secured Parties, as additional insured, in form and
substance satisfactory to the Administrative Agent; 
 (f) receipt of a duly executed payoff letter in respect of
all obligations under the Existing Credit Agreement and the accompanying UCC-3 termination statements; 
 (g) the
prepayment notices required by the Credit Agreement in connection with the prepayment of the Initial Term Loans; and 

(h) all corporate and other proceedings, and all documents, instruments and other legal matters in connection with the
transactions contemplated by this Joinder Agreement shall be reasonably satisfactory in all respects to the Administrative Agent and DBAG. 

3. The representations and warranties set forth in Article III of the Credit Agreement shall be true and correct in all material
respects (except that any representation and warranty that is qualified as to “materiality” or “Material Adverse Effect” shall be true and correct in all respects as so qualified) on and as of the Tranche B-1 Closing Date, with
the same effect as if made on and as of the Tranche B-1 Closing Date, except to the extent such representations and warranties expressly relate to an earlier date (in which case such representations and warranties shall be true and correct in all
material respects as of such earlier date). Upon the Tranche B-1 Closing Date and immediately after giving effect to the making of the Tranche B-1 Term Loans, no Event of Default or Default shall have occurred and be continuing. 

4. All documentation and other information required by bank regulatory authorities under applicable “know your customer” and
anti-money laundering rules and regulations shall have been provided to any Person that is or will become a Tranche B-1 Lender (to the 

 

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extent such Person is not a Lender under the Credit Agreement prior to giving effect to the Tranche B-1 Closing Date and such Person has requested such documentation and information reasonably in
advance of the Tranche B-1 Closing Date). 
 5. All arrangers and bookmanagers with respect to the Tranche B-1 Term Loans shall
have received all fees and other amounts due and payable to them at or simultaneously upon the borrowing of the Tranche B-1 Term Loans, including reimbursement or payment of all reasonable documented out-of-pocket expenses (including reasonable
fees, disbursements and other charges of counsel). 
 6. Each Loan Party shall have entered into a written instrument reasonably
satisfactory to the Administrative Agent and DBAG pursuant to which it confirms that it consents to this Joinder Agreement and the Tranche B-1 Term Loans and that the Security Documents to which it is party will continue to apply in respect of the
Credit Agreement (after giving effect to this Joinder Agreement) and the Obligations of such Loan Party (the “Reaffirmation Agreement”). 
  

	 	E.	Effect of this Joinder Agreement. 

1. Except as expressly set forth herein, this Joinder Agreement shall not by implication or otherwise limit, impair, constitute a waiver
of, or otherwise affect the rights and remedies of the Lenders or the Agents under the Credit Agreement or any other Loan Document, and shall not alter, modify, amend or in any way affect any of the terms, conditions, obligations, covenants or
agreements contained in the Credit Agreement or any other Loan Document, all of which are ratified and affirmed in all respects and shall continue in full force and effect. Nothing herein shall be deemed to entitle any Loan Party to a consent
to, or a waiver, amendment, modification or other change of, any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document in similar or different circumstances. 

2. On and after the Tranche B-1 Closing Date, each reference in the Credit Agreement to “this Agreement”,
“hereunder”, “hereof”, “herein”, or words of like import, and each reference to the Credit Agreement in any other Loan Document shall be deemed to be a reference to the Credit Agreement as supplemented by this Joinder
Agreement. This Joinder Agreement shall constitute a “Loan Document” for all purposes of the Credit Agreement and the other Loan Documents. 

3. To the extent required by Section 2.22 of the Credit Agreement, the Administrative Agent hereby consents to each Tranche B-1
Lender making a Tranche B-1 Term Loan. The Administrative Agent also exercises its rights to waive the notice referred to in the second sentence of Section 2.22(a) of the Credit Agreement, to the extent such notice relates to the Tranche B-1
Term Loans and Tranche B-1 Term Commitments. 
  

	 	F.	Miscellaneous. 

 1. All
covenants, agreements, representations and warranties made by Holdings, the U.S. Borrower and the Loan Parties herein and in the Reaffirmation Agreement in the certificates or other instruments prepared or delivered in connection with or pursuant
hereto shall 
  

 -8- 

 
be considered to have been relied upon by the Lenders and each Issuing Bank and shall survive the making by the Tranche B-1 Term Loans, the execution and delivery of hereof and the Reaffirmation
Agreement, regardless of any investigation made by such persons or on their behalf, and shall continue in full force and effect as long as the principal of or any accrued interest on any Tranche B-1 Term Loan or any other amount payable in respect
thereof is outstanding. 
 2. Within 45 days (or such greater number of days as may be agreed to by the Administrative Agent in
its sole discretion) of the Tranche B-1 Closing Date, Holdings and the U.S. Borrower will, and will cause the other Loan Parties to, prepare, execute and deliver (or cause to be prepared, executed and delivered) such documentation and instruments
(including without limitation mortgage amendments, title datedown endorsements and local counsel opinions) that the Administrative Agent reasonably deems necessary to amend the U.S. Mortgages in order to cause the Obligations (as increased by the
making of the Tranche B-1 Term Loans) to be appropriately secured by the property underlying such U.S. Mortgages. Prior to the time that such U.S. Mortgages have been so amended (and the related documentation so delivered), notwithstanding anything
contained to the contrary in the Loan Documents, the Tranche B-1 Lenders hereby agree that no proceeds from the foreclosure or other realization with respect to the U.S. Mortgages may be applied to Obligations in respect of the Tranche B-1 Term
Loans, and such proceeds shall be applied to the other Obligations as if the Tranche B-1 Term Loans were not outstanding (and this sentence shall cease to be of any force or effect when such amendments to such U.S. Mortgages and related
documentation are so delivered). 
 3. THIS JOINDER AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF
THE STATE OF NEW YORK. 
 4. EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY
RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS JOINDER AGREEMENT. EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER
PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS
JOINDER AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS PARAGRAPH. 
 5. This Joinder
Agreement and the Reaffirmation Agreement may be executed in two or more counterparts, each of which shall constitute an original but all of which, when taken together, shall constitute but one contract. Delivery of an executed counterpart to this
Agreement by facsimile, PDF or other electronic transmission shall be as effective as delivery of a manually signed original. 
  

 -9- 

 6. Each party hereto hereby irrevocably and unconditionally submits, for itself and its
property, to the non-exclusive jurisdiction of any New York State court or federal court of the United States of America sitting in the borough of Manhattan, and any appellate court from any thereof, in any action or proceeding arising out of
or relating to this Joinder Agreement and the Reaffirmation Agreement, or for recognition or enforcement of any judgment, and each of the parties hereto hereby irrevocably and unconditionally agrees that all claims in respect of any such action or
proceeding may be heard and determined in such New York State or, to the extent permitted by law, in such federal court. Each of the parties hereto agrees that a final judgment in any such action or proceeding shall be conclusive and may be
enforced in other jurisdictions by suit on the judgment or in any other manner provided by law. Nothing in this Joinder Agreement shall affect any right that any Lender may otherwise have to bring any action or proceeding relating to this Joinder
Agreement or Reaffirmation Agreement against Holdings, any Borrower or any Loan Party or their properties in the courts of any jurisdiction. 

7. Each of Holdings, the U.S. Borrower and each other Loan Party hereby irrevocably and unconditionally waives, to the fullest extent it
may legally and effectively do so, any objection which it may now or hereafter have to the laying of venue of any suit, action or proceeding arising out of or relating to this Joinder Agreement or the Reaffirmation Agreement in any New York
State or federal court. Each of the parties hereto hereby irrevocably waives, to the fullest extent permitted by law, the defense of an inconvenient forum to the maintenance of such action or proceeding in any such court. 

 

 -10- 

 IN WITNESS WHEREOF, the parties hereto have caused this Joinder Agreement to be duly
executed by their respective authorized officers as of the day and year first above written. 
  

					
	NALCO HOLDINGS LLC
		
	By:	 	/s/ Stephen N. Landsman
		 	Name:	 	Stephen N. Landsman
		 	Title:	 	Vice President

  

					
	NALCO COMPANY
		
	By:	 	/s/ Stephen N. Landsman
		 	Name:	 	Stephen N. Landsman
		 	Title:	 	Vice President

  

					
	BANK OF AMERICA, N.A., as Administrative Agent
		
	By:	 	/s/ Don B. Pinzon
		 	Name:	 	Don B. Pinzon
		 	Title:	 	Vice President

					
	 DEUTSCHE BANK AG, NEW YORK BRANCH,

as a Tranche B-1 Lender

		
	By:	 	/s/ Omayra Laucella
		 	Name:	 	Omayra Laucella
		 	Title:	 	Vice President

  

					
		
	By:	 	/s/ Erin Morrissey
		 	Name:	 	Erin Morrissey
		 	Title:	 	Vice PresidentJoinder Agreement, dated as of October 5, 2010

 Exhibit 10.2 

JOINDER AGREEMENT, dated as of October 5, 2010 (this “Joinder Agreement”) by and among BANK OF AMERICA, N.A., in
its capacity as administrative agent under the credit agreement referred to below, NALCO HOLDINGS LLC, a Delaware limited liability company (“Holdings”), NALCO COMPANY, a Delaware corporation ( “Nalco” or the
“U.S. Borrower”), and the Persons listed on Schedule 1 hereto. 
 WHEREAS, reference is made to that certain
credit agreement dated as of May 13, 2009 (as amended, the “Credit Agreement”) among Holdings, the U.S. Borrower, the foreign subsidiary borrowers from time to time party thereto, the lenders party thereto from time to time,
Bank of America, N.A., as administrative agent (in such capacity, the “Administrative Agent”) and as collateral agent for the Lenders, and the arrangers and bookmanagers party thereto. 

WHEREAS, Section 2.22 of the Credit Agreement permits the Borrower to request New Term Commitments from time to time on the terms
and conditions specified therein. 
 WHEREAS, the Borrower has requested the establishment of New Term Commitments in an
aggregate principal amount of $100.0 million (such New Term Commitments, the “Tranche C-1 Term Commitments”). 

WHEREAS, the proceeds of the New Term Loans made pursuant to the Tranche C-1 Term Commitments shall be used as set forth below.

 WHEREAS, each of the Persons set forth on Schedule 1 hereto is, on the terms and subject to the conditions set forth herein,
willing to become a New Term Lender with respect to the Tranche C-1 Term Loans (the “Tranche C-1 Lenders”), with each such Tranche C-1 Lender having a Tranche C-1 Term Commitment in the amount set forth opposite its name on such
Schedule 1. 
 NOW, THEREFORE, in consideration of the mutual agreements herein contained and other good and valuable
consideration, the sufficiency and receipt of which are hereby acknowledged, the parties hereto agree as follows: 
  

	 	A.	Making of Tranche C Term Loans. 

1. Capitalized terms used but not defined in this Joinder Agreement have the meanings assigned thereto in the Credit Agreement. The
provisions of Section 1.02 of the Credit Agreement are hereby incorporated by reference herein, mutatis mutandis. This Joinder Agreement is an “Increase Joinder” referred to in Section 2.22(b) of the Credit Agreement.

 2. Except as set forth in this Joinder Agreement, the terms and provisions of the Tranche C-1 Term Commitments and Tranche
C-1 Term Loans (as defined below) shall be identical to the Tranche C Term Loans made pursuant to Section 2.22 of the Credit Agreement and the Joinder Agreement, dated as of December 7, 2009 (the “Tranche C Joinder
Agreement”), by and among Holdings, the U.S. Borrower, the Administrative Agent and the Tranche C Lenders party thereto and shall otherwise be subject to the provisions of the Credit Agreement and the other Loan Documents. For the avoidance
of doubt, except as expressly provided otherwise herein, the Tranche C-1 Term Commitments, the Tranche C Term Loans and the Tranche C-1 Lenders shall be treated as New Term Commitments, New Term Loans and New Term Lenders,

 
respectively, for purposes of the Credit Agreement and the other Loan Documents; provided that Tranche C-1 Term Commitments, Tranche C-1 Term Loans and Tranche C-1 Lenders may be
designated as such (instead of as New Term Commitments, New Term Loans and New Term Lenders, respectively) on any documentation relating thereto. 

3. Subject to the terms and conditions set forth herein (including, without limitation, the satisfaction of the conditions set forth in
Section D below and the provisions of Section A5 below) and in the Credit Agreement, each Tranche C-1 Lender severally agrees to make to the U.S. Borrower, on a date specified by the U.S. Borrower in the Borrowing Request referred to in Section D
below (the “Tranche C-1 Closing Date”), a single loan to the U.S. Borrower denominated in Dollars in an aggregate principal amount equal to such Tranche C-1 Lender’s Tranche C-1 Term Commitment (a “Tranche C-1 Term
Loan”). 
 4. The U.S. Borrower agrees to pay on the Tranche C-1 Closing Date to each Tranche C-1 Lender, as fee
compensation for the funding of such Tranche C-1 Lender’s Tranche C-1 Term Loan, a closing fee (the “Tranche C-1 Closing Fee”) in an amount equal to 4.5% of the stated principal amount of such Tranche C-1 Lender’s Tranche
C-1 Term Commitment. Such Tranche C-1 Closing Fee will be in all respects fully earned, due and payable on the Tranche C-1 Closing Date and non-refundable and non-creditable thereafter and such Tranche C-1 Closing Fee shall be paid by the U.S.
Borrower to the Tranche C-1 Lender on the Tranche C-1 Closing Date. 
 5. Each Tranche C-1 Lender hereby consents to the
amendments to (x) the Credit Agreement set forth in Section 1 of Amendment No. 3 to the Credit Agreement (“Amendment No. 3”) attached hereto as Exhibit A and (y) the U.S. Collateral Agreement set forth in
Section 2 of Amendment No. 3. 
 6. If not drawn before 5:00 p.m., New York City time on October 12, 2010,
the Tranche C-1 Term Commitments shall expire at such time and shall from and after such time be of no further force or effect. The Tranche C-1 Term Commitment of each Tranche C-1 Lender shall automatically terminate upon the making of the Tranche
C-1 Term Loan relating to such Tranche C-1 Term Commitment. 
  

	 	B.	Terms of the Tranche C-1 Term Loans. 

1. The Tranche C-1 Term Loans shall mature on the Term Loan Maturity Date and shall be repaid in accordance with Section 2.09(a)(ii)
of the Credit Agreement; provided that (a) the foregoing is subject to Section B2 below and (b) notwithstanding the last paragraph of Section 2.10(a) of the Credit Agreement (x) no amount of the Tranche C-1 Term Loans
shall be repaid pursuant to such Section 2.10(a) prior to December 31, 2010 and (y) from and after December 31, 2010, on each Term Loan Installment Date, the U.S. Borrower shall pay an amount equal to 1/4 of 1% of the original
principal amount of the Tranche C-1 Term Loans (as such amounts may be reduced by operation of Section 2.10(d) of the Credit Agreement (as modified by Section B2 below)), and any otherwise unpaid principal amount of the Tranche C-1 Term Loans
shall be due and payable on the Term Loan Maturity Date. 
  

 -2- 

 2. Notwithstanding anything contained in the Loan Documents to the contrary, to the extent
any Tranche B-1 Term Loans (as defined below) are outstanding, the U.S. Borrower may determine to apply all or a portion of any prepayment of any Term Loans pursuant to Section 2.11(a), (c) or (d) of the Credit Agreement solely to the
Tranche B-1 Term Loans, and each Tranche C-1 Lender, on behalf of itself and each of its assigns, consents to any such application. To the extent any prepayments are not so applied to Tranche C-1 Term Loans in accordance with the previous sentence,
the amortization payments of the Tranche C-1 Term Loans shall not be reduced by operation of Section 2.10(d) of the Credit Agreement. All prepayments pursuant to Sections 2.11(a), (c) and (d) of the Credit Agreement that are applied
to Tranche C-1 Term Loans shall be subject to the pro rata sharing provisions of Section 2.18 of the Credit Agreement, and all payments of the Term Loans (other than pursuant to Section 2.11(a), (c) or (d) of the Credit Agreement
solely to the extent a determination is made in accordance with the previous sentences of this paragraph) shall be made pro rata among the Term Loans as provided in Section 2.18 of the Credit Agreement, Section 5.02 of the U.S. Collateral
Agreement (and similar provisions of the other Security Documents) and any other provision of the Loan Documents. The “Tranche B-1 Term Loans” are any Tranche B-1 Term Loans (as defined in the Joinder Agreement dated October 5,
2010 relating to the making of such Tranche B-1 Term Loans) that are outstanding under the Credit Agreement on the Tranche C-1 Closing Date, as well as any other Term Loans under the Credit Agreement that refinance such Tranche B-1 Term Loans.

 3. If any New Term Loans or New Term Commitments are established following the Tranche C-1 Closing Date, each Tranche C-1
Lender agrees, on behalf of itself and each of its assigns, that, notwithstanding anything contained in Section 2.22 of the Credit Agreement to the contrary, clause (5) of the first proviso in the fourth sentence of Section 2.22(a) of
the Credit Agreement shall under no circumstances cause the Applicable Margin with respect to any Tranche C-1 Term Loans to be increased. Furthermore, notwithstanding anything contained in the Loan Documents, each Tranche C-1 Lender agrees, on
behalf of itself and each of its assigns, that, for the avoidance of doubt, solely with respect to any of its Tranche C-1 Term Loans, it will not have any right to consent to any amendment or modification of the Credit Agreement that changes
(i) the Applicable Margin as it relates to any Tranche B-1 Term Loans or (ii) to the extent intended solely to increase, decrease or eliminate a minimum level of the Adjusted Eurocurrency Rate for any Tranche B-1 Term Loans, the proviso to
the definition of Adjusted Eurocurrency Rate (it being understood that this sentence shall not affect any rights of any Tranche C-1 Lender in its capacity as the holder of any other Loans or Commitments under the Credit Agreement). 

4. All of the proceeds of the Tranche C-1 Term Loans shall be used to repay a portion of the Term Loans made pursuant to
Section 2.01(a) of the Credit Agreement on the Closing Date (the “Initial Term Loans”) and to pay any accrued and unpaid interest on such Initial Term Loans and pay any fees and expenses incurred in connection with the
borrowing of the Tranche C-1 Term Loans. No representation or warranty under Section 3.12 of the Credit Agreement shall be deemed to be false or misleading, and no default in the observance of any covenant contained in Section 5.08 of the
Credit Agreement shall be deemed to occur or be existing, in each case as a result of the use of the proceeds of the Tranche C-1 Term Loans set forth in the immediately preceding sentence. 

 

 -3- 

 5. The Tranche C-1 Term Loans shall bear interest in the same manner that all other Term
Loans bear interest under the Credit Agreement; provided that solely for purposes of calculating the interest rate on the Tranche C-1 Term Loans (a) the definition of Adjusted Eurocurrency Rate shall be deemed not to have the proviso
contained in such definition and (b) the Applicable Margin for Tranche C-1 Term Loans shall be, with respect to any Tranche C-1 Term Loan that is (i) a Eurocurrency Loan, 1.75% per annum and (ii) an ABR Loan, 2.75% per
annum. 
  

	 	C.	Representations and Warranties 

1. The execution, delivery and performance of this Joinder Agreement and the Reaffirmation Agreement by each Loan Party party hereto and
thereto (a) have been duly authorized by all corporate, stockholder, limited liability company or partnership action required to be obtained by such Loan Party and (b) will not (i) violate (A) any provision of law, statute, rule
or regulation, or of the certificate or articles of incorporation or other constitutive documents or by-laws of such Loan Party, (B) any applicable order of any court or any rule, regulation or order of any Governmental Authority or
(C) any provision of any indenture, certificate of designation for preferred stock, agreement or other instrument to which such Loan Party is a party or by which such Loan Party or any of its property is or may be bound, except, in the case of
clauses (B) and (C), where such violation will not be deemed to have a Material Adverse Effect or (ii) result in the creation or imposition of any Lien upon or with respect to any property or assets now owned or hereafter acquired by such
Loan Party, other than the Liens created by the Loan Documents. 
 2. Each of this Joinder Agreement and the Reaffirmation
Agreement has been duly executed and delivered by each Loan Party party hereto and thereto and constitutes a legal, valid and binding obligation of such Loan Party, enforceable against such Loan Party in accordance with its terms, subject to
(i) the effects of bankruptcy, insolvency, moratorium, reorganization, fraudulent conveyance or other similar laws affecting creditors’ rights generally, (ii) general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law) and (iii) implied covenants of good faith and fair dealing. 
  

	 	D.	Conditions 

 The making of
the Tranche C-1 Term Loans and the occurrence of the Tranche C-1 Closing Date are subject to the satisfaction of the following conditions: 

1. The Administrative Agent shall have received counterparts of this Joinder Agreement that bear the signatures of (i) the
Administrative Agent, (ii) Holdings, (iii) the U.S. Borrower and (iv) each Tranche C-1 Lender. The Administrative Agent shall have received counterparts to Amendment No. 3 duly executed by each Tranche C-1 Lender. 

 

 -4- 

 2. The Administrative Agent shall have received the following, each of which shall be
originals or facsimiles (followed promptly by originals) unless otherwise specified, each properly executed by a Responsible Officer of the signing Loan Party, each in form and substance reasonably satisfactory to the Administrative Agent and
Deutsche Bank AG New York Branch (“DBAG”): 
 (a) such certificates of resolutions or other
action, incumbency certificates and/or other certificates of Responsible Officers of Holdings and the U.S. Borrower as the Administrative Agent may reasonably require evidencing the identity, authority and capacity of each Responsible Officer
thereof authorized to act as a Responsible Officer in connection with this Joinder Agreement, the Reaffirmation Agreement and the other Loan Documents; 

(b) an opinion from Simpson Thacher & Bartlett LLP, New York counsel to the Loan Parties, in form and substance
reasonably satisfactory to the Administrative Agent and DBAG, covering such matters relating to this Joinder Agreement and the transactions contemplated hereby as the Administrative Agent and DBAG shall reasonably request; 

(c) a certificate from the chief financial officer of the U.S. Borrower, dated the Tranche C-1 Closing Date, certifying
(A) as to the accuracy of the representations and warranties set forth in Section C hereof, (B) as to the satisfaction of the conditions precedent to the making of the New Term Loans constituting Tranche C-1 Term Loans that are set forth
in clauses (1), (7), (8) and (9) of the first proviso to the fourth sentence in Section 2.22(a) of the Credit Agreement (which, in the case of clause (7) of such first proviso, shall demonstrate compliance therewith in reasonable
detail), (C) that the Secured Leverage Ratio for the most recently ended Test Period, determined on a Pro Forma Basis, including after giving effect to the application of the net proceeds from the incurrence of the Tranche C-1 Term Loans, shall
not exceed 2.0 to 1.00 and (D) as to the accuracy of the conditions set forth in Section D3; 
 (d) a
Borrowing Request, adapted appropriately for the borrowing of the Tranche C-1 Term Loans; 
 (e) (i) a completed
“Life-of-Loan” Federal Emergency Management Agency Standard Flood Hazard Determination with respect to each Mortgaged Property (together with a notice about special flood hazard area status and flood disaster assistance duly executed by
the Borrower and each Loan Party relating thereto) and (ii) a copy of, or a certificate as to coverage under, the insurance policies required by Section 5.02 including, without limitation, flood insurance policies) and the
applicable provisions of the Security Documents, each of which shall be endorsed or otherwise amended to include a “standard” or “New York” lender’s loss payable or mortgagee endorsement (as applicable) and shall name the
Collateral Agent, on behalf of the Secured Parties, as additional insured, in form and substance satisfactory to the Administrative Agent; 

(f) receipt of a duly executed payoff letter in respect of all obligations under the Existing Credit Agreement and the
accompanying UCC-3 termination statements; 
 (g) the prepayment notices required by the Credit Agreement in
connection with the prepayment of the Initial Term Loans; and 
 (h) all corporate and other proceedings, and all
documents, instruments and other legal matters in connection with the transactions contemplated by this Joinder Agreement shall be reasonably satisfactory in all respects to the Administrative Agent and DBAG. 

 

 -5- 

 3. The representations and warranties set forth in Article III of the Credit Agreement
shall be true and correct in all material respects (except that any representation and warranty that is qualified as to “materiality” or “Material Adverse Effect” shall be true and correct in all respects as so qualified) on and
as of the Tranche C-1 Closing Date, with the same effect as if made on and as of the Tranche C-1 Closing Date, except to the extent such representations and warranties expressly relate to an earlier date (in which case such representations and
warranties shall be true and correct in all material respects as of such earlier date). Upon the Tranche C-1 Closing Date and immediately after giving effect to the making of the Tranche C-1 Term Loans, no Event of Default or Default shall have
occurred and be continuing. 
 4. All documentation and other information required by bank regulatory authorities under
applicable “know your customer” and anti-money laundering rules and regulations shall have been provided to any Person that is or will become a Tranche C-1 Lender (to the extent such Person is not a Lender under the Credit Agreement
prior to giving effect to the Tranche C-1 Closing Date and such Person has requested such documentation and information reasonably in advance of the Tranche C-1 Closing Date). 

5. All arrangers and bookmanagers with respect to the Tranche C-1 Term Loans shall have received all fees and other amounts due and
payable to them at or simultaneously upon the borrowing of the Tranche C-1 Term Loans, including reimbursement or payment of all reasonable documented out-of-pocket expenses (including reasonable fees, disbursements and other charges of
counsel). 
 6. Each Loan Party shall have entered into a written instrument reasonably satisfactory to the Administrative Agent
and DBAG pursuant to which it confirms that it consents to this Joinder Agreement and the Tranche C-1 Term Loans and that the Security Documents to which it is party will continue to apply in respect of the Credit Agreement (after giving effect to
this Joinder Agreement) and the Obligations of such Loan Party (the “Reaffirmation Agreement”). 
  

	 	E.	Effect of this Joinder Agreement. 

1. Except as expressly set forth herein, this Joinder Agreement shall not by implication or otherwise limit, impair, constitute a waiver
of, or otherwise affect the rights and remedies of the Lenders or the Agents under the Credit Agreement or any other Loan Document, and shall not alter, modify, amend or in any way affect any of the terms, conditions, obligations, covenants or
agreements contained in the Credit Agreement or any other Loan Document, all of which are ratified and affirmed in all respects and shall continue in full force and effect. Nothing herein shall be deemed to entitle any Loan Party to a consent
to, or a waiver, amendment, modification or other change of, any of the terms, conditions, obligations, covenants or agreements contained in the Credit Agreement or any other Loan Document in similar or different circumstances. 

 

 -6- 

 2. On and after the Tranche C-1 Closing Date, each reference in the Credit Agreement to
“this Agreement”, “hereunder”, “hereof”, “herein”, or words of like import, and each reference to the Credit Agreement in any other Loan Document shall be deemed to be a reference to the Credit Agreement as
supplemented by this Joinder Agreement. This Joinder Agreement shall constitute a “Loan Document” for all purposes of the Credit Agreement and the other Loan Documents. 

3. To the extent required by Section 2.22 of the Credit Agreement, the Administrative Agent hereby consents to each Tranche C-1
Lender making a Tranche C-1 Term Loan. The Administrative Agent also exercises its rights to waive the notice referred to in the second sentence of Section 2.22(a) of the Credit Agreement, to the extent such notice relates to the Tranche C-1
Term Loans and Tranche C-1 Term Commitments. 
  

	 	F.	Miscellaneous. 

 1. All
covenants, agreements, representations and warranties made by Holdings, the U.S. Borrower and the Loan Parties herein and in the Reaffirmation Agreement in the certificates or other instruments prepared or delivered in connection with or pursuant
hereto shall be considered to have been relied upon by the Lenders and each Issuing Bank and shall survive the making by the Tranche C-1 Term Loans, the execution and delivery of hereof and the Reaffirmation Agreement, regardless of any
investigation made by such persons or on their behalf, and shall continue in full force and effect as long as the principal of or any accrued interest on any Tranche C-1 Term Loan or any other amount payable in respect thereof is outstanding.

 2. Within 45 days (or such greater number of days as may be agreed to by the Administrative Agent in its sole discretion) of
the Tranche C-1 Closing Date, Holdings and the U.S. Borrower will, and will cause the other Loan Parties to, prepare, execute and deliver (or cause to be prepared, executed and delivered) such documentation and instruments (including without
limitation mortgage amendments, title datedown endorsements and local counsel opinions) that the Administrative Agent reasonably deems necessary to amend the U.S. Mortgages in order to cause the Obligations (as increased by the making of the Tranche
C-1 Term Loans) to be appropriately secured by the property underlying such U.S. Mortgages. Prior to the time that such U.S. Mortgages have been so amended (and the related documentation so delivered), notwithstanding anything contained to the
contrary in the Loan Documents, the Tranche C-1 Lenders hereby agree that no proceeds from the foreclosure or other realization with respect to the U.S. Mortgages may be applied to Obligations in respect of the Tranche C-1 Term Loans, and such
proceeds shall be applied to the other Obligations as if the Tranche C-1 Term Loans were not outstanding (and this sentence shall cease to be of any force or effect when such amendments to such U.S. Mortgages and related documentation are so
delivered). 
 3. THIS JOINDER AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF
NEW YORK. 
  

 -7- 

 4. EACH PARTY HERETO HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE
LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS JOINDER AGREEMENT. EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF
ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO
THIS JOINDER AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS PARAGRAPH. 
 5. This Joinder
Agreement and the Reaffirmation Agreement may be executed in two or more counterparts, each of which shall constitute an original but all of which, when taken together, shall constitute but one contract. Delivery of an executed counterpart to this
Agreement by facsimile, PDF or other electronic transmission shall be as effective as delivery of a manually signed original. 

6. Each party hereto hereby irrevocably and unconditionally submits, for itself and its property, to the non-exclusive jurisdiction of
any New York State court or federal court of the United States of America sitting in the borough of Manhattan, and any appellate court from any thereof, in any action or proceeding arising out of or relating to this Joinder Agreement and the
Reaffirmation Agreement, or for recognition or enforcement of any judgment, and each of the parties hereto hereby irrevocably and unconditionally agrees that all claims in respect of any such action or proceeding may be heard and determined in such
New York State or, to the extent permitted by law, in such federal court. Each of the parties hereto agrees that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the
judgment or in any other manner provided by law. Nothing in this Joinder Agreement shall affect any right that any Lender may otherwise have to bring any action or proceeding relating to this Joinder Agreement or Reaffirmation Agreement against
Holdings, any Borrower or any Loan Party or their properties in the courts of any jurisdiction. 
 7. Each of Holdings, the U.S.
Borrower and each other Loan Party hereby irrevocably and unconditionally waives, to the fullest extent it may legally and effectively do so, any objection which it may now or hereafter have to the laying of venue of any suit, action or proceeding
arising out of or relating to this Joinder Agreement or the Reaffirmation Agreement in any New York State or federal court. Each of the parties hereto hereby irrevocably waives, to the fullest extent permitted by law, the defense of an
inconvenient forum to the maintenance of such action or proceeding in any such court. 
  

 -8- 

 IN WITNESS WHEREOF, the parties hereto have caused this Joinder Agreement to be duly
executed by their respective authorized officers as of the day and year first above written. 
  

					
	NALCO HOLDINGS LLC
		
	By	 	/s/ Stephen N. Landsman
		 	Name:	 	Stephen N. Landsman
		 	Title:	 	Vice President

  

					
	NALCO COMPANY
		
	By	 	/s/ Stephen N. Landsman
		 	Name:	 	Stephen N. Landsman
		 	Title:	 	Vice President

  

					
	BANK OF AMERICA, N.A., as Administrative Agent
		
	By	 	/s/ Don B. Pinzon
		 	Name:	 	Don B. Pinzon
		 	Title:	 	Vice President

  

 -9- 

					
	 DEUTSCHE BANK AG, NEW YORK BRANCH,

as a Tranche C-1 Lender

		
	By:	 	/s/ Omayra Laucella
		 	Name:	 	Omayra Laucella
		 	Title:	 	Vice President

  

					
		
	By:	 	/s/ Erin Morrissey
		 	Name:	 	Erin Morrissey
		 	Title:	 	Vice President

  

 -10-

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