WASTE MANAGEMENT, INC. Officers' Certificate Delivered Pursuant to Section 301 of the Indenture dated as of September 10, 1997

Exhibit 4.3

WASTE MANAGEMENT, INC.
Officers’ Certificate Delivered Pursuant to
Section 301 of the Indenture dated as of September 10, 1997

     The undersigned, the Vice President — Finance and Treasurer, and the Corporate Secretary of Waste Management, Inc. (the “Company”), hereby certify that:

     1. This Certificate is delivered to The Bank of New York Mellon Trust Company, N.A. (the current successor to Texas Commerce Bank National Association), as trustee (the “Trustee”), pursuant to Sections 102 and 301 of the Indenture dated as of September 10, 1997 between the Company, formerly known as USA Waste Services, Inc., and the Trustee in connection with the Company Order dated February 26, 2009 (the “Order”) for the authentication and delivery by the Trustee of $450,000,000 aggregate principal amount of 7.375% Notes due 2019 (the “Notes”).

     2. The undersigned have read Sections 102, 103, 301 and 303 of the Indenture and the definitions in the Indenture relating thereto.

     3. The statements made herein are based either upon the personal knowledge of the persons making this Certificate or on information, data and reports furnished to such persons by the officers, counsel, department heads or employees of the Company who have knowledge of the facts involved.

     4. The undersigned have examined the Order, and they have examined the covenants, conditions and provisions of the Indenture relating thereto.

     5. In the opinion of the persons making this Certificate, they have made such examination or investigation as is necessary to enable them to express an informed opinion as to whether or not all conditions provided for in the Indenture with respect to the Order have been complied with.

     6. All conditions precedent provided in the Indenture to the authentication by the Trustee of $450,000,000 aggregate principal amount of Notes have been complied with, and such Notes may be delivered in accordance with the Order as provided in the Indenture.

     7. The terms of the Notes (including the Form of Note) as set forth in Annex A to this Officers’ Certificate have been approved by officers of the Company as duly authorized by resolutions of the Board of Directors of the Company as of August 25, 2006 and such resolutions, copies of which are attached hereto as Annex B, are in full force and effect as of the date hereof.

     IN WITNESS WHEREOF, the undersigned has hereunto executed this Certificate as of February 26, 2009.

Annex A

Terms of the Notes

     Pursuant to authority granted by the Board of Directors of the Company on August 25, 2006 and the Sole Director of Waste Management Holdings, Inc. on October 30, 2009 and February 17, 2009, the Company has approved the establishment, issuance, execution and delivery of a new series of Securities (as defined in the Indenture) to be issued under the Indenture dated as of September 10, 1997 (the “Indenture”), between the Company, formerly known as USA Waste Services, Inc., and The Bank of New York Mellon Trust Company, N.A. (the current successor to Texas Commerce Bank National Association), as trustee (the “Trustee”), the terms of which are set forth below. Capitalized terms used but not defined herein are used herein as defined in the Indenture.

ANNEX A
TO
TERMS OF NOTES
(Form of Note)

BOOK-ENTRY SECURITY

     THIS SECURITY IS A BOOK-ENTRY SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A NOMINEE OF A DEPOSITORY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND NO TRANSFER OF THIS SECURITY (OTHER THAN A TRANSFER OF THIS SECURITY AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY) MAY BE REGISTERED EXCEPT IN SUCH LIMITED CIRCUMSTANCES.

     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY (AS DEFINED BELOW) OR ITS AGENT FOR REGISTRATION FOR TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

WASTE MANAGEMENT, INC.

7.375% SENIOR NOTES DUE 2019

CUSIP 94106LAU3

     WASTE MANAGEMENT, INC., a Delaware corporation (the “Company,” which term includes any successors under the Indenture hereinafter referred to), for value received, hereby promises to pay to CEDE & CO. or registered assigns, at the office or agency of the Company, the principal sum of Four Hundred Fifty Million ($450,000,000) U.S. dollars, or such lesser

principal sum as is shown on the attached Schedule of Exchanges of Definitive Security, on March 11, 2019 in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of public and private debts, and to pay interest at an annual rate of 7.375% payable on March 11 and September 11 of each year, to the person in whose name this Security is registered at the close of business on the record date for such interest, which shall be the preceding March 1 or September 1, respectively, payable commencing September 11, 2009, with interest consisting of interest accrued from February 26, 2009.

     Reference is made to the further provisions of this Security set forth on the reverse hereof. Such further provisions shall for all purposes have the same effect as though fully set forth at this place.

     The statements in the legends set forth above are an integral part of the terms of this Security and by acceptance hereof the Holder of this Security agrees to be subject to, and bound by, the terms and provisions set forth in each such legend.

     This Security is issued in respect of a series of Securities of an initial aggregate of U.S. $450,000,000 in principal amount designated as the 7.375% Senior Notes due 2019 of the Company and is governed by the Indenture dated as of September 10, 1997, duly executed and delivered by the Company, formerly known as USA Waste Services, Inc., to The Bank of New York Mellon Trust Company N.A. (the current successor to Texas Commerce Bank National Association) as trustee (the “Trustee”), as supplemented by Board Resolutions (as defined in the Indenture) (such Indenture and Board Resolutions, collectively, the “Indenture”). The terms of the Indenture are incorporated herein by reference. This Security shall in all respects be entitled to the same benefits as definitive Securities under the Indenture.

     If and to the extent that any provision of the Indenture limits, qualifies or conflicts with any other provision of the Indenture that is required to be included in the Indenture or is deemed applicable to the Indenture by virtue of the provisions of the Trust Indenture Act of 1939, as amended, such required provision shall control.

     The Company hereby irrevocably undertakes to the Holder hereof to exchange this Security in accordance with the terms of the Indenture without charge.

     This Security shall not be valid or become obligatory for any purpose until the Certificate of Authentication hereon shall have been manually signed by the Trustee under the Indenture.

     IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

CERTIFICATE OF AUTHENTICATION

     This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

REVERSE OF BOOK-ENTRY SECURITY

WASTE MANAGEMENT, INC.

7.375% SENIOR NOTES DUE 2019

     This Security is one of a duly authorized issue of unsecured debentures, notes or other evidences of indebtedness of the Company (the “Debt Securities”) of the series hereinafter specified, all issued or to be issued under and pursuant to the Indenture, to which Indenture reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Trustee, the Company and the Holders of the Debt Securities. The Debt Securities may be issued in one or more series, which different series may be issued in various aggregate principal amounts, may mature at different times, may bear interest (if any) at different rates, may be subject to different sinking, purchase or analogous funds (if any) and may otherwise vary as provided in the Indenture. This Security is one of a series designated as the 7.375% Senior Notes due 2019 of the Company, in initial aggregate principal amount of $450,000,000 (the “Securities”).

     1. Interest.

     The Company promises to pay interest on the principal amount of this Security at the rate of 7.375% per annum.

     The Company will pay interest semi-annually on March 11 and September 11 of each year (each an “Interest Payment Date”), commencing September 11, 2009. Interest on the Securities will accrue from the most recent date to which interest has been paid or, if no interest has been paid on the Securities, from February 26, 2009. Interest will be computed on the basis of a 360-day year consisting of twelve 30-day months. The Company shall pay interest (including post-petition interest in any proceeding under any applicable bankruptcy laws) on overdue installments of interest (without regard to any applicable grace period) and on overdue principal and premium, if any, from time to time on demand at the rate of 7.375% per annum, in each case to the extent lawful.

     2. Method of Payment.

     The Company shall pay interest on the Securities (except Defaulted Interest) to the persons who are the registered Holders at the close of business on the Regular Record Date immediately preceding the Interest Payment Date. Any such interest not so punctually paid or duly provided for (“Defaulted Interest”) may be paid to the persons who are registered Holders at the close of business on a Special Record Date for the payment of such Defaulted Interest, or in any other lawful manner not inconsistent with the requirements of any securities exchange on which such Securities may then be listed if such manner of payment shall be deemed practicable by the Trustee, as more fully provided in the Indenture. Except as provided below, the Company shall pay principal and interest in such coin or currency of the United States of America as at the time of payment shall be legal tender for payment of public and private debts (“U.S. Legal Tender”). Payments in respect of a Book-Entry Security (including principal, premium, if any, and interest) will be made by wire transfer of immediately available funds to the accounts

specified by the Depository. Payments in respect of Securities in definitive form (including principal, premium, if any, and interest) will be made at the office or agency of the Company maintained for such purpose within the Borough of Manhattan, the City of New York, which initially will be at the corporate trust office of The Bank of New York Mellon, located at 101 Barclay Street, Floor 21W, New York, New York, 10286 or at the option of the Company, payment of interest may be made by check mailed to the Holders on the Regular Record Date or on the Special Record Date at their addresses set forth in the Security Register of Holders.

     3. Paying Agent and Registrar.

     Initially, The Bank of New York Mellon, on behalf (for the benefit) of The Bank of New York Mellon Trust Company, N.A., will act as Paying Agent and Registrar. The Company may change any Paying Agent, Registrar or co-Registrar at any time upon notice to the Trustee and the Holders. The Company or any of its Subsidiaries may, subject to certain exceptions, act as Paying Agent, Registrar or co-Registrar.

     4. Indenture.

     This Security is one of a duly authorized issue of Debt Securities of the Company issued and to be issued in one or more series under the Indenture.

     Capitalized terms herein are used as defined in the Indenture unless otherwise defined herein. The terms of the Securities include those stated in the Indenture and all indentures supplemental thereto, those made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended, as in effect on the date of the Indenture, and those terms stated in the Officers’ Certificate to the Trustee, duly authorized by resolutions of the Board of Directors of the Company on August 25, 2006 (the “Resolutions”) and the written consents of the sole Director of Waste Management Holdings, Inc. on October 30, 2008 and February 17, 2009 (the “Consents”). The Securities are subject to all such terms, and Holders of Securities are referred to the Indenture, all indentures supplemental thereto, said Act, said Resolutions and said Consents and Officers’ Certificate for a statement of them. The Securities of this series are general unsecured obligations of the Company limited with an initial aggregate principal amount of $450,000,000.

     5. Redemption.

     The Securities will be redeemable, at the option of the Company, at any time in whole, or from time to time in part, at a Redemption Price (the “Make-Whole Price”) equal to the greater of: (i) 100% of the principal amount of the Securities to be redeemed; or (ii) the sum of the present values of the remaining scheduled payments of principal and interest (at the rate in effect on the date of calculation of the Redemption Price) on the Securities (exclusive of interest accrued to the Redemption Date) discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the applicable Treasury Yield plus 50 basis points; plus, in either case, accrued interest to the Redemption Date.

     Securities called for redemption become due on the Redemption Date. Notices of redemption will be mailed at least 30 but not more than 60 days before the Redemption Date to each holder of record of the Securities to be redeemed at its registered address. The notice of redemption for the Securities will state, among other things, the amount of Securities to be

redeemed, the Redemption Date, the manner of determining the Make-Whole Price and the place(s) that payment will be made upon presentation and surrender of Securities to be redeemed. Unless the Company defaults in payment of the Make-Whole Price, interest will cease to accrue on any Securities that have been called for redemption at the Redemption Date. If less than all the Securities are redeemed at any time, the Trustee will select the Securities to be redeemed on a pro rata basis or by any other method the Trustee deems fair and appropriate.

     For purposes of determining the Make-Whole Price, the following definitions are applicable:

     “Treasury Yield” means, with respect to any Redemption Date applicable to the Securities, the rate per annum equal to the semi-annual equivalent yield to maturity (computed as of the third Business Day immediately preceding such Redemption Date) of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the applicable Comparable Treasury Price for such Redemption Date.

     “Comparable Treasury Issue” means the United States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining term of the Securities that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Securities.

     “Independent Investment Banker” means any of Barclays Capital Inc., Credit Suisse Securities (USA) LLC, Deutsche Bank Securities Inc. and Greenwich Capital Markets, Inc. (and their respective successors), or, if all of such firms are unwilling or unable to select the applicable Comparable Treasury Issue, an independent investment banking institution of national standing appointed by the Trustee and reasonably acceptable to the Company.

     “Comparable Treasury Price” means, with respect to any Redemption Date, (i) the bid price for the Comparable Treasury Issue (exp