Waste Management to Release 3rd Quarter Earnings on October 30

Date: September 30, 2008

Source: Waste Management, Inc.

Waste Management, Inc. Sets Date for Third Quarter 2008 Earnings Release Conference Call and Announces Third Quarter 2008 Conference Presentation Schedule

Waste Management, Inc. (NYSE: WMI) announced that it has scheduled an analyst conference call on Thursday, October 30, 2008 at 10:00 Eastern Time to discuss third quarter 2008 financial results. These results are expected to be released before the opening of the market on Thursday, October 30, 2008 and will be available on Waste Management's website, www.wm.com, after release to the wire services.

Certain statements and answers to questions during the conference call may contain "forward-looking statements." These statements, and all phases of the Company's operations, are subject to risks and uncertainties, any one of which could cause actual results to differ materially from those described in the forward-looking statements. Investors are reminded that these forward-looking statements must be considered in conjunction with the cautionary warnings and risk factors, which are detailed in Waste Management's most recent Annual Report on Form 10-K filed with the SEC and available from the Company.

What: Waste Management third quarter 2008 earnings release conference call

When: Thursday, October 30, 2008 at 10:00 a.m. Eastern Time

Where: A live audio webcast of the conference call can we accessed by logging onto www.wm.com and selecting "Earnings Webcast" in the Business News section

You may also listen to the analyst conference call by telephone by contacting the conference call operator 5-10 minutes prior to the scheduled start time and asking for the "Waste Management Conference Call Call ID 66401070." US/Canada Dial-In #: (877) 710-6139. Int'l/Local Dial-In #: (706) 643-7398. Participation will be in listen-only mode.

Replay: For those unable to listen to the live call, a replay will be available beginning at approximately noon ET October 30th through 5:00 p.m. ET on November 13th. To hear a replay of the call over the Internet, access Waste Management's website at www.wm.com. To hear a telephonic replay of the call, dial 800-642-1687 or 706-645-9291 and enter conference code 66401070.

Waste Management, Inc. also announced today that Company executives currently plan to present at the following investment conferences during the fourth quarter of 2008:

November 5 Goldman Sachs Global Industrials Conference
December 2 Friedman Billings Ramsey Capital Markets Investor Conference

Although these presentations are not expected to include any material non-public information, the Company will post the presentation slides on its website. The slides will be posted some time during the 24-hour period prior to the scheduled presentation time. The slides may be accessed via the Investor Relations section of the Company's corporate website, which is located at www.wm.com. We anticipate that all of these conferences will be web cast and we will post audio links on our website as they are made available to us.

About Waste Management

Waste Management, based in Houston, Texas, is the leading provider of comprehensive waste management services in North America. Our subsidiaries provide collection, transfer, recycling and resource recovery, and disposal services. We are also a leading developer, operator and owner of waste-to-energy and landfill gas-to-energy facilities in the United States. Our customers include residential, commercial, industrial, and municipal customers throughout North America.

For more information, contact:
Waste Management, Inc., Houston
Analysts: Jim Alderson, 713-394-2281
or
Media: Lynn Brown, 713-394-5093
www.WM.com.

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