Waste Management to Release 2nd Quarter on July 31

Date: July 2, 2007

Source: Waste Management, Inc.

Waste Management, Inc. Announces Second Quarter 2007 Earnings Release Conference Call and Third Quarter 2007 Conference Presentation Schedule

Waste Management, Inc. (NYSE: WMI) announced that it has scheduled an analyst conference call on Tuesday, July 31, 2007 from 9:00 - 10:00 a.m. Central Time (10:00-11:00 a.m. ET) to discuss second quarter 2007 financial results. These results are expected to be released before the opening of the market on Tuesday, July 31, 2007 and will be available on Waste Management's website, www.wm.com, after release to the wire services.

Waste Management invites you to listen to the analyst conference call, which is open to the public and will be broadcast live over the Internet, at www.wm.com. Company spokespersons will include David Steiner, Chief Executive Officer, Larry O'Donnell, President and Chief Operating Officer, Robert G. Simpson, Senior Vice President and Chief Financial Officer, and Greg Nikkel, Director - Investor Relations.

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 4344708." US/Canada Dial-In #: 877-710-6139. Int'l/Local Dial-In #: 706-643-7398.

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 second quarter 2007 earnings release conference call

When: Tuesday, July 31, 2007, from 9:00-10:00 a.m. CT (10:00-11:00 a.m. ET)

Where: www.wm.com

How: Live over the Internet, logging on to the address above and selecting "2Q 2007 Earnings Report Webcast." You can also listen to the conference call by telephone at the number above. Participation will be in listen-only mode.

Requirements: To listen to the call over the Internet, you will need a computer with a sound card, speakers or headphones, and at least a 28.8 Kbps connection to the Internet. If you do not have the Real Player plug-in for your browser, please download it from www.real.com/products/player/.

Replay: For those unable to listen to the live call, a replay will be available 24 hours a day beginning at approximately noon CT July 31st through 5:00 p.m. CT on August 14th. To hear a replay of the call over the Internet, access the Waste Management 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 4344708.

Waste Management, Inc. also announced today that Company executives currently plan to present at the following investment conference during the third quarter of 2007:

Sept 17 Banc of America Annual Investment 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.

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. Ways in which Waste Management helps Think Green® can be found at www.wm.com.

For more information, contact:
Waste Management, Inc., Houston
Analysts: Greg Nikkel, 713-265-1358
Media: Lynn Brown, 713-394-5093
Web site: www.WM.com.

Sign up to receive our free Weekly News Bulletin