HOUSTON--(BUSINESS WIRE)--March 28, 2005--Waste Management Inc. (NYSE:WMI) announced that it has scheduled an analyst conference call on Thursday, April 28, 2005 from 8:00-9:00 a.m. Central Time (9:00-10:00 a.m. ET) to discuss first quarter 2005 financial results. These results are expected to be released before the opening of the market on Thursday, April 28, 2005 and will be available on Waste Management's Web site, http://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 http://www.wm.com. Company spokespeople 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; Cherie Rice, vice president finance and treasurer; and Greg Nikkel, director -- Investor Relations.

You may also listen to the analyst conference call by telephone by contacting the conference call operator at 877-710-6139, 5-10 minutes prior to the scheduled start time, and asking for the "Waste Management Conference Call -- Call ID 4978881."

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 are also available from the Company.

What:   Waste Management first quarter 2005 earnings release
conference call

When:   Thursday, April 28, 2005, from 8:00-9:00 a.m. CT
(9:00-10:00 a.m. ET)

Where:  http://www.wm.com

How:  Live over the Internet, logging on to the address above and
selecting "1Q2005 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
http://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 10:00 a.m. CT
April 28 through 5:00 p.m. CT on May 12. To hear a replay of the call
over the Internet, access the Waste Management Web site at
http://www.wm.com. To hear a telephonic replay of the call, dial
800-642-1687 and enter conference code 4978881.

Waste Management Inc. is its industry's leading provider of comprehensive waste management services. Based in Houston, the Company serves municipal, commercial, industrial and residential customers throughout North America.

    CONTACT: Waste Management Inc., Houston
             Analysts:
             Greg Nikkel, 713-265-1358
             or
             Media:
             Heather Browne, 713-265-1514

    SOURCE: Waste Management Inc.