Exhibit 99.1

        WASTE CONNECTIONS EXPECTS INCREASED SECOND QUARTER INSURANCE COST

    FOLSOM, Calif., July 6 /PRNewswire-FirstCall/ -- Waste Connections, Inc.
(NYSE: WCN) today announced that it expects to accrue additional costs for prior
year insurance claims of approximately $3.8 million (approximately $2.4 million
net of taxes) in the second quarter of 2006. The increase is based on projected
losses on open claims determined by our third party administrator and a third
party actuarial review of the Company's estimated insurance liability, both of
which are updated quarterly.

    Ronald J. Mittelstaedt, Chairman and Chief Executive Officer, said, "We are
disappointed in this development as we have a rigorous process in place to
review and manage our self-insurance program. The increased cost we have
experienced in the quarter is due primarily to developments in certain older
claims resulting in significant increases in potential costs above previous
actuarially calculated estimates. For example, the estimated potential loss for
two older auto claims recently increased from approximately $300,000 to $1.7
million."

    Waste Connections also announced that it expects interest expense in the
second quarter to be approximately $1 million (approximately $0.6 million net of
taxes) lower than previously expected due to the redemption during the quarter
of its $175 million Floating Rate Convertible Subordinated Notes due 2022 (the
"Notes"). Notes converted into common stock prior to redemption were not
entitled to receive interest accrued from May 1st. The Company paid
approximately $175 million in cash and issued 961,175 shares of the Company's
common stock in connection with the conversion and redemption.

    Waste Connections, Inc. is an integrated solid waste services company that
provides solid waste collection, transfer, disposal and recycling services in
mostly secondary markets in the Western and Southern U.S. The Company serves
more than one million residential, commercial and industrial customers from a
network of operations in 22 states. The Company also provides intermodal
services for the movement of containers in the Pacific Northwest. Waste
Connections, Inc. was founded in September 1997 and is headquartered in Folsom,
California. For more information, visit the Waste Connections web site at
www.wasteconnections.com.

    Certain statements contained in this press release are forward-looking in
nature. These statements can be identified by the use of forward-looking
terminology such as "believes," "expects," "may," "will," "should," or
"anticipates" or the negative thereof or comparable terminology, or by
discussions of strategy. Waste Connections' business and operations are subject
to a variety of risks and uncertainties and, consequently, actual results may
differ materially from those projected by any forward-looking statements.
Factors that could cause actual results to differ from those projected are
discussed in greater detail in Waste Connections' filings with the Securities
and Exchange Commission, including its most recent Annual Report on Form 10-K.
There may be additional risks of which Waste Connections is not presently aware
or that it currently believes are immaterial which could have an adverse impact
on its business. Waste Connections makes no commitment to revise or update any
forward-looking statements in order to reflect events or circumstances after the
date any such statement is made.

SOURCE  Waste Connections, Inc.
    -0-                             07/06/2006
    /CONTACT:  Worthing Jackman of Waste Connections, Inc., +1-916-608-8266,
or worthingj@wasteconnections.com/
    /Web site:  http://www.wcnx.org/