EXHIBIT 99.1

(INSITUFORM-TECH) (INSUA) Insituform Technologies, Inc. Announces Acquisition of
Elmore Pipe Jacking, Inc.

         Chesterfield, MO - May 2, 2002 - Insituform Technologies, Inc. (Nasdaq
National Market: INSUA) ("Insituform") today announced they have completed the
acquisition of the business and certain assets and liabilities of Elmore Pipe
Jacking, Inc. ("Elmore") of Lake View, California, for approximately $12.5
million. Elmore has been a regional provider of trenchless tunneling,
microtunneling, segmented lining and pipe jacking services in the western U.S.
for over 20 years.
         The acquisition is expected to be accretive to earnings, beginning in
the current year. Elmore has been working on numerous projects in the western
U.S. and will bring an additional current backlog of $19 million. In recent
years, Elmore's revenues have averaged in excess of $20 million per year, with
revenues expected to remain above that level for the foreseeable future.
         Commenting, Anthony W. (Tony) Hooper, Chairman of the Board, President
and Chief Executive Officer of Insituform, stated, "We are pleased to add the
accumulated experience and capabilities of Elmore and its portfolio of
trenchless products to our Tunneling Business. Together with recent large
tunneling project awards in Chicago and St. Louis, this acquisition positions
our Tunneling Business segment for continued success. The combination of Elmore
with our existing businesses also makes Insituform one of the top microtunneling
companies in the U.S."
         Insituform Technologies, Inc. is a leading worldwide provider of
proprietary technologies and services for rehabilitating sewer, water and other
underground piping systems without digging and disruption. More information
about Insituform can be found on its Internet site at www.insituform.com.
         This press release contains forward-looking statements, which are
inherently subject to risks and uncertainties that could cause actual results to
differ materially from those projected. Factors which could affect results
include, among others, the competitive environment for Insituform's products and
services, the geographical distribution and mix of Insituform's work, and other
factors set forth in reports and documents filed by Insituform with the
Securities and Exchange Commission from time to time. Insituform does not assume
a duty to update forward-looking statements. Please use caution and do not place
reliance on forward-looking statements.

CONTACT:  Insituform Technologies, Inc.
          Joseph A. White, Vice President and CFO
          (636) 530-8000