EXHIBIT 99.1

(INSITUFORM-TECH) (INSU) Insituform Technologies, Inc. Announces Acquisition of
the Business of Insituform East, Inc.

         Chesterfield, MO - September 5, 2003 - Insituform Technologies, Inc.
(Nasdaq National Market: INSU)("Insituform") announced today that it completed
its purchase of the business of Insituform East, Inc., including selected
assets, for approximately $5.5 million in cash.

         Insituform East, Inc. was the final remaining independent licensee of
the Insituform(R) cured-in-place pipe ("CIPP") process and NuPipe(R) form and
fold process in North America. Along with the business, selected assets such as
equipment, inventory, backlog, and license rights were included in the deal.

         Commenting, Thomas S. Rooney, Jr., President and Chief Executive
Officer of Insituform, said, "We are pleased to announce the completion of the
Insituform East purchase. This marks the integration of the final remaining
North American licensee of the Insituform CIPP process into Insituform's
operations. The opportunity for expansion in this region is extremely appealing,
and we believe that we have taken the steps to sustain a competitive advantage
in this environment."

         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 news 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