EXHIBIT 99.1

(INSITUFORM-TECH) (INSU) Insituform Technologies, Inc. Amends Bank Credit
Facility Debt Covenants

         Chesterfield, MO - December 1, 2003 - Insituform Technologies, Inc.
(NASDAQ National Market: INSU) (the "Company") today announced that its bank
credit facility has been amended to contain less restrictive debt covenants.

         The amendment, effective on November 26, 2003, eases the minimum fixed
charge coverage and maximum leverage ratios. As a result, the Company paid
$169,000 in fees, will be subject to a maximum net debt of $85 million and
prohibited from purchasing treasury stock unless the fixed charge coverage ratio
is greater than or equal to 1.10 to 1.00 and the leverage ratio is not more than
2.25 to 1.00 for two consecutive quarters. The Company anticipates it will be
able to comply with all debt covenants under the amended credit facility.

         The amendment will be filed promptly with the Securities and Exchange
Commission on Form 8-K.

         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 the Company 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 that could affect results
include, among others, the competitive environment for the Company's products
and services, the geographical distribution and mix of the Company's work, and
other factors set forth in reports and documents filed by the Company with the
Securities and Exchange Commission from time to time. The Company 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