INDEX TO EXHIBITS

Exhibit         Description
- -------         -----------

  24            Power of Attorney.


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                                                                      EXHIBIT 24


                                POWER OF ATTORNEY
                                -----------------


         Know all by these presents, that the undersigned hereby constitutes and
appoints each of David F. Morris and Suta Tungsiripat signing singly, the
undersigned's true and lawful attorney-in-fact to:

         (1)      execute for and on behalf of the undersigned, in accordance
                  with the undersigned's capacity as a reporting person of
                  Insituform Technologies, Inc. (the "Company"), Forms 3, 4 and
                  5 in accordance with Section 16(a) of the Securities Exchange
                  Act of 1934, as amended, and the rules thereunder (the "Act");

         (2)      do and perform any and all acts for and on behalf of the
                  undersigned which may be necessary or desirable to complete
                  and execute any such Form 3, 4 or 5 and timely file such form
                  with the United States Securities and Exchange Commission and
                  any stock exchange or similar authority; and

         (3)      take any other action of any type whatsoever in connection
                  with the foregoing which, in the opinion of such
                  attorney-in-fact, may be of benefit to, in the best interest
                  of, or legally required by, the undersigned, it being
                  understood that the documents executed by such
                  attorney-in-fact on behalf of the undersigned pursuant to this
                  Power of Attorney shall be in such form and shall contain such
                  terms and conditions as such attorney-in-fact may approve in
                  his discretion.

         The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as such
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this Power of Attorney and the
rights and powers herein granted. The undersigned acknowledges that the
foregoing attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Act.

         This Power of Attorney revokes any Power of Attorney previously
executed by the undersigned with respect to the undersigned's reporting
obligation pursuant to Section 16 of the Act. This Power of Attorney shall
remain in full force and effect until the undersigned is no longer required to
file Forms 3, 4 and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

         IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed this 18th day of January 2005.




                                                    /s/  Sheldon Weinig
                                                    ----------------------------
                                                    Sheldon Weinig


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