EXHIBIT 23

            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (Nos. 333-66714, 333-66712, 333-64688, 333-64690 and
33-63953) and Registration Statement on Form S-3 (No. 333-57932) of Insituform
Technologies, Inc. of our report dated March 16, 2005, relating to the financial
statements, management's assessment of the effectiveness of internal control
over financial reporting and the effectiveness of internal control over
financial reporting, which appears in this Annual Report on Form 10-K.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

St. Louis, Missouri
March 16, 2005