Exhibit 23.1

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of Insituform Technologies, Inc. of our report dated February 23, 2007, 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 Insituform Technologies, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2006.