Insituform Wins Large iPlus™ Composite Contract for the San Diego County Regional Airport Authority

CHESTERFIELD, MO, May 27, 2009 – Insituform Technologies, Inc. (Nasdaq Global Select Market: INSU) announced today that it was awarded a $2.6 million contract for the San Diego County Regional Airport Authority. Insituform will rehabilitate nearly 2,000 feet of 96-inch sanitary sewer pipes using its iPlus™ Composite system. Work is expected to begin June 1 and should be completed by the end of August 2009.

Joe Lane, the General Manager for Insituform’s West Region, explained some of the characteristics of this project. “The Airport Authority recognized that the addition of a new terminal and parking area at the airport would require the reinforcement of the existing sanitary sewer in order to handle the increased loading on the underground pipe. In addition to increasing the structural capabilities of the liner, the project specifications required minimal reduction in flow capacity. iPlus™ Composite, a fiber-reinforced, premium cured-in-place pipe (CIPP) product that provides greater strength and stiffness with nearly half the wall thickness of conventional CIPP products, is the ideal solution for the Airport Authority.”

Other unique field conditions at the project site include soil contaminants and high ground water. Lane continued, “Our crews have successfully installed CIPP for over 35 years. We will work with the Airport Authority as well as the general contractor, Charles King Company, to ensure that the challenges of this project are addressed and the Airport’s expectations are met.”

By combining innovative engineering technology with superior materials, the iPlus™ Composite system is a fully structural pipeline rehabilitation product suitable for a wide range of medium- to large-diameter sanitary and storm sewers.

For more information contact:

David Morris
Chief Administrative Officer
636-530-3329