EXHIBIT 5





	KRUGMAN & KAILES LLP
	Park 80 West - Plaza Two
	Saddle Brook, New Jersey 07663
	(201) 845-3434







							  July 6, 2001


Insituform Technologies, Inc.
702 Spirit 40 Park Drive
Chesterfield, Missouri  63005

Dear Sirs:

	We have acted as counsel for Insituform Technologies, Inc., a
Delaware corporation (the "Company"), in connection with the
registration statement on Form S-8 being filed by the Company
under the Securities Act of 1933 with respect to 1,000,000 shares
(the "Shares") of the Company's class A common stock, $.01 par
value, which have been or are to be offered by the Company to its
directors pursuant to the Insituform Technologies, Inc. 1992
Director Stock Option Plan (the "Plan").

	In connection with such registration statement, we have
examined such records and documents and such questions of law as
we have deemed appropriate for purposes of this opinion.  On the
basis of such examination, we advise you that in our opinion:

		(1)  the Company has been duly incorporated and is
validly existing as a corporation in good standing under the
laws of the State of Delaware; and

		(2)  the Shares have been duly and validly authorized
and, when issued and paid for in accordance with the terms of
the Plan and stock options duly granted or to be granted
thereunder, will be validly issued, fully paid and non-
assessable.


Insituform Technologies, Inc.	July 6, 2001
Page 2 of 2

	We hereby consent to the filing of this opinion as an exhibit
to the foregoing registration statement.


			Very truly yours,

			s/Krugman & Kailes LLP

			KRUGMAN & KAILES LLP








































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