49 C.F.R. § 39.23
(b) As a PVO, you must include an assurance of compliance with this Part in your contracts or agreements with any contractors who provide to the public services that are subject to the requirements of this Part. Noncompliance with this assurance is a material breach of the contract on the contractor's part. With respect to contracts or agreements existing on November 3, 2010, you must ensure the inclusion of this assurance by November 3, 2011 or on the next occasion on which the contract or agreement is renewed or amended, whichever comes first.