Mich. Comp. Laws § 339.6133

Sec. 1133. This article shall not be construed to relieve from or lessen the responsibility or liability of any person owning, operating, controlling, or installing plumbing for damages to individuals or property caused by any defect in the plumbing, and this state shall not be held as assuming that responsibility or liability by reason of the inspection or examination of that plumbing, the issuance of a certificate of approval, or the grant of a license or certificate under this article.