Michigan Compiled Laws, Chapter 324. Natural Resources and Environmental Protection § 324.8714

Sec. 8714.  (1) Upon confirmation of an adverse impact on groundwater, the director may, upon reasonable notice, require a person to furnish any information that the person may have relating to the identification, nature, and quantity of pesticides and fertilizers that are or have been used on a particular site and to current or past production practices that may have impacted groundwater quality.  This information shall be treated as confidential business information and is not subject to the freedom of information act, 1976 PA 442, MCL 15.231 to 15.246.

(2) The director may, upon written request, authorize persons to land-apply materials contaminated with pesticides or fertilizers at agronomic rates.  This authorization shall prescribe appropriate operational control activities to protect the application location and shall identify both the location of remediation and the location or locations where such a land application will take place.