Minn. Stat. § 86B.535: MARINE TOILETS.

Subdivision 1. Retention device required.

A watercraft or other marine conveyance on the waters of the state may not be equipped with a marine toilet unless also equipped with a retention device acceptable to the Pollution Control Agency.

Subd. 2. List of retention devices.

(a) The Pollution Control Agency shall, upon request, furnish a list of the types of retention devices currently available and considered acceptable for the purposes of this section for use with marine toilets.

(b) The commissioner of natural resources shall furnish the sheriff of each county with a list of retention facilities acceptable to the Pollution Control Agency.