Minn. Stat. § 115A.555: RECYCLING CENTER DESIGNATION.

The agency shall designate recycling centers for the purpose of section 173.086. To be designated as a recycling center, a recycling facility must be open a minimum of 12 operating hours each week, 12 months each year, and must accept for recycling:

(1) at least four different materials such as paper, glass, plastic, and metal; and

(2) if the recycling center accepts metal, hazard signs, as defined in section 161.242, subdivision 2, paragraph (d), to the same extent that a junk yard dealer must accept hazard signs under section 161.242, subdivision 6a.