Minn. Stat. § 473.847

The operator or owner of a mixed municipal solid waste disposal facility in the metropolitan area is not liable under any other law for response costs incurred by the agency at that facility under section 473.845 , if the facility has been closed for 20 years in compliance with the closure and postclosure rules of the agency. Any provision of this section which relieves the operator or owner of a facility from liability for the payment of the agency's response costs must not be construed to affect the liability of any other person who may be liable for those costs.