The metropolitan waste control commission, a metropolitan commission organized and existing under the laws of the state of Minnesota (the "commission"), in order to receive and retain grants in compliance with the federal water pollution control act amendments of 1972 and regulations thereunder (the "act"), has determined to impose an industrial user sewer strength charge upon users of the metropolitan disposal system (as defined in Minnesota statutes section 473.121, subdivision 24) to recover operation and maintenance costs of treatment works attributable to the strength of the discharge of industrial waste, such sewer strength charge being in addition to the charge based upon the volume of discharge. In order for the city to pay such costs based upon strength of industrial discharge and allocated to it each year by the commission, it is hereby found, determined and declared to be necessary to establish sewer strength charges and a formula for the computation thereof for all industrial users receiving waste treatment services within or served by the city. Furthermore, Minnesota statutes section 444.075, subdivision 3, empowers the city to make such sewer charge a charge against the owner, lessee, occupant or all of them and certify unpaid charges to the county auditor as a tax lien against the property served. (Ord. 105, sec. 1, 2-7-1977)