The discharge of inorganic mercury compounds and metallic mercury to the waters of the state shall not exceed the background level by more than 0.05 pound per 1,000,000 gallons of effluent discharged. The maximum discharge of inorganic mercury compounds and metallic mercury shall be 0.15 pound of mercury per day averaged over a 30-day period; however, in any one day there shall not be a discharge in excess of 0.50 pound.
Wis. Admin. Code Department of Natural Resources NR 100.02