921.14 LOCAL LIMITS.
   No waste contributor shall discharge or cause or allow to be discharged, any of the following pollutants, unless otherwise specified in a wastewater discharge permit. These permits shall be issued by the City to individual dischargers where necessary, and will impose daily discharge concentration limits and volumes. Mass-based limits may be specified for any or all of the listed pollutants where applicable.
   In the absence of such specific wastewater discharge permit conditions, no person shall discharge any of the following pollutants, except as such pollutants may occur, and only in the concentrations such pollutants may occur, in the water supplied to the premises.
   Pollutant
   Arsenic
   Cadmium
   Chromium
   Copper
   Cyanide (HCN)
   Lead
   Mercury
   Nickel
   Silver   
   Zinc