(a) A person commits an offense if the person introduces or causes to be introduced into the MS4 any discharge that is not composed entirely of stormwater.
(b) It is an affirmative defense to any enforcement action for a violation of subsection (a) above that the discharge was composed entirely of one or more of the following categories of discharges:
(1) A discharge authorized by, and in full compliance with, an NPDES permit (other than the NPDES permit for discharges from the MS4);
(2) A discharge or flow resulting from firefighting by the fire department;
(3) A discharge or flow of fire protection water that does not contain oil or hazardous substances or materials that the fire code requires to be contained and treated prior to discharge, in which case treatment adequate to remove harmful quantities of pollutants must have occurred prior to discharge;
(4) Agricultural stormwater runoff;
(5) A discharge or flow from water line flushing or disinfection that contains no harmful quantity of total residual chlorine (TRC) or any other chemical used in line disinfection;
(6) A discharge or flow from lawn watering or landscape irrigation;
(7) A discharge or flow from a diverted stream flow or natural spring;
(8) A discharge or flow from uncontaminated pumped groundwater or rising groundwater;
(9) Uncontaminated groundwater infiltration (as defined at 40 C.F.R. § 35.2005(20)) to the MS4;
(10) Uncontaminated discharge or flow from a foundation drain, crawl space pump or footing drain;
(11) A discharge or flow from a potable water source not containing any harmful substance or material from the cleaning or draining of a storage tank or other container;
(12) A discharge or flow from air conditioning condensation that is unmixed with water from a cooling tower, emissions scrubber, emissions filter or any other source of pollutant;
(13) A discharge or flow from individual residential car washing;
(14) A discharge or flow from a riparian habitat or wetland;
(15) A discharge or flow from cold water (or hot water with prior permission of the director) used in street washing or cosmetic cleaning that is not contaminated with any soap, detergent, degreaser, solvent, emulsifier, dispersant or any other harmful cleaning substance;
(16) Drainage from a private residential swimming pool containing no harmful quantities of chlorine or other chemicals. Drainage from swimming pool filter backwash is prohibited; or
(17) A discharge or flow of uncontaminated stormwater pumped from an excavation.
(c) No affirmative defense shall be available under subsection (b) above if:
(1) The discharge or flow in question has been determined by the director to be a source of a pollutant or pollutants to the waters of the United States or to the MS4;
(2) Written notice of such determination has been provided to the discharger; and
(3) The discharge has continued after the expiration of the time given in the notice to cease the discharge.
(d) A person commits an offense if the person introduces or causes to be introduced into the MS4 any harmful quantity of any substance.
(Ord. 12274, § 1, passed 11-28-1995; Ord. 13808, § 1, passed 5-18-1999)