(A) No person shall cause any illicit discharge to enter the MS4 unless such discharge meets one of the exceptions specific below.
(1) Authorized non-storm water discharges separately regulated by an individual or general NPDES permit;
(2) Temporary non-storm water discharges authorized by USEPA pursuant to sections 104(a) or 104(b) of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) that either: (i) will comply with water quality standards as applicable or relevant and appropriate requirements (“ARARs”) under section 121(d)(2) of CERCLA; or (ii) are subject to either (a) a written waiver of ARARs by USEPA pursuant to section 121 (d)(4) of CERCLA or (b) a written determination by USFiPA that compliance with ARARs is not practicable considering the exigencies of the situation pursuant to 40 CFR. section 300.415(j);
(3) Authorized non-storm water discharges from emergency fire fighting activities (i.e., flows necessary for the protection of life or property);
(4) Natural flows, including:
i. Natural springs;
ii. Flows from riparian habitats and wetlands;
iii. Diverted stream flows, authorized by the State or Regional Water Board;
iv. Uncontaminated ground water infiltration;
v. Rising ground waters, where ground water seepage is not otherwise covered by a NPDES permit; or
(5) Conditionally exempt non-storm water discharges provided they met all required conditions specified in Subsection 16.34.020 (B) below.
(B) Conditional Exemptions from Non-Strom Water Discharge Prohibition. The following categories of non-storm water discharges are conditionally exempt from the non-storm water discharge prohibition, provided they meet all required conditions specified below.
(1) Conditionally Exempt Essential Non-Storm Water Discharges: These consist of those discharges that fall within one of the categories below; meet all required best management practices (BMPs) as specified in i. and ii. below, including those enumerated in the referenced BMP manuals; are essential public services discharge activities; and are directly or indirectly required by other state or federal statute and/or regulation:
i. Discharges from essential non-emergency fire lighting activities provided appropriate BMPs are implemented based on the CAL FIRE, Office of the State Fire Marshal’s Water-Based Fire Protection Systems Discharge Best Management Practices Manual (September 2011) for water-based fire protection system discharges, and based on Riverside County’s Best Management Practices Plan for Urban Runoff Management (May 1, 2004) or equivalent BMP manual for fire training activities and post-emergency fire fighting activities;
ii. Discharges from drinking water supplier distribution systems, where not otherwise regulated by an individual or general NPDES permit, provided appropriate BMPs are implemented based on the American Water Works Association (California-Nevada Section) Guidelines for the Development of Your Best Management Practices (BMP) Manual for Drinking Water System Releases (2005) or equivalent industry standard BMP manual.
(2) Those discharges that fall within one of the categories below, provided that the discharge itself is not a source of pollutants and meets all required conditions specified in Table 8 of the Los Angeles County NPDES MS4 Permit and as otherwise specified by the Director:
i. Dewatering of lakes;
ii. Landscape irrigation;
iii. Dechlorinated/debrominated swimming pool/spa discharges, where not otherwise regulated by a separate NPDES permit;
iv. Dewatering of decorative fountains;
v. Non-commercial car washing by residents or by non-profit organizations;
vi. Street/sidewalk wash water.
(Ord. 4445, passed 2-10-03; Am. Ord. 4446, passed 2-24-03; Am. Ord. 4646, passed 12-9-13; Am. Ord. 4648, passed 12-9-13)