Santa Clarita, CA Environmental Rules: Stormwater Management (2026)

020 prohibits any illicit discharge into the city's municipal separate storm sewer system (MS4) unless it is authorized by an NPDES permit, tied to emergency firefighting, or exempted by an order of the Los Angeles Regional Water Quality Control Board, and requires that any lawfully discharged pollutant be reduced to the maximum extent practicable. 030 bans illicit connections to the MS4 and gives an owner 180 days from discovery to obtain a permit or remove one. 050 lists specific dumping prohibitions: no leaves, grass or landscape debris; no banned or unregistered pesticides, fungicides or herbicides; no oil, grease, or hazardous materials into litter containers; and no washing restaurant or automotive floor mats where the runoff reaches the MS4.

040 requires facilities subject to a state General Industrial Activities Stormwater Permit to keep their notice of intent, waste discharge ID number, SWPPP and BMP plan on site for inspection. 070 requires proof of a filed Notice of Intent and a stormwater pollution prevention plan before the city issues a grading or building permit on projects subject to the state Construction Activity Stormwater Permit, and separately bars sawcutting waste, street-maintenance runoff, and concrete truck washout from entering the MS4. 060 requires BMPs, such as regular sweeping, at commercial or industrial parking lots with more than 25 spaces exposed to stormwater. The chapter dates to Ordinance 03-05 in March 2003, with enforcement provisions amended by Ordinance 06-7 in 2006.