Stormwater Management: Carson vs South Gate

Can I wash my car in my Carson driveway?

Residential car washing where soap runs into the street/storm drain is technically a prohibited non-stormwater discharge under CMC Art. 4 Ch. 8. The city generally focuses enforcement on commercial car washes and industrial discharges, but residents are encouraged to wash on lawn/gravel or use a commercial wash that routes water to the sanitary sewer.

Do I need a stormwater permit for a small home addition?

Projects disturbing less than 1 acre typically don't trigger the state Construction General Permit, but Carson still requires erosion and sediment controls during construction under the local ordinance and the LA County MS4 permit. Larger redevelopment projects (varies by use; 5,000-10,000 sq ft impervious is a common LA County threshold) trigger Low Impact Development post-construction BMPs.

Who enforces stormwater rules at the Carson refineries?

Industrial facilities like the Marathon and Phillips 66 refineries are covered by the State Water Board's Industrial General Permit (Order 2014-0057-DWQ) and discharge under individual NPDES permits — primary enforcement is the LA Regional Water Quality Control Board, not the City of Carson, though city code enforcement can act on illicit discharges entering the MS4.

Can I wash my car in the driveway in South Gate?

Residential car-washing using biodegradable soap and minimal water that mostly evaporates or soaks into landscaping is generally tolerated. Heavy washing that sends soapy runoff down the gutter into a storm drain is an illicit discharge prohibited by Regional MS4 Permit Order R4-2021-0105 (Part III.A) and can be cited. Commercial mobile car-wash operators must use containment and capture wash water.

Where can I drain my pool?

Pool/spa water must be dechlorinated (chlorine below 0.1 mg/L), free of algaecides, pH-neutralized, and discharged slowly to the sanitary sewer (via a cleanout) — NOT to the gutter or a storm drain. Direct discharge of chlorinated pool water to the MS4 is a flat violation of Order R4-2021-0105 and Cal. Water Code §13260. Contact South Gate Public Works (8650 California Ave, (323) 563-9500) for a sewer-discharge protocol.

Does South Gate require a SWPPP for a home addition?

If the disturbed-soil area is under 1 acre, the state Construction General Permit does not apply — but South Gate's local permit will still require erosion and sediment BMPs (silt fence, gravel construction entrance, stockpile covers) under the Regional MS4 Permit's small-site construction requirements. Sites of 1 acre or more must file a Notice of Intent (NOI) with the State Water Resources Control Board for CGP Order 2022-0057-DWQ coverage before grading begins.