Folsom, CA Environmental Rules: Stormwater Management (2026)

110 makes it unlawful for any person to make or cause any nonstormwater discharge into the storm drain system, receiving waters, or a private storm drain system that will not prevent the discharge from reaching city drains or receiving waters. 140 separately prohibits discharging any pollutant to the city stormwater conveyance system or receiving waters that results in or contributes to a violation of the city's municipal stormwater permit, issued as NPDES Permit No. CAS082597 under a Sacramento County-area co-permittee agreement covering Sacramento, Folsom, Elk Grove, Citrus Heights, Rancho Cordova, and Galt.

120 exempts a specific list of common flows, including landscape irrigation, individual residential car washing, de-chlorinated swimming pool discharges, lawn watering, and street wash water, provided they do not cause or contribute to a receiving-water violation, and emergency firefighting flows are exempt outright under subsection C. 130 if the regional water board or the city's administrator finds it contributes to a water quality violation; the administrator must give 30 days' written notice before the exemption stops applying, except where an immediate threat justifies skipping the waiting period.

170 makes clear that a violation occurs regardless of the violator's negligence or intent. 200, and businesses already subject to a hazardous materials release response plan under California Health and Safety Code Section 25500 must fold stormwater compliance into that same plan.