San Ramon, CA Environmental Rules: Stormwater Management (2026)

Section B6-365 makes it unlawful to release any non-stormwater discharge into the city's storm drain system, and separately prohibits any discharge from a property or activity that causes or contributes to a violation of the city's NPDES permit receiving-water limitations. Section B6-364 requires a stormwater control plan for rezonings, tentative maps, parcel maps, conditional use permits, variances, site development permits, design review, or building permits that trigger the city's NPDES development runoff thresholds; the approved plan and an operation-and-maintenance plan must be in place before the city issues a certificate of occupancy.

Facility owners must inspect stormwater management facilities at least annually unless the approved plan sets a different schedule, and must record covenants or easements letting the city, the Contra Costa Mosquito and Vector Control District, and the Regional Water Quality Control Board access the facility. Section B6-367 separately bars unauthorized drainage connections and discharges that cause floating matter, foam, algae growth, temperature or oxygen changes harmful to aquatic life, visible oil sheens, or concentrations toxic to wildlife. Section B6-368 requires businesses such as gas stations, parking lots and industrial sites to adopt best management practices to the maximum extent practicable, and separately makes it unlawful to litter into any street, alley, sidewalk, creek or storm system. The director of engineering services (or designee) administers the chapter and enforcement officers are authorized to inspect premises for compliance.