Environmental Rules in Rialto, CA (2026)
5 verified environmental rules for Rialto, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Rialto is a co-permittee on the San Bernardino County MS4 NPDES Permit issued by the Santa Ana Regional Water Quality Control Board (Order R8-2010-0036, NPDES No. CAS618036) and enforces stormwater quality controls under Title 13 (Public Services) of the Municipal Code. All non-stormwater discharges to the storm drain (including wash water, paint, oil, and sediment) are prohibited, and construction sites ≥1 acre require coverage under the Statewide Construction General Permit and a SWPPP.
Stormwater Discharge & MS4 Compliance (Rialto Title 13 / Santa Ana RWQCB Permit)
Heavy RestrictionsErosion Control
Rialto requires erosion and sediment control Best Management Practices on all grading and construction sites under the California Building Code Appendix J (adopted in Title 15) and the city's grading ordinance. Projects disturbing 1 acre or more must obtain coverage under the State Construction General Permit (NPDES CAS000002) and implement a SWPPP. Wind-erosion (PM10) controls are also required by SCAQMD Rule 403 (Fugitive Dust) given Rialto's South Coast Air Basin location.
Erosion & Sediment Control on Construction Sites (Rialto Title 15 / CGP)
Heavy RestrictionsCoastal Development
No local coastal development rule applies in Rialto. The California Coastal Act (Cal. Public Resources Code §30000 et seq.) and the Coastal Commission's permit jurisdiction extend only to the legally defined Coastal Zone along the Pacific Ocean. Rialto is located in the Inland Empire (San Bernardino County), approximately 60 miles inland from the nearest point of the Coastal Zone, and is entirely outside Coastal Commission jurisdiction.
Coastal Development Rules — Not Applicable in Rialto (Inland Empire)
Few RestrictionsFlood Zones
Rialto participates in the National Flood Insurance Program (NFIP, CID 060274) and enforces FEMA floodplain construction standards. Most of the developed city is in Zone X (minimal flood risk), but portions along the Cactus Basin, Lytle Creek wash, and tributaries of the Santa Ana River carry Zone A / Zone AE Special Flood Hazard Area designations under the San Bernardino County FIRM panels effective August 28, 2008. Construction in SFHAs requires elevation to or above base flood elevation (BFE) and a floodplain development permit.
FEMA Flood Zone Requirements & Floodplain Management (Rialto / NFIP)
Some RestrictionsGrading & Drainage
Rialto regulates grading and on-site drainage through Title 15 (Buildings and Construction), which adopts California Building Code Appendix J. A grading permit is generally required for any earthwork exceeding 50 cubic yards, any cut or fill over 5 feet, or work that alters established drainage patterns. Drainage must convey runoff to an approved point of disposal without discharging concentrated flows onto adjacent property.
Grading, Drainage & Site Permits (Rialto Title 15 / CBC Appendix J)
Some RestrictionsLooking for San Bernardino County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Rialto city rules.
Environmental Rules in San Bernardino County →