Murrieta is a co-permittee under the Riverside County MS4 NPDES permit issued by the Santa Ana and San Diego Regional Water Quality Control Boards. Residents and contractors must prevent non-stormwater discharges to the storm drain system, and construction projects disturbing one acre or more need a Construction General Permit (SWRCB Order 2022-0057-DWQ).
Murrieta participates in the Riverside County Flood Control and Water Conservation District's jurisdictional runoff management program under Clean Water Act section 402 and the applicable MS4 permits. Prohibited non-stormwater discharges to streets, gutters, and storm drains include soapy car-wash water from commercial operations, pool water, paint rinse, concrete slurry, pet waste in concentration, and landscape over-irrigation. Residential car washing in driveways is generally allowed if runoff is minimal. Construction projects disturbing one acre or more must obtain coverage under the State Water Board's Construction General Permit (Order 2022-0057-DWQ) and prepare a Storm Water Pollution Prevention Plan (SWPPP). Smaller projects must still implement best management practices (BMPs) such as gravel bag barriers, stabilized construction entrances, and concrete washouts per the Riverside County Construction Handbook. New development and significant redevelopment of 1 acre or more, or specific priority project categories, must implement Low Impact Development (LID) measures such as bioretention, pervious pavement, or on-site infiltration to meet hydromodification and water quality requirements. Illicit connections to storm drains are prohibited; residents can report violations to Murrieta Public Works.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Murrieta code enforcement directly for current fines, enforcement procedures, and hearing options.
Murrieta, CA
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Murrieta, CA
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