Stormwater Management: Murrieta vs Riverside
How do stormwater management rules compare between Murrieta, CA and Riverside, CA?
Riverside has fewer restrictions than Murrieta.
Murrieta, CA
Riverside County
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).
View full Murrieta rules →Riverside, CA
Riverside County
Riverside is a co-permittee under the Santa Ana Region MS4 NPDES permit; only rainwater may enter storm drains, illicit discharges are prohibited, and new/redevelopment projects must submit a Water Quality Management Plan (WQMP) with Low Impact Development (LID) BMPs.
View full Riverside rules →Key Facts Comparison
| Fact | Murrieta | Riverside |
|---|---|---|
| - | - | |
| Permit type | - | Santa Ana Region MS4 NPDES (Order R8-2010-0033) |
| Receiving water | - | Santa Ana River watershed |
| WQMP required | - | New development and significant redevelopment |
| Design standard | - | Low Impact Development (LID) — infiltrate, harvest, ET, or bio-treat |
| Administering department | - | Public Works Engineering Stormwater Division |
Highlighted rows indicate differences between cities.
Murrieta FAQ
Riverside FAQ
Do I need a Water Quality Management Plan for a home remodel in Riverside?
Single-family remodels generally do not trigger WQMP requirements, but any project that disturbs soil must still install construction-phase erosion and sediment controls. Larger projects creating significant impervious area must submit a project-specific WQMP before discretionary approval. Check with Public Works Engineering at (951) 826-5341.
Can I wash my car in the driveway in Riverside?
The city discourages driveway car washing because soapy runoff flows untreated into storm drains and ultimately the Santa Ana River. Use a commercial car wash that recycles water, or wash on grass/gravel so runoff infiltrates.
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