Stormwater Management: Riverside vs Temecula
How do stormwater management rules compare between Riverside, CA and Temecula, CA?
Riverside and Temecula have similar restriction levels.
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 →Temecula, CA
Riverside County
Temecula Municipal Code Chapter 8.28 prohibits non-stormwater discharges into the MS4 storm drain system, which flows untreated into Murrieta Creek and the Santa Margarita River. Property owners must implement BMPs to prevent pollutants from entering storm drains. Construction sites disturbing 1+ acre require a SWPPP and coverage under the State Construction General Permit. Violations carry fines up to $1,000 per day.
View full Temecula rules →Key Facts Comparison
| Fact | Riverside | Temecula |
|---|---|---|
| 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.
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.
Temecula FAQ
Can I wash my car in the driveway?
Yes, but use biodegradable soap and minimize runoff. Commercial car washes recycle water and are preferred. Charity car washes need a permit and a discharge plan.
What if I see someone dumping into a storm drain?
Report it immediately to Temecula Public Works (951-694-6411) or the 24/7 hotline. Note the location, vehicle, and substance. The City investigates all reports.
Do small home projects need stormwater controls?
Projects under 1 acre don't need a SWPPP, but you must still prevent sediment and debris from entering storm drains using fiber rolls, gravel bags, or covering stockpiles.
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