Stormwater Management: Menifee vs Moreno Valley
How do stormwater management rules compare between Menifee, CA and Moreno Valley, CA?
Menifee has fewer restrictions than Moreno Valley.
Menifee, CA
Riverside County
Menifee discharges urban runoff under Riverside County's NPDES MS4 permit. The city is a co-permittee in the Santa Margarita Region (San Diego RWQCB) for the southern Murrieta Creek/Santa Margarita watershed and the Santa Ana Region (Region 8) for the northern portion of the city. Developers must prepare a Water Quality Management Plan (WQMP) and follow Best Management Practices (BMPs) for construction-phase runoff. Illicit non-stormwater discharges (washwater, paint, oil, pool drainage with chlorine) to storm drains are prohibited.
View full Menifee rules →Moreno Valley, CA
Riverside County
Moreno Valley participates in the Santa Ana Regional Water Quality Control Board MS4 permit program. Discharging anything other than clean stormwater into storm drains is illegal. Construction sites over 1 acre require a state SWPPP, and car-washing, pool draining, and painting runoff are restricted.
View full Moreno Valley rules →Key Facts Comparison
| Fact | Menifee | Moreno Valley |
|---|---|---|
| Regulatory authority | Santa Ana RWQCB (R8) — north Menifee / San Diego RWQCB (R9) — south Menifee | - |
| Riverside County permit | Order R8-2010-0033 (Santa Ana) / R9-2013-0001 (Santa Margarita) | - |
| WQMP trigger | 10,000 sq ft new/redevelopment + priority projects | - |
| Design storm | 85th-percentile 24-hour event (LID retention) | - |
| Construction permit | State Construction General Permit at ≥1 acre disturbance | - |
| - | - |
Highlighted rows indicate differences between cities.
Menifee FAQ
Can I drain my pool to the street?
Only after dechlorination (no detectable chlorine) and pH neutralization (6.5–8.5), and only at a slow trickle that does not cause erosion. Chlorinated discharges are illicit and prohibited under both the Santa Ana and San Diego MS4 permits.
Do I need a SWPPP to build a house?
If your construction site disturbs 1 acre or more (including grading, staging, and stockpiles), yes — file a Notice of Intent on SMARTS and have a QSD prepare a SWPPP. Smaller sites still need a city-reviewed Erosion and Sediment Control Plan.
Does Menifee enforce its own stormwater rules or just the County's?
Menifee is a co-permittee, meaning it is directly responsible for enforcing the MS4 permit within city limits. Inspections, plan checks, and citations are handled by city Engineering / Public Works.
Moreno Valley FAQ
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