Stormwater Management: Castro Valley vs Oakland
How do stormwater management rules compare between Castro Valley, CA and Oakland, CA?
Castro Valley and Oakland have similar restriction levels.
Castro Valley, CA
Alameda County
Alameda County complies with SF Bay Regional Water Board MRP 3.0. Projects disturbing 10,000 sf or more must incorporate Low Impact Development treatment per Provision C.3.
View full Castro Valley rules →Oakland, CA
Alameda County
Oakland enforces comprehensive stormwater management under the Oakland Municipal Code and the Municipal Regional Stormwater NPDES Permit (MRP) issued by the San Francisco Bay Regional Water Quality Control Board. The city's stormwater program protects San Francisco Bay and local creeks from polluted runoff.
View full Oakland rules →Key Facts Comparison
| Fact | Castro Valley | Oakland |
|---|---|---|
| Permit | MRP 3.0 (SF Bay Water Board) | - |
| C.3 threshold | 10,000 sf impervious | - |
| Single-family | 2,500 sf reduced threshold | - |
| Hydromodification | Over 1 acre | - |
| Local agency | Alameda Clean Water Program | - |
| Governing Permit | - | Municipal Regional Stormwater NPDES Permit |
| C.3 Threshold | - | 10,000 sq ft impervious (5,000 for some uses) |
| LID Required | - | Bioretention, pervious pavement, rain gardens |
| Fee Basis | - | Stormwater management fee |
| Penalty | - | Up to $10,000/day |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
Do I need stormwater treatment for my home addition?
Only if the project creates or replaces 2,500 square feet or more of impervious surface on single-family lots. Most small additions fall below this threshold but still must avoid illicit discharges.
Can I wash my car in the driveway?
Soapy runoff to storm drains is an illicit discharge. Use commercial car washes that recycle water or wash on gravel or lawn where runoff soaks in rather than entering the street.
Oakland FAQ
What triggers stormwater treatment requirements?
Projects creating or replacing 10,000+ square feet of impervious surface (or 5,000+ for auto service, restaurants, and certain uses) must include C.3 stormwater treatment and LID measures.
Does Oakland charge a stormwater fee?
Yes. Oakland charges a stormwater management fee to fund the city's Clean Water Program, which manages stormwater infrastructure and compliance.
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