Stormwater Management: Castro Valley vs Livermore
How do stormwater management rules compare between Castro Valley, CA and Livermore, CA?
Castro Valley and Livermore 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 →Livermore, CA
Alameda County
Livermore is a Bay Area MRP 3.0 permittee; new/redevelopment projects 10,000+ sq ft must implement C.3 Low Impact Development stormwater treatment.
View full Livermore rules →Key Facts Comparison
| Fact | Castro Valley | Livermore |
|---|---|---|
| Permit | MRP 3.0 (SF Bay Water Board) | MRP 3.0 NPDES |
| C.3 threshold | 10,000 sf impervious | - |
| Single-family | 2,500 sf reduced threshold | - |
| Hydromodification | Over 1 acre | - |
| Local agency | Alameda Clean Water Program | - |
| Threshold | - | 10,000 sq ft triggers C.3 |
| Flood Agency | - | Zone 7 Water |
| Code | - | LMC Ch. 13.38 |
| Discharge Penalty | - | $1K-10K/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.
Livermore FAQ
Can I wash my car in the driveway?
Residential occasional washing is typically allowed, but runoff must not carry soap to storm drains — use biodegradable products or a car wash.
What's C.3?
C.3 is the MRP provision requiring LID stormwater treatment on new/redevelopment projects creating 10,000+ sq ft impervious area.
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