Stormwater Management: Mountain View vs Palo Alto
How do stormwater management rules compare between Mountain View, CA and Palo Alto, CA?
Mountain View and Palo Alto have similar restriction levels.
Mountain View, CA
Santa Clara County
Mountain View enforces MRP 3.0 requiring C.3 treatment for projects creating 5,000 sq ft or more of impervious surface. Illicit discharges to storm drains are prohibited and fined.
View full Mountain View rules →Palo Alto, CA
Santa Clara County
Palo Alto regulates stormwater under its NPDES MS4 permit and the Municipal Regional Permit, with development and redevelopment projects required to manage runoff via Low Impact Development (LID).
View full Palo Alto rules →Key Facts Comparison
| Fact | Mountain View | Palo Alto |
|---|---|---|
| Permit authority | MRP 3.0 Bay Area | - |
| C.3 threshold | 5,000 sq ft impervious | - |
| Design storm | 85th percentile rainfall | - |
| Illicit discharge | Prohibited, fines apply | - |
| Receiving waters | Stevens Creek, Permanente Creek | - |
| Permit Framework | - | NPDES MS4 MRP |
| Treatment Threshold | - | 2,500 sq ft impervious |
| LID Required | - | Bioretention and on-site treatment |
| Construction Permit | - | SWPPP for 1+ acre sites |
| Illicit Discharge | - | Prohibited, civil penalties |
Highlighted rows indicate differences between cities.
Mountain View FAQ
Do I need stormwater treatment for a home addition?
Single-family additions creating over 2,500 sq ft of new impervious surface trigger Small Project requirements like directing roof runoff to vegetated areas. Projects under 2,500 sq ft generally are exempt.
Can I wash my car in the driveway?
Residential car washing with biodegradable soap is allowed, but runoff should be directed to landscaping, not the storm drain. Commercial car washing must occur at licensed facilities.
Palo Alto FAQ
Do I need stormwater treatment for a home addition?
Projects adding or replacing less than 2,500 sq ft of impervious surface are typically exempt from C.3 requirements, but basic best practices still apply.
Can I wash my car in my driveway?
Residential car washing with soap should be done on permeable surfaces or avoided to prevent soap from entering storm drains. Commercial car washes are preferred.
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