Grading & Drainage: Mountain View vs Palo Alto
How do grading & drainage 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 requires a grading permit for any excavation or fill exceeding 50 cubic yards, any cut or fill over 4 feet deep, or work on slopes steeper than 3:1. Drainage must not cross property lines without easements.
View full Mountain View rules →Palo Alto, CA
Santa Clara County
Palo Alto requires grading permits for significant earthwork with drainage plans ensuring runoff does not harm neighbors or overwhelm stormwater systems.
View full Palo Alto rules →Key Facts Comparison
| Fact | Mountain View | Palo Alto |
|---|---|---|
| Permit threshold | 50 cubic yards | - |
| Depth trigger | 4 feet cut or fill | - |
| Slope trigger | Steeper than 3:1 | - |
| Soils report | Required for larger projects | - |
| Wall permit | Retaining walls over 4 feet | - |
| Permit Trigger | - | ~50 cu yd or deep excavation |
| Retaining Walls | - | Over 4 ft engineered permit |
| Drainage Plans | - | Required for grading permits |
| Neighbor Rights | - | Cannot divert water onto |
| Hillside Review | - | Geotech for steep lots |
Highlighted rows indicate differences between cities.
Mountain View FAQ
Do I need a permit to level my backyard?
Small grading under 50 cubic yards and less than 4 feet deep that does not alter drainage to neighbors is generally exempt. Larger projects or hillside work require a grading permit.
Can I redirect runoff to my neighbor's yard?
No. California common law and Mountain View code prohibit changing natural drainage in a way that harms neighbors. You may need a drainage easement for cross-lot flows.
Palo Alto FAQ
Do I need a permit for landscaping grading?
Minor landscaping below permit thresholds is typically exempt, but substantial regrading, new retaining walls over 4 ft, or drainage changes require permits.
What if a neighbor's grading floods my yard?
Report to code enforcement and document damage. Civil law holds neighbors liable for drainage changes that cause damage, in addition to potential code violations.
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