Grading & Drainage: Bonsall vs San Marcos
How do grading & drainage rules compare between Bonsall, CA and San Marcos, CA?
Bonsall and San Marcos have similar restriction levels.
Bonsall, CA
San Diego County
San Diego County's Grading Ordinance (Division 7) requires permits for significant grading and mandates proper drainage design. Grading permits needed for 200+ cubic yards or 8+ foot cuts/fills. Drainage must be directed away from structures and neighboring properties.
View full Bonsall rules →San Marcos, CA
San Diego County
San Marcos requires grading permits for earthwork under SMMC Title 17. Projects must include drainage plans demonstrating that runoff will not adversely affect neighboring properties.
View full San Marcos rules →Key Facts Comparison
| Fact | Bonsall | San Marcos |
|---|---|---|
| Permit Threshold | 200+ cubic yards or 8+ ft cuts/fills | 50+ cubic yards |
| Drainage | Away from structures and neighbors | - |
| Plans Required | Licensed engineer for permit projects | - |
| Slopes | Specific angle and compaction standards | - |
| Ordinance | Division 7 — Grading, Clearing, Watercourses | - |
| Governing Code | - | SMMC Title 17 |
| Retaining Walls | - | Permit if over 4 ft |
| Drainage Study | - | Required with application |
Highlighted rows indicate differences between cities.
Bonsall FAQ
Do I need a grading permit in San Diego County?
Yes, if your project involves moving more than 200 cubic yards of material or if cuts or fills exceed 8 feet in vertical height. Smaller projects may still need permits depending on slope and location.
Can I direct drainage onto my neighbor's property?
No. Drainage must be properly designed to not increase runoff onto neighboring properties. Altering natural drainage patterns that cause damage creates civil liability.
Who prepares grading plans?
Grading plans for projects requiring permits must be prepared by a licensed civil engineer registered in California. Plans must comply with the County's Grading Ordinance design standards.
San Marcos FAQ
When do I need a grading permit in San Marcos?
A grading permit is required for earthwork exceeding 50 cubic yards or any grading that changes drainage patterns on your property.
Do I need a drainage study for my grading project?
Yes. The grading permit application must include a drainage study showing post-development runoff will not adversely affect neighboring properties.
What about retaining walls?
Retaining walls over 4 feet in height require a separate structural building permit with engineered plans.
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