Grading & Drainage: Rialto vs San Bernardino
How do grading & drainage rules compare between Rialto, CA and San Bernardino, CA?
Rialto and San Bernardino have similar restriction levels.
Rialto, CA
San Bernardino County
Rialto regulates grading and on-site drainage through Title 15 (Buildings and Construction), which adopts California Building Code Appendix J. A grading permit is generally required for any earthwork exceeding 50 cubic yards, any cut or fill over 5 feet, or work that alters established drainage patterns. Drainage must convey runoff to an approved point of disposal without discharging concentrated flows onto adjacent property.
View full Rialto rules →San Bernardino, CA
San Bernardino County
San Bernardino requires grading permits for excavation or fill over 50 cubic yards or cut/fill over 3 feet. Positive drainage away from structures and downstream neighbors is required under the California Building Code.
View full San Bernardino rules →Key Facts Comparison
| Fact | Rialto | San Bernardino |
|---|---|---|
| Permit threshold | 50 cu yd or 5 ft cut/fill; any altered drainage | - |
| Code basis | CBC Appendix J via Rialto Title 15 | - |
| Engineering | Drainage plan stamped by CA civil engineer | - |
| Geotech | Soils report per CBC §1803 typical | - |
| Discharge rule | No concentrated runoff onto adjacent property | - |
| Grading Permit Trigger | - | 50 cu yd or 3 ft cut/fill |
| Foundation Drainage | - | 6 inch fall in 10 feet |
| Retaining Wall Permit | - | Over 4 ft height |
| Slope Trigger | - | Steeper than 3:1 |
| Drainage Law | - | Keys v. Romley reasonableness |
Highlighted rows indicate differences between cities.
Rialto FAQ
Do I need a permit to level my backyard?
Yes if the earthwork exceeds 50 cubic yards, cuts/fills exceed 5 feet, or you alter how stormwater flows to neighboring properties. Minor leveling under those thresholds may not need a permit but still must comply with drainage rules.
Can I direct gutter downspouts toward my neighbor's yard?
No. Concentrating roof or graded runoff onto adjacent property is prohibited under Cal. Civil Code §3479 (nuisance) and Rialto's drainage code. Use splash blocks, dispersal trenches, or connect to an approved storm drain.
How long does a grading permit take in Rialto?
Plan check for a residential drainage/grading permit typically runs 4-6 weeks depending on geotechnical review. Hillside or flood-zone projects take longer due to additional reviews.
San Bernardino FAQ
Do I need a grading permit for my San Bernardino backyard project?
If you move more than 50 cubic yards of dirt, cut or fill over 3 feet deep, or grade on slopes steeper than 3:1, a grading permit is required. Smaller landscaping work is typically exempt but must still maintain positive drainage and not harm neighbors.
Can my neighbor redirect runoff onto my property?
No. Under California drainage law (Keys v. Romley) adjacent owners must use reasonable care in modifying surface drainage. Concentrated runoff that causes damage can be remedied in Superior Court, and the San Bernardino Code Enforcement may enforce grading violations.
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