Grading & Drainage: Corona vs Riverside
How do grading & drainage rules compare between Corona, CA and Riverside, CA?
Corona and Riverside have similar restriction levels.
Corona, CA
Riverside County
Corona regulates grading and site drainage under Municipal Code Title 15 and California Building Code Appendix J. Grading permits are required for any project moving 50 or more cubic yards or altering drainage patterns. All sites must direct runoff to approved drainage systems without impacting neighbors.
View full Corona rules →Riverside, CA
Riverside County
Any project disturbing more than 50 cubic yards of soil in Riverside requires a grading permit under RMC Title 17, and lot drainage must be directed away from structures per California Building Code and RMC §17.28.010.E.
View full Riverside rules →Key Facts Comparison
| Fact | Corona | Riverside |
|---|---|---|
| - | - | |
| Code citation | - | Riverside Municipal Code Title 17 — Grading |
| Permit threshold | - | More than 50 cubic yards of soil disturbance |
| Drainage requirement | - | Direct away from structures (RMC §17.28.010.E + CBC) |
| Plan-check turnaround | - | 20 days first review / 10 days resubmittal |
| Architect sign-off limit | - | <5,000 cubic yards |
| Exemptions | - | RMC §17.12.010 (agricultural, pool excavation, minor engineered grading) |
Highlighted rows indicate differences between cities.
Corona FAQ
Riverside FAQ
Do I need a grading permit to level my backyard in Riverside?
If you will move more than 50 cubic yards of soil, yes — RMC Title 17 requires a permit. Smaller moves may be exempt under RMC §17.12.010, but you still must keep drainage flowing away from structures and prevent sediment from entering the storm drain.
How long does grading plan check take in Riverside?
Public Works targets 20 business days for first plan-check review and 10 business days for each resubmittal, whether the project is grading only or grading with a Water Quality Management Plan.
Can my neighbor regrade their lot so it drains onto mine?
No. RMC §17.28.010.E and the California Building Code require lot drainage to be directed away from structures and not concentrated onto adjacent properties. If approved plans show drainage onto your lot improperly, contact Public Works and Code Enforcement; civil nuisance remedies may also be available.
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