Erosion Control: Rancho Cucamonga vs Rialto
How do erosion control rules compare between Rancho Cucamonga, CA and Rialto, CA?
Rancho Cucamonga and Rialto have similar restriction levels.
Rancho Cucamonga, CA
San Bernardino County
Rancho Cucamonga requires erosion control plans for grading over 50 cubic yards per Municipal Code Title 19. Plans must include BMPs effective through the October 1 to April 30 rainy season.
View full Rancho Cucamonga rules →Rialto, CA
San Bernardino County
Rialto requires erosion and sediment control Best Management Practices on all grading and construction sites under the California Building Code Appendix J (adopted in Title 15) and the city's grading ordinance. Projects disturbing 1 acre or more must obtain coverage under the State Construction General Permit (NPDES CAS000002) and implement a SWPPP. Wind-erosion (PM10) controls are also required by SCAQMD Rule 403 (Fugitive Dust) given Rialto's South Coast Air Basin location.
View full Rialto rules →Key Facts Comparison
| Fact | Rancho Cucamonga | Rialto |
|---|---|---|
| Threshold | 50 cubic yards | - |
| Rainy season | Oct 1 to Apr 30 | - |
| Plan required | Civil engineer | - |
| Citation start | 500 dollars | - |
| Contact | (909) 477-2740 | - |
| Grading code | - | CBC Appendix J via Rialto Title 15 |
| SWPPP threshold | - | 1 acre disturbed (Construction General Permit) |
| Fugitive dust rule | - | SCAQMD Rule 403 (any active disturbance >0.1 ac) |
| BMP standard | - | CASQA BMP Handbook |
| Penalties | - | Cal. Water Code §13385; SCAQMD Rule 403 enforcement |
Highlighted rows indicate differences between cities.
Rancho Cucamonga FAQ
Do I need erosion control for a small backyard project?
Projects under 50 cubic yards typically do not require a formal plan, but basic BMPs like silt fencing are still recommended during storms.
What if I start building in summer and finish after October 1?
You must have all erosion control BMPs installed and maintained by October 1, regardless of project completion status.
Rialto FAQ
Do small backyard grading projects need erosion control?
Yes. Even sites under 1 acre must use BMPs such as silt fences or fiber rolls at the downhill edge under Title 15 and SCAQMD Rule 403. A grading permit is required for cuts/fills exceeding CBC Appendix J thresholds (generally 50 cubic yards).
What is a SWPPP and who can write one?
A Storm Water Pollution Prevention Plan is required for any construction site of 1 acre or larger under the State Construction General Permit. It must be prepared by a Qualified SWPPP Developer (QSD) and implemented by a Qualified SWPPP Practitioner (QSP).
How long must erosion controls remain in place?
Until disturbed soil is permanently stabilized (70% vegetative cover or approved hardscape) and the Notice of Termination is approved by the State Water Board.
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