Erosion Control: Hesperia vs Ontario
How do erosion control rules compare between Hesperia, CA and Ontario, CA?
Hesperia and Ontario have similar restriction levels.
Hesperia, CA
San Bernardino County
Hesperia's SWMP requires Erosion and Sediment Control Plans (ESCPs) for construction sites, including single-family residences, to prevent sediment discharge into the Mojave River watershed. Projects disturbing one acre or more must enroll under the statewide Construction General Permit (Order 2022-0057-DWQ) via the State Water Board's SMARTS system and prepare a SWPPP signed by a Qualified SWPPP Developer. Standard BMPs include silt fences, fiber rolls, stabilized construction entrances, soil stockpile covers, and post-construction revegetation.
View full Hesperia rules →Ontario, CA
San Bernardino County
Ontario requires active erosion control on all graded sites year-round under OMC Chapter 5 Article VI, with enhanced Best Management Practices from October 1 through April 30 during the rainy season.
View full Ontario rules →Key Facts Comparison
| Fact | Hesperia | Ontario |
|---|---|---|
| CGP trigger | ≥1 acre of soil disturbance (Order 2022-0057-DWQ) | - |
| Local rule | Hesperia SWMP — ESCP required even for single-family residential construction | - |
| Required roles | Qualified SWPPP Developer (QSD) + Qualified SWPPP Practitioner (QSP) | - |
| Receiving water | Mojave River watershed (Lahontan Region) | - |
| Wet season | - | Oct 1 - Apr 30 |
| BMP examples | - | Silt fence, fiber rolls, tarps |
| Track-out | - | Clean daily |
| QSP | - | Required over 1 acre |
Highlighted rows indicate differences between cities.
Hesperia FAQ
Do I need a SWPPP for a 0.5-acre site in Hesperia?
No — the statewide Construction General Permit threshold is 1 acre of soil disturbance. However, Hesperia's SWMP requires an Erosion and Sediment Control Plan (ESCP) with BMPs (silt fences, stabilized entrance, sediment controls) for smaller sites, including single-family residential builds. Check with the Engineering Department.
What BMPs are typically required?
Stabilized construction entrance to prevent track-out, silt fence or fiber rolls along perimeter, soil stockpile covers, concrete washout containment, inlet protection for storm drains, and post-construction soil stabilization (revegetation, hydroseed, or rock cover) — per the city's SWMP construction handouts.
Ontario FAQ
Do I need erosion control on a small lot grading?
Yes, any disturbed soil requires BMPs under OMC Chapter 5 Article VI even on small residential projects.
What triggers a stop-work order?
Failure to install or maintain required BMPs, especially during rain events, can trigger an immediate stop-work order from Public Works inspectors.
Compare other topics
See how Hesperia and Ontario compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool