Erosion Control: Hesperia vs San Bernardino
How do erosion control rules compare between Hesperia, CA and San Bernardino, CA?
Hesperia and San Bernardino 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 →San Bernardino, CA
San Bernardino County
San Bernardino requires erosion and sediment controls on all grading and construction sites. Projects over 1 acre trigger the State Construction General Permit and a Stormwater Pollution Prevention Plan (SWPPP).
View full San Bernardino rules →Key Facts Comparison
| Fact | Hesperia | San Bernardino |
|---|---|---|
| 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) | - |
| SWPPP Threshold | - | 1 acre disturbed soil |
| General Permit | - | Order 2022-0057-DWQ |
| Rainy Season | - | October 1 to April 30 |
| PM10 Dust Rule | - | SCAQMD Rule 403 |
| Hillside Trigger | - | 10% slope |
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.
San Bernardino FAQ
Do I need a SWPPP for my San Bernardino home addition?
Single-family additions disturbing less than 1 acre generally do not need state permit coverage. You must still implement basic erosion controls such as silt fence, covered stockpiles, and a stabilized driveway entrance under San Bernardino grading rules.
Who enforces erosion control on San Bernardino construction sites?
San Bernardino Public Works inspects local sites for compliance with grading rules and street track-out. The Santa Ana Regional Water Quality Control Board enforces the State Construction General Permit, and SCAQMD enforces PM10 dust rules.
Compare other topics
See how Hesperia and San Bernardino 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