Stormwater Management: Bonsall vs San Marcos
How do stormwater management rules compare between Bonsall, CA and San Marcos, CA?
Bonsall and San Marcos have similar restriction levels.
Bonsall, CA
San Diego County
San Diego County adopted the Watershed Protection, Stormwater Management, and Discharge Control Ordinance (WPO) in 2016. The ordinance prohibits pollutant discharge to storm drains and requires stormwater management for development projects. All properties must prevent illicit discharges.
View full Bonsall rules →San Marcos, CA
San Diego County
San Marcos enforces strict stormwater management under its Municipal Separate Storm Sewer System (MS4) permit and SMMC Chapter 14.15. New development and redevelopment must incorporate post-construction BMPs.
View full San Marcos rules →Key Facts Comparison
| Fact | Bonsall | San Marcos |
|---|---|---|
| Ordinance | Watershed Protection Ordinance (2016) | - |
| Discharge | Pollutant discharge to storm drains prohibited | - |
| Development | SWQMP required for qualifying projects | - |
| Construction | Erosion/sediment control BMPs required | - |
| Manual | County Stormwater Standards Manual | - |
| Governing Code | - | SMMC Chapter 14.15 |
| MS4 Permit | - | SD Regional Order R9-2013-0001 |
| PDP Threshold | - | 5,000 sq ft impervious |
| SWQMP | - | Required for new development |
Highlighted rows indicate differences between cities.
Bonsall FAQ
What is the stormwater ordinance in San Diego County?
The Watershed Protection Ordinance (WPO) prohibits pollutant discharge to storm drains and requires stormwater management for development projects. It was adopted in 2016 to protect water quality.
Do I need a stormwater plan for my construction project?
Development projects of certain sizes must prepare Stormwater Quality Management Plans (SWQMPs). Check the County Stormwater Standards Manual for thresholds and requirements.
Can I wash my car and let water run into the storm drain?
No. Wash water containing soap, oil, and chemicals should not be discharged to storm drains. Use a commercial car wash that recycles water or wash on permeable surfaces where water can infiltrate the ground.
San Marcos FAQ
When is a stormwater plan required in San Marcos?
A Storm Water Quality Management Plan is required for new development and significant redevelopment projects, with Priority Development Projects triggering additional hydromodification requirements.
Can I discharge pool or wash water into the storm drain?
No. Illicit discharges to the storm drain system are prohibited under SMMC Chapter 14.15. Pool water must be dechlorinated and discharged to the sanitary sewer.
What BMPs are required for construction in San Marcos?
Construction sites must implement a SWPPP with erosion control, sediment barriers, material storage BMPs, and good housekeeping practices.
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