Just in Time for the Rainy Season

county of san diego watershed protection program


Lab sampling

Just in Time for the Rainy Season 

With the rainy season starting October 1st, The County of San Diego Department of Public Works Watershed Protection Program reminds all commercial facilities of the County’s Watershed Protection Ordinance (WPO) regulations.

Commercial wastes are among the many common stormwater pollutants that can degrade water quality. Stormwater runoff has been found to contain high concentrations of metals, organics, and oil and grease. When these pollutants wash into our waterways they can kill aquatic life. Metals such as chromium, cadmium, lead, and zinc can contaminate drinking water supplies as well as bioaccumulate in aquatic life. Engine degreasers, cleaners, and other solvents can also degrade water quality.


Review Best Management Practices (BMPs) in preparation for the rainy season.

Common rainy season BMPs include, but are not limited to:

  • Cleaning out storm drains and ditches
  • Maintaining equipment and vehicles to prevent leaks
  • Sweeping parking lots and outdoor work areas
  • Covering and berming equipment and materials stored outdoors,
  • Updating your facility’s Storm Water Pollution Prevention Plan (SWPPP).

Department of Public Works representatives may be visiting your facility to review BMPs and ensure compliance with applicable County ordinances and State stormwater regulations. Instances of non-compliance could result in the need to take stronger action, including administrative warnings and/or citations; however, our goal is to work with you to ensure that your facility is in compliance with County ordinances and State water quality regulations without the need for any stronger actions. We will gladly meet with you at your facility if you have any questions about any of these stormwater requirements.

Please visit http://sandiegocounty.gov/stormwater for stormwater pollution prevention information and resources that can help keep your facility in compliance.



Find My District


Report Stormwater Pollution
Report observed pollution to the correct jurisdiction.

Citizen Access Portal
Research property information and permits. Apply for some permits online.

GIS Maps
Find property information including zoning designation with our web-based mapping tool. 

Watershed Protection Website


project clean water

Project Clean Water efforts are focused on providing a centralized point of access to water quality information and resources for San Diego County Watersheds. Click HERE to visit Project Clean Water’s website. 

To learn more about the County of San Diego - Watershed Protection Program, please visit sandiegocounty.gov/stormwater