4S Ranch Park Biofiltration Project

Estimated Cost: $500k | Completed October 2025 | This project is in collaboration with the County of San Diego's Department of Parks and Recreation

Grey-Line

Located in the San Dieguito Watershed, this project improves water quality in Lusardi Creek and the San Dieguito River by removing trash and pollutants from stormwater runoff.

Learn how you can limit your watershed impact with our Educational Resources.

Learn more about the San Dieguito Watershed on Project Clean Water.

Grey-Line

Green Infrastructure elements of this project include:

Biofiltration Basin

4S-Ranch-Park

Biofiltration basins remove pollutants, such as bacteria and debris, from stormwater runoff by allowing the runoff to filter through native plants and soil. It is a natural process that improves water quality and provides benefits such as green space and flood reduction.

Drainage Improvements

4S-Ranch-Park

The Project constructed surface drainage improvements to direct 1.2-acres of untreated parking lot area into a new biofiltration basin. 

Grey-Line
County-Department-Group-DPW-RightRail

The County of San Diego is proud to implement projects like this to improve water quality, support sustainability, and enhance our local communities.

Grey-Line

Learn about our Other Green Infrastructure Projects

Or

Visit our Watershed Protection Program Home Page