Orange Memorial Park Regional Stormwater Capture Project Ribbon Cutting

From left to right: prior SSF Mayor – Karol Matsumoto, SSF City Manager – Mike Futrell, SSF Vice Mayor – Beunaflor Nicolas, Caltrans District 4 Chief Deputy District Director – Dave Ambuehl, SSF Mayor – Mark Nogales, Assemblymember – Kevin Mullin, C/CAG Chair – Davina Hurt, Councilmember – Mark Addiego, San Mateo County Supervisor – Dave Pine, SSF Councilmember – James Coleman.

An exciting new stormwater project was recently completed in May 2022! The Orange Memorial Park Regional Stormwater Capture Project is designed to capture, treat, and filter stormwater to remove contaminants. The water will then be used to irrigate the park and recharge the groundwater aquifer.

200 Million Gallons of Water

*Image from the* *Orange Memorial Park Educational Placard*

Rain falling east of the Santa Cruz Mountain range drains into the San Francisco Bay. Also called stormwater runoff, this rain may carry trash and other pollutants with it as it flows to the San Francisco Bay. One of the waterways that carries this runoff is Colma Creek, which drains over 6,500 acres of land in Colma, Daly City, Pacifica, South San Francisco, and San Bruno. A portion of the Colma Creek runs through Orange Memorial Park where the newly completed regional stormwater capture project will be able to capture, treat, and reuse 200 million gallons of water each year!

*Schematic of water flow and cleaning processes in and around Orange Memorial Park courtesy of the City of South San Francisco.*

What Are The Benefits of the Orange Memorial Park Project?

This project, the first-of-its-kind in Northern California, will divert and capture stormwater from the Colma Creek Watershed.

Some of the benefits of this project include:

Cleaning and saving water for non-potable use: Water from Colma Creek will be diverted and treated to remove trash, sediment, and pollutants such as mercury and polychlorinated biphenyls (PCBs). It will then be stored in a cistern underneath the park for further disinfection and used for irrigation and other non-potable water use. This will save over 15 million gallons of potable water each year, all while reducing local flood risk.
Recharging groundwater: Once the cistern is full, additional water will be infiltrated into the Westside Groundwater Basin, recharging 55 million gallons of groundwater each year. Groundwater recharge is an important water management practice in California because groundwater has been overused in recent decades, leading to dry wells, sinking land, and saltwater intrusion from the ocean.
Protecting the environment: When the underground water storage system is full, 130 million gallons of cleaned water will be returned to Colma Creek, improving the water quality in the creek and Bay. This will prevent pollutants such as mercury and PCBs—which are harmful to humans and wildlife—from polluting the San Francisco Bay.
Renovating the athletics field: In Phase 2 of this project, the Orange Memorial Park athletics field will be renovated, something the community has long been advocating for. This will enhance recreational opportunities for the local community, providing a space for baseball, softball, and soccer.

Now that the project is completed, what’s next?

Construction on this stormwater capture project began in early 2021 and was completed May 2022, with the official ribbon cutting happening on June 10, 2022. The project was led and constructed by the City of South San Francisco, with funding provided by Caltrans. Details on the project can be found here.

In 2023, Phase 2 of this project will begin. In line with the City’s Capital Improvement Program, the sports field above the water treatment facility will be rebuilt with improvements. More information on Phase 2 can be found here.