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Recycled Water

Recycled water is highly-treated wastewater that has been purified through multiple levels of treatment to meet stringent quality and safety standards set by the California Department of Public Health.

In 2004, as part of a partnership between the SFPUC and the City of Daly City, recycled water was made available to Lake Merced Golf Club, the Olympic Club Golf Course, and the San Francisco Golf Club by adding a tertiary level of treatment at the North San Mateo County Sanitation District (a subsidiary of the City of Daly City) Wastewater Treatment Plant located in Daly City, and by installing a distribution system from the treatment plant to these respective golf courses. Recycled water currently accounts for about 80% of the irrigation at these locations. This has markedly decreased the demand on local groundwater in the vicinity of Lake Merced.

In 2012, the Harding Park and Fleming golf courses began irrigating with recycled water also supplied by the North San Mateo County Sanitation District in Daly City.

Use of recycled water to irrigate the Harding Park and Fleming Golf Courses will decrease demand on San Francisco’s Regional Water System, provide a drought-resistant water source, and decrease wastewater discharges to the ocean. Recycled Water is now available for permitted use at the Recycled Water Truck Fill Station in San Francisco. To learn more, and apply for a Recycled Water Use Permit, please visit our Recycled Water Truck Fill Station page.

To learn more, please visit our page on Recycled Water Projects.

San Francisco Groundwater Supply Project


On an average day, the City of San Francisco – its residents, businesses, and visitors – rely on water supplies from the Hetch Hetchy and Bay Area Regional water supplies for its drinking water. Developing local groundwater can help diversify our water supply and ensure we have a local source for water should a drought, earthquake or other disaster interrupts the regional water supply.

The SFPUC is developing the San Francisco Groundwater Supply Project to provide 4 million gallons per day (mgd) of local, sustainable groundwater to supplement our drinking water. This 4 mgd supply will be a much needed addition to serve the City’s water needs and will assist in diversifying existing local water supplies. Learn more about our groundwater projects.

Groundwater is an essential part the state and the nation’s water supply. While San Francisco residents are not currently drinking groundwater, over 80% of Californians depend upon groundwater for all or part of their drinking supply, and have been doing so safely for generations.

Regional Groundwater Storage and Recovery Project

The proposed Regional Groundwater Storage and Recovery (GSR) project is part of our Water System Improvement Program (WSIP) and would benefit over 2.6 million people and businesses in the Bay Area by providing a local supply of water for use in times of drought. By storing water in wet years, when water supply is sufficient, this project builds a water savings account that can be tapped during dry years or in emergency situations such as an earthquake. The project is needed to meet our dry year regional water supply needs. Without the project, the SFPUC would be unable to fulfill the region's dry year water supply needs for its residents and would need to increase rationing above currently projected levels. Learn more about the project.

San Francisco Recreation and Parks -- Natural Areas Program

The Natural Areas Program (NAP) is the branch of San Francisco Recreation and Parks Department responsible for managing the City’s Natural Areas. The mission of the Program is two-fold: to preserve, restore, and enhance remnant Natural Areas, and to develop and support community-based site stewardship of these areas. Many parts of Lake Merced are managed by the Natural Areas Program. To learn more, please visit the NAP webpage and the Lake Merced page.

Last updated: 7/27/2018 9:41:41 AM