San Francisco

San Francisco Water Reuse Regulations

In July 2015, the City and County of San Francisco amended Article 12C, commonly known as the Non-Potable Water Ordinance. This amendment requires the installation of onsite water systems for new development projects of 250,000 square feet or more located within San Francisco’s designated recycled water use areas. Beginning November 1, 2015, all new development projects must install onsite water systems to treat and reuse available alternate water sources for toilet flushing and irrigation. This requirement expands to the entire city on November 1, 2016.

Six Steps for Successful Implementation of Onsite Water Systems

  • Submit a Water Budget Application and Non-Potable Calculator to the SFPUC
    Assess water supplies and non-potable water demands
  • Submit an Engineering Report to the SFDPH
    Provide detailed design and technical aspects of the onsite water system
  • Obtain Permits from the DBI and Complete Construction
    Adhere to construction and plumbing code requirements to ensure proper installation
  • Schedule a Cross Connection Test with the SFPUC
    Ensure separation of potable and non-potable water systems
  • Obtain a Permit to Operate from the SFDPH
    Provide required documents to the SFDPH, pay first annual license fee to the Tax Collector, and begin operating the onsite water system with SFDPH oversight
  • Conduct Ongoing Monitoring, Reporting, and Inspections
    Keep your system in compliance with water sample collection, ongoing maintenance, routine reporting to the SFDPH, and timely payment of the annual license fee

Projects must be in compliance with the following:

“All toilet and urinal flushing and irrigation demands shall be met through the collection and reuse of available onsite rainwater, graywater, and foundation drainage, to the extent required bv the SFPUC Water Budget Application and SFPUC Water Use Calculator. Projects can voluntarily use blackwater or stormwater if desired.”

“If the available supply from onsite sources exceeds the demands for toilet and urinal flushing and irrigation based on the Water Budget Application, 100% of those demands shall be met by using the available onsite sources. If all toilet and urinal flushing and irrigation demands cannot be met with the available supply from the onsite sources, all of the supply must be applied towards meeting as much demand as possible.”

The San Francisco guidelines for water reuse are available as SFPUC_Guidelines_Water_Reuse-2017.pdf (223 downloads)

Water Harvesting Systems from Wahaso

With 25+ years experience in water harvesting system design and implementation, we are experts in systems for large buildings. It is our core competencies in system design, filtration, control systems, our experience, and our focus on only the commercial and institutional building market that set us apart from other rainwater or greywater system suppliers.

Wahaso is an approved vendor in the state of California that can combine stormwater management and greywater reuse into an integrated commercial water harvesting system. Wahaso’s systems are compliant with NSF-350 standards and all local codes, including all new regulations. As members of the U.S. Green Building Council (USGBC), we understand the broader goals and concerns of clients interested in achieving LEED certification for their building, and we can actively support the design and documentation of a water harvesting approach to maximize LEED points in this area.

Ready to take the next step? We provide a free water balance assessment, system recommendation, and a free consultation on options and implications. To get started, contact us today.