San Francisco Non-Potable Program Update John Scarpulla Water Resources Planner San Francisco Public Utilities Commission
Buildings Are Water Resources Precipitation collected from roofs and above- grade surfaces Wastewater from toilets, dishwashers, kitchen sinks, and utility sinks Precipitation collected at or below grade Wastewater from clothes washers, bathtubs, showers, and sinks Nuisance groundwater from dewatering operations
SFPUC Headquarters
Integrating On-site Non-potable Water Is Challenging • Regulatory questions: • Who should set water quality standards? • Who should issue permits and provide operational oversight? • What type of on-going monitoring and reporting should be implemented?
City Ordinance Streamlines Permitting Process SFPUC SFDPH SFDBI Program Administration Public Health Construction Review on-site non-potable Issue water quality & Conduct Plumbing Plan check water supplies & demands monitoring requirements and issue Plumbing Permit Administer citywide project Review and approve non- Inspect and approve system tracking & annual potable potable engineering report installations offset achieved Issue permit to operate on-site Provide technical support & systems outreach to developers Review water quality reporting Provide financial incentives to developers
SFPUC Assistance • On-site Non-potable Guidebook • Water Use Calculator • Grant program • Project review meetings
SFPUC Grant Program SFPUC offers up to $250,000 for individual buildings • Must be 100,000 sf or more • Must replace potable water for one of the following: • All toilet flushing demands or • Offset 40% of potable water use
11 New Projects Proposing to Offset 5.3 Million Gallons Per Year
Transbay Transit Center- 3.5 million gallon potable offset Transbay Transit Center Rainwater & graywater for toilets
Transbay Tower- 145,000 gallon potable offset Transbay Tower Rainwater for toilet flushing and irrigation
PG&E Building- 110,000 gallon potable offset PG&E Building Foundation drainage for toilets
AVA Apartment Building- 18,000 gallon potable offset AVA Apartment Building Rainwater for irrigation
Broadway Sansome- 180,000 gallon potable offset Broadway Sansome Affordable Housing Rainwater and stormwater for toilet flushing
Crescent Heights- 53,000 gallon potable offset Crescent Heights Apartment Building Rainwater for toilet flushing
Market Street Place- 370,000 gallon potable offset Market Street Place Rainwater for toilet flushing
Public Safety Building- 1.5 million gallon potable offset Public Safety Building Graywater, rainwater, & stormwater for toilet flushing, irrigation, and cooling
6 th Street Affordable Housing- 45,000 gallon potable offset 6 th Street Affordable Housing Rainwater for toilet flushing
Moscone Center Moscone Center Foundation drainage for multiple end uses on two parcels
Expand Program to Address District-Scale Water Systems Non-potable Ordinance amended, includes district-scale & requires: • encroachment permit process • legal agreements & easements between property owners SFPUC grant program expanded: • Offering up to $500,000 for multi- parcel projects that will utilize 3 MGY or more on-site
Thank You
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