Fifteen Fifty

Luxury multifamily high-rise residential building

Fifteen Fifty is a 40-story luxury apartment building that is home to the first permitted and approved onsite greywater operation in San Francisco’s city history. Related, one of the largest real estate developers in the United States, implemented a pioneering water reuse approach both to comply with San Francisco’s Article 12C water reuse ordinance and to make an important sustainability statement at a moment when California was grappling with its worst drought in 1200 years . The residential tower also includes 40,000 square feet of retail space and a 12,000 square foot park.

San Francisco, CA
760,000 square feet
550 apartments
Collection Sources
Rainwater, greywater
System Capacity
7,500 gal/day
End Uses
Toilet flushing, irrigation

Project Partners

Related logo
21,326,500 gallons/year Total annual water demand
2,746,476 gallons/year Demand met by non-potable supply
$135,000+ annual savings Est. annual utility savings over the next 10 years

Sustainability and compliance at the forefront

The system installed at Fifteen Fifty and operated by Epic Cleantec is designed to recycle 7,500 gallons daily for reuse in the building’s toilet and urinal flushing. The system consists of an initial storage tank that captures greywater from showers, bathroom sinks, laundry, coupled with rainwater from the roof. After passing through an advanced purification process consisting of biological treatment, ultrafiltration membranes, and disinfection, the systems makes use of real-time monitoring technologies to verify that the recycled water meets the highest levels of cleanliness in order to safeguard public health.

Rainwater collected from the building roof is pre-filtered and directed to a separate concrete collection tank. Once full, it is pumped into the greywater collection tank where the two sources are combined for treatment. Potable make-up water is supplied to the treated water tank with an air gap to prevent cross-connection, while ensuring continuous water service to the building in the event of routine maintenance or interruptions to the system’s performance. The system has the capacity to recycle 7,500 gallons of greywater per day (or over 2.5 million gallons per year) and will save Related save more than $90,000 annually on utility costs over the next 10 years.

We are proud to partner with Epic Cleantec, a leader in water reuse technology and permitting.

Joe Walsh, Senior Vice President

We're thrilled to work with Epic to both lower our operating costs and to make a serious water conservation and sustainability impact.

Phoebe Yee, Executive VP of Design

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