Water Resources Division Annual Report - Fiscal Year 2017-18 WaterResourcesAR-FY17_18 | Page 9

Local Water Supplies (continued)
We are excited to partner with our community on large non-potable projects, such as Warriors Arena, NRG
Energy Center, 181 Fremont, and the Salesforce Tower.
WARRIORS ARENA
Chase Center, the sports and entertainment complex to be built in the Mission Bay neighborhood, is being
designed to collect and treat rainwater, stormwater, graywater, and condensate to supply toilet flushing
demands in the arena and two accompanying office buildings. The project is applying an integrated
approach by combining the infrastructure needed for both onsite reuse and stormwater management, and
will offset about 3.7 million gallons per year.
NRG
Beneath the crowds of people that visit Union Square every day, there is an untapped water source that
flows directly under Powell Street BART station. NRG Energy Center San Francisco and BART are partnering
on a unique project to bring that underground resource to the surface. With support from the SFPUC’s Non-
potable Grant Program, NRG is implementing a project that will reclaim the foundation drainage at the
Powell Street BART station and redirect it to their District Energy Plant located nearby on Jessie Street for
use in the downtown steam loop. With this project, NRG will be able to reduce their overall potable water
use by 15 million gallons per year.
181 FREMONT
SALESFORCE TOWER
The Salesforce Tower located at 415 Mission
Street will feature an onsite blackwater
treatment system in one of the largest
commercial high-rise buildings in the United
States. With support from the SFPUC’s Non-
potable Grant Program, the Salesforce Tower
will collect and treat blackwater from sources
such as showers, sinks, and urinals, to be reused
for non-potable applications such as irrigation
and toilet flushing. The system will reduce the
building’s potable water consumption by 76%,
saving roughly 7 million gallons per year.
The 70-story mixed-use tower located at 181
Fremont is an example of modern design and
sustainability in a high-rise project. The tower
includes an onsite water system which will capture,
treat, and reuse graywater and rainwater. With
support from the SFPUC’s Non-potable Grant
Program, graywater will be collected from the
bathroom sinks on the residential and commercial
office floors, while rainwater will be captured from
the roof of the building. The project will offset
1.3 million gallons per year.
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