San Francisco Public Utilities Commission, California, USA – Exploring different regional options for the future.

The PureWater Peninsula Project would generate up to 12 million gallons (45 million litres) per day of purified water. This project would convey treated wastewater from Silicon Valley Clean Water and the City of San Mateo to a new advanced water treatment facility to produce purified water that meets State and federal drinking water quality standards.

There are currently two project alternatives. The first would likely be implemented in two phases. In Phase 1, the project would produce up to 8 million gallons (30 million litres) per day of purified water, which would be conveyed to the San Francisco Public Utilities Commission’s Crystal Springs Reservoir where it would be blended with regional surface water supplies and then treated again at the San Francisco Public Utilities Commission’s Harry Tracy Water Treatment Plant.

In Phase 2, up to an additional 4 million gallons (15 million litres) per day of purified water would be produced and further treated at the advanced water treatment plant and then added directly to the distribution systems of other project partners in the region, who are San Francisco Public Utilities Commission wholesale customers, through treated water augmentation.

The second alternative to this two-phase concept is a single-phased project producing up to 12 million gallons (45 million litres) per day of purified water that can all be added directly to the Regional Water System through treated water augmentation.

The San Francisco Public Utilities Commission Draft Alternative Water Supply Plan