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SFPUC details regional water-supply planning, defends 8.5-year design drought

San Francisco Public Utilities Commission · October 28, 2025
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

Assistant General Manager Steve Ritchie told the commission San Francisco relies on the Tuolumne River for 85% of its water, uses an eight-and-a-half-year design drought as a planning stress test, and is advancing studies of purified-water and groundwater projects while weighing affordability and rate impacts.

San Francisco — At a San Francisco Public Utilities Commission meeting, Assistant General Manager for Water Steve Ritchie outlined the agency’s multi-decade water-supply planning framework and defended the use of an 8.5-year design drought as a conservative modeling tool.

Ritchie told commissioners that about 85% of San Francisco’s supply comes from the Tuolumne River and that the city relies on stored water because its Tuolumne rights are junior in dry years. He said the utility’s long-term planning emphasizes ‘‘Water First’’ — prioritizing supply for drinking water and public health over hydropower — and uses an 8.5‑year drought sequence derived from the 1987–1992 drought as a stress test in environmental review and project modeling. "The consequences…

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