Anti-dam group questions Hetch Hetchy water

Environmentalists battling San Francisco’s use of Hetch Hetchy Valley as the city’s main drinking water cache are taking a new tack – raising questions about the water’s quality in light of higher-than-normal rates of certain parasitic infections.

But officials with the city’s water and public health agencies insist that the water is safe and that the group’s alarms have a political goal.

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