An estate agents http://keandra.in.net/ keandra Much of the San Francisco Bay area gets its water from the Hetch Hetchy reservoir behind O'Shaughnessy dam, including about 2.6 million customers in San Francisco and nearby towns. The famously pure water travels 160 miles entirely through gravity-fed pipes. As of Sunday morning there was no damage to the reservoir and the water was still clear and clean, despite fears that ash could fall into the reservoir. "The turbidity levels are fine," said Fleishman, referring to a measurement of particles in the water.