Treasure Island residents can stop boiling their water after lab tests confirmed their tap water is safe to drink following a water main break, the San Francisco Public Utilities Commission said today.
Residents should flush their pipes and appliances before resuming use, officials said.
They should also run cold water taps at least one minute and hot water taps for at least five minutes, flush water dispensers with at least one quart of water and empty automatic ice dispensers and discard new ice for at least 24 hours.
An 18-inch cast iron water main broke Friday around 5 or 6 p.m., leaving the island without water until 7 a.m. Saturday. Even after water service was restored, residents were told to continue boiling water until tests could be concluded to determine its safety.
SFPUC spokeswoman Alison Kastama said the rupture appears to be the result of an aging pipe that is likely an original pipe part of the infrastructure built in the 1930s when the U.S. Navy inhabited the island.
The main that broke is the single water source for the island, she said.
Yerba Buena Island was not affected by the main break. Tap water on that island remained safe to drink.