Drinking water may be cloudy starting Monday for Castlewood, other customers of Hetch Hetchy Reservoir

Bubbles, cloudiness 'no cause for concern,' SF Public Utility says

Water customers in Pleasanton's unincorporated Castlewood community and other parts of the East Bay, South Bay, the Peninsula and in San Francisco may see some temporary cloudiness in their drinking water for the next couple months, a San Francisco Public Utilities Commission spokeswoman said Wednesday.

Starting Monday, some SFPUC customers, who include Castlewood users, may see tap water that appears cloudy or milky-white in color but is nevertheless perfectly safe to drink, spokeswoman Maureen Barry said.

Customers in the city of Pleasanton, which has its own water department and service, and those in Happy Valley who access their water supplier from individual wells, are not affected by the SFPUC advisory.

The change in the water is due to tiny air bubbles caused when an increased rate of flow from the agency's Sunol Valley Water Treatment Plant allows air to be mixed into the water.

If the water is allowed to stand for a few minutes, the cloudiness will dissipate as the air bubbles rise to the surface and break apart.

Due to maintenance on the regional water system, SFPUC customers are not receiving water from the Hetch Hetchy Reservoir in the Sierra Nevada, but rather local reservoirs in the East Bay and Peninsula.

The cloudiness is expected to dissipate when Hetch Hetchy supplies reach the Bay Area again after the completion of the work, which is scheduled to finish around Feb. 20, 2010.

Customers in Alameda and Santa Clara counties are most likely to see the cloudiness, according to Barry. As the water works its way through the system, up the Peninsula and into San Francisco, the air bubbles will not be as apparent, she said.

The SFPUC is emphasizing that the cloudy water is "nothing to cause concern," Barry said. The water continues to meet all state and federal regulatory requirements for water quality.

She said the same thing has happened in recent years, and although the agency did not receive many calls about the cloudy water last year, "it could happen, so we didn't want to alarm anyone if it does over the holidays."

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Like this comment
Posted by How remove water marks?
a resident of Danbury Park
on Dec 24, 2009 at 1:49 pm

Can someone please tell me how to get water marks, cloudy whitish deposits from the lawn sprinklers off my car? I had hoped the new filtration plant on Santa Rita would help, but it's just as bad, or worse than before.

Like this comment
Posted by D W
a resident of Another Pleasanton neighborhood
on Dec 24, 2009 at 4:23 pm

ARRRGH! How about showing a little respect for our Castlewood friends. I know I have two for my family, with some pretty good neighbors to boot. No more Rodney water treatment, please.

Like this comment
Posted by Mr. Cheney
a resident of Downtown
on Dec 29, 2009 at 5:37 pm

Water spots are from minerals in the water. The R.O. plant will make it better if you receive water from that source. If you do, it still is only a mix of the R.O. to Pleasanton's well water. Depending on the ratio of R.O. to well water will determine your mineral count in the water. The only thing you can do is wax your car and keep it away from having the water dry on it. White vinegar or CLR cleaner will help to remove what you already have on it. These help to break down the minerals off shower doors, faucets and car paint if needed.
Happy New Year to all!!

Mike Cheney
Valley Plumbing

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