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Los Altos Police Department
Sunday July 26th, 2015 :: 09:47 p.m. PDT


Drinking water warning issued by Cal Water. Map of impacted areas included.

California Water Service Company has issued a warning to several Los Altos neighborhoods to alert residents of a water contamination in the area. 

To view a map of the specific areas impacted, click here:

Per CalWater, E. coli and total coliform were found in your water supply on July 26, 2015. These bacteria can make you sick and are a particular concern for people with weakened immune systems. 


California Water Service (Cal Water) and the State Division of Drinking Water advise customers who reside on streets within the boundaries in the attached map to boil water for one minute or use bottled water for drinking, making ice, brushing teeth, washing dishes, and preparing food until further notice. Boiling kills bacteria and other organisms in the water. Customers should also discard ice cubes made from tap water or their refrigerator’s water line. If you have pets and are unsure about providing water to them during this advisory, please consult your veterinarian. Tap water is safe for showering, bathing, and other household uses. 

The positive samples were received after a main repair was made on Friday, July 24. Cal Water is currently conducting additional water quality testing and will inform you when you no longer need to boil your water. 

Cal Water expects to have test results on Wednesday, July 29. If you prefer to use bottled water, you may save your receipts for reimbursement by Cal Water. Read the full message from Cal Water (link above) for more information about how to be reimbursed. 

To view the full message issued by Cal Water, click here:

For more information, call Cal Water’s Customer Center at (650) 917-0152.

Los Altos Police Department
1 N San Antonio Rd
Los Altos, CA 94022

Emergency: 9-1-1
Non-emergencies: 650-947-2770

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