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Napa, CA
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Water FAQs

Find answers to Frequently Asked Questions (FAQs) for various drinking water topics. Topics and content are continually added below.

Special Notices

  1. Will PG&E planned power outages affect my water service?
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Disinfection Byproducts/Home Filters

  1. I’ve never heard of disinfection byproducts before, so why am I hearing about this now?
  2. Why do we need to add chlorine to the water?
  3. What is a THM and how is it formed?
  4. How much is a ug/l?
  1. What about other water systems?
  2. What can I do to lower the THMs at my tap?
  3. Are personal home filters effective?
  4. Should I drink bottled water instead?
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    955 School Street
    Napa, CA 94559
    Phone: 707-257-9500
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