Redwood City, California

Redwood City, California Redwood City, California

Water Quality in Redwood City, California

Watershed: San Francisco Bay Estuaries

What is the water quality like in Redwood City, CA?

Let’s dive deeper into what’s in Redwood City water.

What’s in Redwood City water?

Here are the top 5 chemical compounds in your water and what health issues they can potentially cause:

  1. Bromodichloromethane – Potential effect: Cancer
  2. Chloroform – Potential effect: Cancer
  3. Dichloroacetic acid – Potential effect: Cancer
  4. Haloacetic acids – Potential effect: Cancer
  5. Total trihalomethanes – Potential effect: Cancer

These are five of the 16 contaminants analyzed by the Environmental Working Group (

6 of these contaminants are rated as exceeding EWG Health Guidelines.

See the What Can You Do? section below for all of the contaminants you can filter out and how to do it.

Where does Redwood City’s water come from?

Redwood City’s water comes from the San Francisco Bay Estuaries watershed.

21 of the 26 EPA assessed water sources in the San Francisco Bay Estuaries watershed are in Impaired or Unknown condition. These include:

  • Adobe Creek
  • Alameda Creek
  • Aquatic Park
  • Arroyo Viejo Creek
  • Candlestick Point
  • Coyote Creek
  • Damon Slough
  • Elizabeth Lake
  • Guadalupe River
  • Guadalupe Slough
  • Kiteboard Beach
  • Lakeshore Park Beach
  • Matadero Creek
  • Old Alameda Creek
  • Oyster Point Marina
  • Permanente Creek
  • San Francisco Bay – South
  • San Francisquito Creek

Ideally, a water source would be rated in Good condition. Artestian Slough, Marina Lagoon, Moffett Channel, Redwood Creek, and a section of San Francisco Bay are in Good condition.

Whether a water source is in Impaired or Good condition refers to the quality of these uses:

  1. Drinking Water
  2. Aquatic Life
  3. Fish and Shellfish Consumption
  4. Recreation

Learn more from How’s My Waterway

See below for what you can do to improve Redwood City’s water.

Conclusion – What Can You Do?

Information about water quality can be surprising.

But there’s no reason to lose hope. There are things you can do in your household as well as things you can do at a community level.

In Your Household:

  • Use Berkey filters with activated carbon to filter out 14 of the 16 contaminants in your drinking water. (Berkey Light and Travel Berkey are the only types available in California.)
    • Berkey filters can also remove up to 99.99% of Lead in Redwood City water.
    • Brita can filter 9 (and Lead depending on the filter).
    • Note: We may receive a commission if you decide to purchase filters through links on this page.
  • To filter out 14 of the 16 contaminants in your whole house, consider a Reverse Osmosis water filtration system for your home.

*Chlorination is an effective method of disinfecting/treating drinking water. You can then use a water filter to reduce the effects of chlorination byproducts to get the safest, cleanest water possible.

In Your Community:

Contact your local government officials and put pressure on them to invest in cleaner waterways and upgraded city water filtration and treatment.

Go to: to find contact information for your local officials.

Water Quality in Other California Cities

California Water Quality Page

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