Additional Resources

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California Reservoir Levels and Sierra Snow Pack Information:


Local Weather Reporting Stations from Weather Underground:

Click on any of the widgets below to get more detailed current and historical weather information for that location.

Weather Underground PWS KCAPORTO4 Weather Underground PWS KCAPORTO24 Weather Underground PWS KCAPORTO15 Weather Underground PWS KCAPORTO7 Weather Underground PWS KCAPORTO33 Weather Underground PWS KCAMENLO22 Weather Underground PWS KCAPORTO39 Weather Underground PWS KCAWOODS19


Drought Resource Investigator:

Use the new Drought Resource Investigator tool to get personalized recommendations on how you can reduce your water consumption. This tool has been developed to help Portola Valley residents conserve water and avoid paying surcharges for exceeding their water budget. After you sign up and give your consent, this tool will access your Cal Water historical consumption data. You will be asked a few questions about your household and landscaping. Then the tool will provide personalized recommendations for how you can reduce your water consumption. Here's how to get started:

  • click here
  • hit "Register" (in the upper right of the screen) and fill in all the fields
  • wait for an email, then follow the directions


Get Your Cal Water Historical Consumption Data (in CCF):

  • In your web browser, navigate to
  • Log in to your account (you'll have to set one up the first time, and you will need your account # and zip code)
  • Click on Customer Care
  • Choose Your Account
  • You will see a 12 month history graph with numbers over each bar
  • If you want to see 18, 24 or 36 months history, do this
    • click on Account Summary
    • scroll down and click on Consumption History
    • Choose the range you want (18, 24, or 36 months)


Calculate Your Household, Per Capita, and Landscape Water Consumption (in Gallons):

Click here for a worksheet to calculate your household, per capita, and landscape water consumption in gallons. You will need your Cal Water Historical Consumption Data from your monthly bill or from the Cal Water website (see above).

Click here for a generic water use estimator that will help you identify where your water may be going.

Click here for a worksheet to estimate your water bill during the summer months using the new water rates and water budgets. You will need your Cal Water Historical Consumption Data from the Cal Water website (see above).


Get Rebates for Conserving Water (some conditions apply):

  • BAWSCA (lawn replacement)
  • Cal Water (toilets, clothes washer, smart irrigation controller, sprinkler nozzles)


Water Conservation Programs and Classes:


River on Tap: Where Does Our Water Come From?

Portola Valley is serviced by Cal Water. The Tuolumne River is the primary source of water and is stored in Hetch-Hetchy Reservoir and locally in Calavaras and Crystal Springs Reservoirs. San Francisco Public Utilities Commission (SFPUC) is the wholesaler to Cal Water. Local surface runoff and groundwater typically account for 10% of supply. The drought has reduced the availability of local surface water supplies. Expect continued guidance on water conservation from water retailers as the year progresses. 

Learn about the Water Footprint of the Foods You Eat


Sites to Visit to Learn More about Water Conservation:



Recommended Reading:

  • "Water 4.0: The Past, Present, and Future of the World's Most Vital Resource" by David Sedlak
  • "The West Without Water: What Past Floods, Droughts, and Other Climatic Clues Tell Us about Tomorrow" by B. Lynn Ingram and Frances Malamud-Roam
  • "Your Water Footprint - The Shocking Facts About How Much Water We Use to Make Everyday Products" by Stephen Leahy
  • "Cadillac Desert: The American West and Its Disappearing Water", Revised Edition by Marc Reisner
  • "Dam Nation: How Water Shaped the West and Will Determine Its Future" by Stephen Grace