Watering Index

What is the Watering Index?

  • An easy guide to using your irrigation controller when watering your yard.
  • Inform you of how much water your yard requires.
  • Provide you with monthly values that will adjust the time your yard is watered.

On the 1st of each month change the % key on your controller to the appropriate value for the month:

March 50%
April 70%
May 90%
June 100%
July 100%
August 90%
September 70%
October 50%

November is time to shut off your irrigation system for the winter!

November is time to shut off your irrigation system for the winter!


Where do the WI values come from?

  • These are percentages based on historical plant water needs data (evapotranspiration).
  • http://wwwcimis.water.ca.gov/cimis/welcome.jsp
  • Program designed by John Wynn.

What are the benefits of participating?

  • Using less water can result in:
  • Lower water bills
  • Less mowing because excess water accelerates lawn growth.
  • Less fertilizer because excess water can leach fertilizer from the root zone.
  • Less runoff onto sidewalks, driveways, etc.
  • Aid in water conservation.

Contact the Water Resources Association (WRA) at 637-4378 so you can:

  • Determine if your controller will work with the program.
  • Receive a free home water survey that includes a leak check, showerheads and faucet aerators (installed), hose nozzle, water softener assistance.
  • Receive free help from WRA personnel with setting up your irrigation schedule.