The Irrigation Water Management Society
 is a non-profit organization
 committed to promoting
 the wise and efficient use of water
 in golf, landscape, and agriculture.
> Check out our Calculators
Regional weather data and calculators  

Estimate your water needs and create schedules for automatic watering systems

Seattle Area, Current Watering Index , Weekly Watering Forecast

You can have weather data and calculators for your region
 - click here for more info -

See how local news stations use the watering index to help conserve water
Classes & Exams  

Request a Certified Site Water Planner class and exam
 - click here for more info -
 Water Conservation Events  
Post your organization’s water conservation event on our Event Calendar
 - click here -
Certified Site Water Planner Program (CSWP)  
Professionals! obtain recognition and learn profitable skills for developing site water management plans
 - click here for more info -
NEW! Soil Moisture - ET Demonstration Project  
 - click here for more info -
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We are extremely grateful to the following organizations. Their commitment to water conservation and to the support of the IWMS is greatly appreciated: