About our website

IWMS provides simple tools to improve the efficiency of automatic irrigation systems.  Brought to you by the Saving Water Partnership and Seattle Public Utilities.

Irrigation Controller/Clock Water Saving Features & Tips

To help save water and keep plants healthy, learn how the water saving features on common irrigation controllers work.  


If you have an event that you would like to list, just click here to submit it to IWMS for listing.

The events listed here are only for national or international events that deal with the wise and efficient use of water in golf, landscape and agriculture.

There are currently no events listed with the IWMS, please check back soon.





The use of the weather network constitutes your acceptance to these terms of use .

Puget Sound Weather Network Map

(only New Seattle Center weather station data is up to date)

Current locations on the network:
links:  Seattle/King County Irrigation Info

For more infomation about the Landscape Weather Network click here. ET for this site is calculated using the ASCE Standardized ET Equation.

Terms of Use

This data is provided at no cost to the user. The user accepts all responsibility and agrees to hold harmless the IWMS, Seattle Public Utilities, the Saving Water Partnership and the owner/operators of the weather stations of the PNWLWN (Providers) in case of errors with this data obtained from this website. The Providers shall not be responsible for any damages, direct or indirect caused by the use of this site or the weather data displayed herein. The user agrees that there is a potential risk involved with the use of this data and that errors can occur with the technology (or human error) used to supply and calculate this data.
The user witnesses that they have read and agree to these terms.