Local Water Utilities United for Safe Drinking Water

Studies & Reports

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Spokane County Watershed Planning
In 1998, the Washington State Legislature passed the Watershed Management Act to provide a framework for local citizens, interest groups, and governmental organizations to collaboratively identify and solve water-related issues in each of the 62 Water Resource Inventory Areas (WRIA) of the state. There are three WRIA areas designated in Washington that are impacted by the Spokane-Rathdrum Prairie Aquifer.

  • WRIA 55 – Little Spokane Watershed
  • WRIA 56 – Latah/Hangman Creek watershed
  • WIRA 57 – Middle Spokane Watershed

2007 Spokane Valley – Rathdrum Prairie Aquifer Study
This 90 page report details a computer model study of groundwater flow in the aquifer and the interactions between ground water and surface water. [Click on the image to download a pdf]

For historic information about this study, visit USGS Washington Water Science Center Projects SVRP Aquifer.

In 2002, Robinson Research, conducted a telephone survey of 500 residents in Spokane and Kootenai Counties to determine attitudes and perceptions regarding the Spokane Valley Rathdrum Prairie Aquifer. The 27 page Summary Report and 135 page database are provided here for the reader’s interest or for comparison research to determine if attitudes have changed since 2002.


Wellhead Protection Plan
The Spokane Aquifer Joint Board developed a comprehensive wellhead protection plan that includes a technical characterization and assessment of the hydrogeologic setting of the Spokane Aquifer and provides the basis for wellhead protection areas.Cover221px The wellhead protection areas serve as the foundation of the program, defining the areas for contaminant source inventory, risk assessment, contingency management, public education and possible groundwater protection ordinances. The report was prepared January 2000, by CH2MHill and funded in part by the Washington State Department of Ecology Centennial Clean Water Fund Grant No. G9600216, and the Spokane County Water Quality Management Program. Click here to read the Wellhead Protection Plan.


Groundwater Monitoring Reports
Since 1977, Spokane County has been monitoring water quality conditions in the aquifer. Currently Water Resources Program staff collects samples on a quarterly basis from 29 monitoring wells and 16 public supply wells.

Consumer Confidence Reports (CCR)
Have you ever wondered what’s in your water? Each year, water customer receives a CCR that tells you the water quality results of a regular, ongoing sampling effort of your drinking water. There are a number of elements in water, and safe levels have been determined by state and federal regulators.

Call your Water Provider and ask for your CCR. If you don’t know who that is, visit our Member Purveyor pages or locate your home or business on the Service Area Map.

The Washington DOH Source Water Assessment Program (SWAP) provides a variety of reports about protecting the source of your drinking water and any threats to its long-term quality that can be identified and addressed through pollution prevention.

A case study of the SAJB was conducted in 2003 and published in 2004, as part of the AWWARF funded “Demonstrating Benefits of Wellhead Protection Programs.” The published case study is not available however, a close to final draft of the case study is provided here.


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