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USGS Washington Water Science Center

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Rick Dinicola,
934 Broadway,
Suite 300
Tacoma, WA 98402

(253) 552-1603
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Washington Non-Potable Aquifer

Project Summaries

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WA234 - Non-Potable Ground Water In Washington - Completed FY1982

Problem - The Safe Drinking Water Act requires EPA to develop minimum requirements for State programs to protect underground drinking-water resources. Part C of the Act, "Protection of Underground Sources of Drinking Water," allows each State to develop an enforceable underground injection control (UIC) program, for EPA approval. The agency responsible for development of such a program for Washington State is the Department of Ecology (DOE). To develop a UIC program, DOE needs an inventory of the aquifers in the State which contain non-potable water, and the probable cause of this non-potability.

Objectives - To assemble existing ground-water quality data to delineate those portions of the major aquifers in the State which contain non-potable water. The criteria by which this evaluation will be made will essentially be an evaluation of dissolved-solids concentration, fluoride, and nitrate.

Approach -

  1. Determine the available-data sources.
  2. Gather the desired data.
  3. Correlate the water-quality data with the major aquifers, noting areas where determined chemical constituents exceed recommended drinking-water standards. Isolated or localized situations will be expected and will not be considered.

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