J.C. Ebbert 1984 <p>In 1979 the quality of ground water in major aquifers in northeastern-north central Washington State was assessed in terms of inorganic-chemical, trace-metal, and fecal-coliform concentrations. For the Spokane Valley aquifer some organic-chemical data were also included. Results of this assessment indicate that the ground water in the region is generally suitable for most uses.</p> application/pdf 10.3133/wri834102 en U.S. Geological Survey The quality of ground water in the principal aquifers of northeastern-north central Washington reports