Quality of ground water in the Puget sound region, Washington, 1981

Water-Resources Investigations Report 84-4258



Groundwater from more than 100 sites in the Puget Sound region, Washington, was sampled and analyzed in 1981 for pH, specific conductance, and concentrations of fecal coliform bacteria, major ions, and dissolved iron, manganese, and nitrate. 20% of the samples were analyzed for concentrations of dissolved trace metals including aluminum, arsenic, barium, cadmium, chromium, copper, lead, mercury, selenium, silver, and zinc. The predominant water types were calcium bicarbonate and calcium-magnesium bicarbonate. Some wells in San Juan and Island Counties contained sodium chloride as a result of seawater intrusion. Dissolved solids concentrations were generally < 150 mg/L. Iron concentrations > 300 micrograms/L in 14% of all samples. Manganese concentrations > 50 micrograms/L in 40% of all samples. Trace-metal concentrations were generally < 10 mg/L , except for barium, copper, lead, and zinc. Nitrate concentrations were < 1.0 mg/L in water for over 75% of the sites. Concentrations > 1.0 mg/L in samples from Skagit, Whatcom , and Pierce Counties, were probably due to agricultural activities or septic tanks. Fecal coliform bacteria were detected in isolated instances. EPA drinking water regulations were exceeded only in isolated instances, except for widespread excessive iron and manganese concentrations. The historical data for the region were also evaluated for the same constituents. There are quantitative differences between historical and 1981 data, but they may be due to inconsistencies in data collection and analytical methods. (Author 's abstract)
Publication type Report
Publication Subtype USGS Numbered Series
Title Quality of ground water in the Puget sound region, Washington, 1981
Series title Water-Resources Investigations Report
Series number 84-4258
DOI 10.3133/wri844258
Edition -
Year Published 1986
Language ENGLISH
Publisher U.S. Dept. of the Interior, Geological Survey ; Open-File Services Section, Western Distribution Branch,
Description v, 170 p. :ill., maps ;28 cm.
Google Analytic Metrics Metrics page
Additional publication details