Ground-water availability on the Kitsap Peninsula, Washington

Open-File Report 80-1186



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Unconsolidated deposits on the Kitsap Peninsula, Wash., are of glacial and interglacial origin. These deposits were divided into three units based on lithology and hydraulic properties. Two of the three units are composed of layers of sand and gravel , and silt and clay. The third unit consists of silt and clay and in most places separates the other two units. Water-bearing strata in the upper unit are fairly continuous and average 15 feet in thickness. The lower water-bearing strata are not believed to be as continuous as those in the upper unit, but yield larger quantities of water to wells. The silt-and-clay unit averages 70 feet in thickness, occurs generally near sea level, and is not known to contain major water-bearing deposits. The average annual ground-water recharge to streams on the Kitsap Peninsula was estimated to be 17 times the 1975 annual ground-water pumpage for the peninsula. Some, but an unknown amount, of this water is available for increased withdrawal by wells. Increased withdrawals cause decreased streamflow, declining water levels, and increased seawater contamination. There appears to be no widespread seawater contamination of wells in the study area. Local areas where chloride concentrations from wells exceed 25 milligrams per liter are near the southern part of the Longbranch Peninsula, Horsehead Bay, Point Evans, Sinclair Inlet, Eagle Harbor, Fletcher Bay, the northern end of Bainbridge Island, and the northern tip of the Kitsap Peninsula. (USGS)

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Ground-water availability on the Kitsap Peninsula, Washington
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Open-File Report
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U.S. Geological Survey,
v, 70 p. :maps ;28 cm.