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May 2001
Finding Water
Geology and Ground Water Conditions in Napa County
by E. H. Boudreau
To drill successful water wells, it is necessary to drill into permeable rock below the water table, which is the top of the zone of water-saturated rock. Some types of rock (loose sand and gravel) are naturally permeable, some (clay, shale and serpentine) are naturally impermeable, and some (lava, sandstone and other very hard rocks) may or may not be permeable, depending on what has happened to them. Ground water in Napa County is not evenly distributed because the geologic conditions are not ...
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