Abundant quantities of groundwater are available for domestic, irrigation, and industrial uses in Ballard County from depths of a few feet down to 600 feet. Generally, the depth to groundwater is less than 100 feet, except in the uplands of the southern part of the county. The chemical quality of the water is generally good, but water from some aquifers contains objectionable amounts of iron and manganese. Water from alluvium is generally hard to very hard. In some areas, percolation of contaminated surface water, fluids from domestic sewage-disposal systems, and other sources of domestic or industrial pollution have contaminated the aquifer. In some formations with slightly acidic groundwater, a chemical reaction between the acidic groundwater and steel well casing and pump equipment will produce a high iron content in the water.

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