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.