The industries employed an estimated 2,061 people. Most of the businesses in Dallas County purchase their water from a PWS or obtain their water from a private supply not requiring a permit. There are four water use permits for industry in Dallas County. There is no power production in Dallas County. Mining Water Use Mining in Dallas County consists of sand and gravel extraction.
Activity varies from year to year based upon construction needs.
Four water permits were issued for mining in the county. The Iowa State-Wide Rural Well Water Survey, 1990. The UHL's test results for the county also show that in an average year 22.2 percent of wells tested for nitrates exceeded the recommended maximum. These test results are based on non-random samples. The University of Iowa Hygienic Laboratory, Private Well Water Quality, 1990-1994.