The industries employed an estimated 619 people. Most of the businesses in Grundy County purchase their water from a PWS or obtain their water from a private supply not requiring a permit. There are two water use permits for industry in Grundy County. There is no power production in Grundy County. Mining Water Use Mining in Grundy County consists of sand and gravel extraction.
Activity varies from year to year based upon construction needs.
Two water permits were issued for mining in the county. The State-Wide Rural Well Water Survey completed in 1989 indicates the following quality results for private well water, shown in Table 3, for the east hydrogeologic region in which Grundy County is located. The Iowa State-Wide Rural Well Water Survey, 1990. The UHL's test results for the county show that in an average year no wells tested for nitrates exceeded the recommended maximum. These test results are based on non-random samples.