After 10 years of data collection, this phase of the program has been completed. Ninety wells completed in the principal aquifers of the State have been selected for sampling to determine possible trends in ground-water quality. Bedrock wells not vulnerable to contamination are sampled every four years. All wells are sampled for major ions, nutrients, and common herbicides. Network data are compiled and published in the annual U.S. Geological Survey Water Resources Data, Iowa report .
Copies are available for distribution.
The report reviews the water-quality data since the program's inception in 1982 and provides basic statistics by county, aquifer, and well depth. A CD-ROM of the entire data set accompanies the report. The results will be published in the next Annual Report. Back to the Active USGS Projects in Iowa homepage. Return to the Water Resources of Iowa homepage.