According to a map of the United States on which the hardness of water is shown, Iowa is one of nine states which are classed as having the hardest water. The states besides Iowa are Florida, Indiana, Illinois, South Dakota, Nebraska, Kansas, Oklahoma, and Arizona. These states for the most part are the best agricultural states. The hard water, however, makes them less desirable as places of residence.
Proceedings of the Iowa Academy of Science
©1931 Iowa Academy of Science, Inc.
"Water Softening by Base Exchange,"
Proceedings of the Iowa Academy of Science, 38(1), 151-155.
Available at: https://scholarworks.uni.edu/pias/vol38/iss1/16