Public Health engineers tell us that on many Iowa farms the water supply isn't safe to use. This doesn't mean that persons drinking such water will automatically come down with typhoid fever or other diseases. But drinking impure water doesn't improve anybody's health. A good deal of "summer complaint'" is probably due to poor water supply.
"How Good Is Your Water Supply?,"
Iowa Farm Science: Vol. 3
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol3/iss9/4