The first municipal water softening plant in the United States was put into operation on December 28, 1903, at Oberlin, Ohio. A plant was in operation in Winnipeg, Canada, at that time, but it was given up because the supply was too small and because of the scale formation in the water works system.
Proceedings of the Iowa Academy of Science
©1928 Iowa Academy of Science, Inc.
"Water Softening for Municipalities,"
Proceedings of the Iowa Academy of Science, 35(1), 205-210.
Available at: https://scholarworks.uni.edu/pias/vol35/iss1/34