We began feeding fluoride into drinking water in 1956, but an Ohio law governing fluoridation (the process of adding fluoride to our drinking water) in public water supplies was enacted in the early 1970s to meet public health needs.
Today, we feed about 0.7 to 0.9 mg/L of fluoride into our drinking water as a liquid (hydrofluorosilicic acid) so we can carefully control the amount with our chemical feed pumps. When added to the amount of fluoride (0.1 to 0.3 mg/L) naturally found in Lake Erie, our total concentration of fluoride in the water leaving our treatment plants is approximately 1.0 mg/L which falls right in the middle range currently designated by Ohio Revised Code 6109.20.
Fluoride is a “conservative chemical.” In other words, it does not react with other chemicals typically found in drinking water. Therefore, the amount of fluoride in the water that leaves the plant is typically what you will see at your kitchen or bathroom sink.
With regard to the use of fluoride in drinking water, Cleveland Water adheres to Ohio Revised Code and requirements of the Ohio EPA which has regulatory oversight of the fluoride law.