Northeast Ohio Regional Sewer District
Between 1988 and 1991, the District eliminated the use of elemental chlorine at its 3 waste water treatment plants. At Easterly, sodium hypochlorite replaced one-ton cylinders of elemental chlorine in 1989. At Southerly, sodium hypochlorite replaced 55-ton rail cars of elemental chlorine in 1990. At Westerly, sodium hypochlorite replaced 55-ton rail cars of elemental chlorine in 1992.

City of Cleveland
In 1999 the Cleveland Division of Water (CWD) began the transition from chlorine to sodium hypochlorite. The first step was to discontinue the use of chlorine rail cars at two water treatment plants - Nottingham and Baldwin. One plant (Crown) continued to use rail cars since recent improvements at the facility provided a rail car enclosure building and an associated scrubber system. The fourth plant (Morgan) does not have rail car access and consequently has not used rail cars for many years. In order to eliminate the usage of 90-ton rail cars at Nottingham and Baldwin, building modifications were necessary in order to meet the requirement for a 30-day supply. Rail car usage at these two facilities was discontinued in late 2000/early 2001.

After September 11, 2001, CWD discontinued the use of all chlorine rail cars due to the heightened risk of a terrorist using the chlorine as a weapon. Conversion from chlorine to sodium hypochlorite was complete at the Nottingham Water Treatment Plant in the June of 2002. The process was complete at the Baldwin Water Treatment Plant in June 2005. Both the Crown Water Treatment Plant and the Morgan Water Treatment Plant are scheduled to convert in 2010. By 2010, CWD will have completed its transition from chlorine to sodium hypochlorite as its disinfectant.

City of Solon
The Solon Waste Water Treatment Plant eliminated the use of chlorine and sulfur dioxide for waste water disinfection in 1997, substituting an ultraviolet light disinfection system.

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