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One question often raised when ozone professionals gather is “How much ozone capacity is installed?” Although the use of ozone for industrial purposes is growing, the largest use for ozone resides in the use of treatment of municipal drinking and wastewater. It is very difficult to summarize ozone capacity for industrial applications as much data are kept confidential. A number of reports have been published over the years on installed ozone capacity. Ozone capacity estimation is a moving target as plants are built and others removed from service for a number of reasons. This paper summarizes, using data available, ozone capacity for drinking water and wastewater. Focus is on the United States, Canada, Europe and Japan. IOA members and member companies are encouraged to submit additional data to enable this summary to be as accurate and relevant as possible. [ABSTRACT FROM AUTHOR]