As of 2022, there were * publicly owned treatment works (POTWs) operating in the U.S. During that period, only **** percent of them had advanced treatment processes in their plants. Advanced treatment aims to reduce or eliminate impurities below what is attainable through more conventional secondary treatment, for example, ozone treatment, membrane bioreactors, and ultraviolet processes.
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Environmental Protection Agency. (April 30, 2024). Distribution of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by treatment level [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 26, 2026, from /statistics/1473528/distribution-wastewater-treatment-plants-usa-by-type/
Environmental Protection Agency. "Distribution of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by treatment level." Chart. April 30, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 26, 2026. /statistics/1473528/distribution-wastewater-treatment-plants-usa-by-type/
Environmental Protection Agency. (2024). Distribution of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by treatment level. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 26, 2026. /statistics/1473528/distribution-wastewater-treatment-plants-usa-by-type/
Environmental Protection Agency. "Distribution of Publicly Owned Wastewater Treatment Works (Potws) in The United States as of 2022, by Treatment Level." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 30 Apr 2024, /statistics/1473528/distribution-wastewater-treatment-plants-usa-by-type/
Environmental Protection Agency, Distribution of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by treatment level ÌÇÐÄÆƽâ°æ, /statistics/1473528/distribution-wastewater-treatment-plants-usa-by-type/ (last visited July 26, 2026)
Distribution of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by treatment level [Graph], Environmental Protection Agency, April 30, 2024. [Online]. Available: /statistics/1473528/distribution-wastewater-treatment-plants-usa-by-type/
