As of 2022, there were * publicly owned treatment works (POTWs) operating in the U.S. From them around **** percent had a capacity of less than **** million gallons per day. Only ** treatment plants had a capacity of more than 100 million gallons per day during that period.
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Environmental Protection Agency. (April 29, 2024). Number of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by capacity [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 31, 2026, from /statistics/1489433/number-wastewater-treatment-plant-usa-by-capacity/
Environmental Protection Agency. "Number of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by capacity ." Chart. April 29, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 31, 2026. /statistics/1489433/number-wastewater-treatment-plant-usa-by-capacity/
Environmental Protection Agency. (2024). Number of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by capacity . ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 31, 2026. /statistics/1489433/number-wastewater-treatment-plant-usa-by-capacity/
Environmental Protection Agency. "Number of Publicly Owned Wastewater Treatment Works (Potws) in The United States as of 2022, by Capacity ." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 29 Apr 2024, /statistics/1489433/number-wastewater-treatment-plant-usa-by-capacity/
Environmental Protection Agency, Number of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by capacity ÌÇÐÄÆƽâ°æ, /statistics/1489433/number-wastewater-treatment-plant-usa-by-capacity/ (last visited July 31, 2026)
Number of publicly owned wastewater treatment works (POTWs) in the United States as of 2022, by capacity [Graph], Environmental Protection Agency, April 29, 2024. [Online]. Available: /statistics/1489433/number-wastewater-treatment-plant-usa-by-capacity/
