Nitrous oxides (N₂O) emissions from wastewater treatment in the United States totaled nearly 22 million metric tons of carbon dioxide equivalent (MtCO₂e) in 2022. Domestic treatment was the largest source of emissions, with 7 MtCO₂e, while domestic discharge released 4.4 MtCO₂e. Since 1990, N₂O emissions from wastewater treatment in the U.S. have increased.
Nitrous oxide (N₂O) emissions from domestic and industrial wastewater treatment in the United States from 1990 to 2022
(in million metric tons of CO₂ equivalent)
* Industrial activity for N₂O includes the pulp and paper manufacturing, meat and poultry processing, starch-based ethanol production, and petroleum refining.
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Environmental Protection Agency. (April 11, 2024). Nitrous oxide (N₂O) emissions from domestic and industrial wastewater treatment in the United States from 1990 to 2022 (in million metric tons of CO₂ equivalent) [Graph]. In Statista. Retrieved January 20, 2025, from https://www.statista.com/statistics/883338/wastewater-treatment-nitrous-oxide-emissions-us/?__sso_cookie_checker=failed
Environmental Protection Agency. "Nitrous oxide (N₂O) emissions from domestic and industrial wastewater treatment in the United States from 1990 to 2022 (in million metric tons of CO₂ equivalent)." Chart. April 11, 2024. Statista. Accessed January 20, 2025. https://www.statista.com/statistics/883338/wastewater-treatment-nitrous-oxide-emissions-us/?__sso_cookie_checker=failed
Environmental Protection Agency. (2024). Nitrous oxide (N₂O) emissions from domestic and industrial wastewater treatment in the United States from 1990 to 2022 (in million metric tons of CO₂ equivalent). Statista. Statista Inc.. Accessed: January 20, 2025. https://www.statista.com/statistics/883338/wastewater-treatment-nitrous-oxide-emissions-us/?__sso_cookie_checker=failed
Environmental Protection Agency. "Nitrous Oxide (N₂o) Emissions from Domestic and Industrial Wastewater Treatment in The United States from 1990 to 2022 (in Million Metric Tons of Co₂ Equivalent)." Statista, Statista Inc., 11 Apr 2024, https://www.statista.com/statistics/883338/wastewater-treatment-nitrous-oxide-emissions-us/?__sso_cookie_checker=failed
Environmental Protection Agency, Nitrous oxide (N₂O) emissions from domestic and industrial wastewater treatment in the United States from 1990 to 2022 (in million metric tons of CO₂ equivalent) Statista, https://www.statista.com/statistics/883338/wastewater-treatment-nitrous-oxide-emissions-us/?__sso_cookie_checker=failed (last visited January 20, 2025)
Nitrous oxide (N₂O) emissions from domestic and industrial wastewater treatment in the United States from 1990 to 2022 (in million metric tons of CO₂ equivalent) [Graph], Environmental Protection Agency, April 11, 2024. [Online]. Available: https://www.statista.com/statistics/883338/wastewater-treatment-nitrous-oxide-emissions-us/?__sso_cookie_checker=failed
