"Estimated annual average phosphorus loading over 10 years to Lake Erie, 2015 to 2024",, ,, Watershed,Source,Annual 10-year average from 2015 to 2024 of phosphorus loading (tonnes per year) Huron-Erie corridor,Lake Huron,321 Huron-Erie corridor,Atmospheric,25 Huron-Erie corridor,Point source,572 Huron-Erie corridor,Non-point source,"1,098" Huron-Erie corridor,Total,"2,016" Western basin,Atmospheric,55 Western basin,Point source,273 Western basin,Non-point source,"2,974" Western basin,Total,"3,302" Central basin,Atmospheric,228 Central basin,Point source,331 Central basin,Non-point source,"1,823" Central basin,Total,"2,382" Eastern basin,Atmospheric,91 Eastern basin,Point source,107 Eastern basin,Non-point source,"1,196" Eastern basin,Total,"1,394" ,, "Note: Point source includes municipal sewage treatment plant effluent and industrial effluent. Non-point source includes agriculture and urban storm water runoff. Atmospheric deposition refers to phosphorus being deposited directly to the lake. The Huron-Erie corridor watershed includes input from Lake Huron, point and non-point sources and atmospheric deposition within the watershed. For more information, please see the Data sources and methods section (https://www.canada.ca/en/environment-climate-change/services/environmental-indicators/phosphorus-loading-lake-erie.html#DSM).",, Source: Environment and Climate Change Canada (2025) Freshwater Quality Monitoring and Surveillance Division.,, Available on the Environmental indicators website (www.canada.ca/environmental-indicators).,,