Phosphorus loading to nearshore waters from legacy septic system groundwater plumes in a Great Lakes coastal community

High phosphorus (P) loads to the Laurentian Great Lakes contribute to eutrophication, harmful algal blooms, and hypoxia. Groundwater impacted by wastewater effluent from household septic systems, common in coastal communities, is a recognized P source to nearby lakes. However, the long-term impact of neighbourhood-scale septic system decommissioning (i.e., conversion to sewer connections) on this P loading is not well understood or quantified. The objective of this study was to investigate long-term P loading to Nottawasaga Bay from groundwater plumes of decommissioned septic systems in the coastal community of Wasaga Beach. Detailed groundwater sampling characterized a legacy P plume from a septic system decommissioned 35 years ago, revealing elevated soluble reactive phosphorus concentrations extending over 40 m and reaching the shoreline. Sorption and dispersion parameters required for neighbourhood-scale modeling were derived by simulating this persistent, long but thin P plume using a numerical model. Numerical simulations of P plumes from > 800 septic systems, 0.01–1.6 km from the shoreline and active 4000 years. Relatedly, the extended P transport meant the annual mass discharge rate to the lake was consistently © 2024