Modeled Phosphorus Loads to the Chesapeake Bay (1985-2023) ^‍‍

Loads simulated using CAST-19 and jurisdiction-reported data on wastewater discharges, in millions of pounds. *The natural sector includes, in part, forests and wetlands which are preferable land use types with the lowest loading rates among sources. See how these data are used in the 2025 Watershed Implementation Plans (WIPs) Outcome.