Episode Details

New USGS modeling reveals that nutrient pollution in U.S. rivers actually rose between 2002 and 2022, driven by “legacy” nutrients from past farming and delayed pollution from air, cities, and septic systems—accounting for nearly half the nitrogen and over a third of phosphorus entering streams. Wetter weather amplified runoff, especially in the Midwest, where agricultural fertilizer use remained a major source despite declines in treated wastewater. Even as some areas saw lower nutrient concentrations, overall pollution loads surged, fueling algal blooms, harming aquatic life, and threatening drinking water. The study underscores that past actions continue to shape water quality today, urging smarter, long-term management strategies.

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