The Brief Nearly three in four urban stream tests exceeded a federal chloride toxicity threshold in February 2025. Road salt pollution is leaving some Loudoun County streams with chloride levels considered harmful to aquatic life, according to a new report from the Loudoun Wildlife Conservancy. What the report foundThe conservancy’s Salt Watch program collected 929 chloride tests at 71 sites across 21 streams between July 2024 and June 2025. How residents can reduce road salt pollutionThe report recommends shoveling before applying salt, using it sparingly and sweeping up excess after storms. Loudoun County residents can report excessive salt on county roads or uncovered piles in parking lots to stormwater@loudoun.gov.