fertilizer runoff

U.S. Geological Survey researchers developed models to better understand the timing and sources contributing to nutrient pollution in streams and rivers. They say their findings can help guide efforts to improve water quality.

Quick-growing blooms of bacteria and algae have long been a hazard in lakes and rivers, because of the toxins they produce. Fueled in part by agricultural runoff, these blooms are also threatening public water systems, making water temporarily unusable, and forcing some cities and towns to take costly preventive measures.