Water-quality professionals are confirming what fishermen and boaters on U.S. waterways already know: Nutrient pollution is increasingly damaging the water environment.In its National Water Program Guidance report in 2014, the U.S. EPA called nutrient pollution one of the country’s most serious and pervasive water-quality problems in the U.S. But while the threat is confirmed, questions remain about the cost of nutrient control and the impact of point versus nonpoint sources.While many municipal treatment plants have invested heavily to limit phosphorus in their discharges, new total maximum daily loadings (TMDLs) may call for even more expenditures.It’s a huge bill. For example,
