For many clean-water utilities, the possibility of stricter nutrient removal requirements looms on the horizon. New total maximum daily loadings for water bodies and increasing concern over algae buildups are driving new measures to curtail phosphorus and nitrogen.But point-source discharges are only part of the issue. Much of the nutrient loading to streams and lakes comes from nonpoint sources, especially agricultural runoff. What’s the best strategy for dealing with the overall problem?One organization taking a proactive approach is the National Wildlife Federation. In 2013, the federation began a concerted effort to encourage sustainable agriculture in the Upper Mississippi River Basin,
