... Nonpoint-Source Pollution in the U.S.Figure 16.15B1 6-1 9Source: Modified from U.S. Water Resources Council, The Nation’s Water Resources 197 5-2 000, vol. 1, pp. 6 1-6 3. Algae-Covered Lake ... in the environment.) Groundwater Pollution ProblemsFigure 16.171 6-2 0Source: Modified from U.S. Water Resources Council, The Nation’s Water Resources 197 5-2 000, vol. 1, p. 65. New Technology ... very simple case.) Agricultural Pollution Agricultural Pollution ãFertilizersãSediment Pollution ãHerbicides and Pesticides Water Pollution Figure CO161 6-1 Source:Courtesy of Carla W....