National Water-Quality Assessment (NAWQA) Program
U.S. GEOLOGICAL SURVEY
Water-Resources Investigations Report 98-4222
Sacramento, California, 1999
Figure 32. Comparison of estimated loads of total herbicides and insecticides for 25 sites with sufficient data for load estimates for 2 different years. Data from 14 agricultural, 7 urban, and 4 integrator sites are included. For 23 sites, loads for 1993 are compared with loads for 1994. For two sites, loads for 1992 are compared with loads for 1993. For nine sites, loads are compared for 1 full year. For 16 sites, loads for a 5 to 6 month period are compared. The diagonal line shows what would be1:1 agreement between the loads for both years for a site.