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The effects of land use on nitrate concentrations in ground water were examined by dividing the study area into five subareas on the basis of percentage of land use-agriculture/forest [approximately (~) 50 percent agriculture and ~40 percent forest, hereafter referred to as “ag/forest”], agriculture [greater than (>) 75 percent of total land use], forest (>75 percent of total land use), urban (>65 percent of total land use), and mixed (fig. 1). Mixed areas were defined as small isolated areas with two or more land uses and were not included in analyses. Nitrogen inputs, which were calculated from fertilizer and manure applications, nitrogen fixation, and atmospheric deposition, were highest in the agriculture areas followed by ag/forest, urban, and forest areas. If all other factors remained the same, then nitrate concentrations in ground water should correspond to rates of input. However, the highest median concentration of nitrate-N (5.45 mg/L), was found in the ag/forest areas. This is an order of magnitude higher than the median concentrations in agriculture and forest areas (0.32 and 0.23 mg/L, respectively) and two orders of magnitude higher than that in Fact Sheet FS-070-94

Nitrate in ground water in the western Lake Michigan drainage basin, Wisconsin and Michigan