Prediction of Pesticide Occurrence

Relatively few predictions of pesticide contamination of ground water have been tested against data on pesticide occurrence in ground water. In most cases where such comparisons have been carried out, computer simulations and ground-water vulnerability assessments have shown only limited ability to predict pesticide occurrence in ground water. In addition, other solutes, most commonly nitrate and tritium, have been examined as potential indicators of pesticide occurrence in ground water, but none have proven to be reliable for this purpose.