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• Sources of Nitrate to Groundwater <br /> Off-Site Sources of Nitrate <br /> Many sources can contribute to ground water nitrate contamination, including <br /> agricultural activities, dairies and cattle ranches, septic systems, and storm water <br /> infiltration. <br /> Septic systems and dairies have been found to be the most significant sources of nitrate <br /> in ground water. Orchards that require fertilization in sandy soils are also a significant <br /> source of nitrate contamination in shallow or sandy aquifers in San Joaquin County. <br /> The general area consists of orchards, rural residences, and open agricultural land. <br /> • <br /> • LOGE 1807 Page 5 <br />