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Table 4. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 14.6 mg/L-N effluent <br /> The US EPA recommended MCL for nitrate in drinking water is 10 mg/L-N. In a worst- <br /> case situation, the maximum buildup of nitrates in the aquifer from the use of an on-site <br /> septic system is predicted to be 14.6 mg/L-N. <br /> • <br /> • LOGE 1833 Page 8 <br />