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• Table 3. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 12 mg/L-N effluent <br /> The US EPA recommended Maximum Contaminant Level (MCL) for nitrate in drinking <br /> water is 10 mg/L-N. In a worst-case situation, the maximum buildup of nitrates in the <br /> aquifer from the use of an on-site septic system is predicted to be 12 mg/L-N. <br /> • <br /> • LOGE 1821 <br /> Page 8 <br />