Nitrate accumulation in ground water is a major global problem, especially in farming communities where fertilizers are used. A nitrate reducing microbial fuel cell fed by hydrogen from a PEM-based water electrolysis cell has been proposed as a low cost alternative to current water treatment methods. To this end, Geobacter sulfurreducens anodes are electrochemically evaluated for their ability to reduce nitrate. G. sulfurreducens was subcultured in a nitrate-based media, then cast on 1 cm² Toray paper electrodes and immobilized with 4% pectin cross-linked with magnesium chloride. Cyclic voltammograms in Figure 1 demonstrate bioelectrocatalytic nitrate reduction by the G. sulfurreducens anode. Preliminary data gathered from the microbial fuel cell system built by Proton OnSite shows a decrease in nitrate correlating with an increase in ammonia and nitrite with operation.