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Comprehensive Plan <br />Sanitary Sewer Sub -Element <br />Generally, septic systems are a potential source of groundwater and surface water contamination, <br />especially in areas where they are densely concentrated, and the water table is high and <br />waterbody setbacks are less than 75 feet. According to theDOH-Indian River, there have been <br />cases of wells and surface waters being contaminated from septic system discharges. As <br />indicated in Table 3.A.5, septic system effluent is of poor quality by today's wastewater <br />treatment standards. Consequently, effluent discharges can cause detrimental increases in <br />nitrogen, chloride, sodium, other ions, total dissolved solids, and the microbiological levels of <br />the local groundwater. <br />TABLE 3.A.5 - TYPICAL CONCENTRATIONS FOR HOUSEHOLD WASTEWATER, <br />SEPTIC TANK EFFLUENT AND WASTEWATER TREATMENT PLANT EFFLUENT <br />PARAMETER <br />CONCENTRATION <br />SEPTIC TANK <br />WASTEWATER <br />HOUSEHOLD <br />EFFLUENT <br />TREATMENT PLANT <br />WASTEWATER <br />(Max Day) <br />Biochemical Oxygen <br />430 <br />150 <br />20 <br />Demand, 5 -day (BODS), <br />mg/1 <br />Total Suspended Solids, <br />370 <br />50 <br />20 <br />mg/1 <br />Fecal Coliform (per <br />7.5 X105 <br />5X105 <br />200 <br />loom]) <br />Total Nitrogen, mg/l <br />84 <br />30 <br />12 <br />Ammonia Nitrogen, mg/1 <br />64 <br />25 <br />N/A <br />Total Phosphorus, mg/l <br />61 <br />12 <br />1 1.5 <br />Source: Indian River County Wastewater Master Plan <br />Generally, the current system of septic system maintenance is acceptable, particularly for newer <br />septic tanks meeting current regulations. For older septic systems, however, lack of maintenance <br />can be a problem, and there is no program requiring regular maintenance of these septic systems. <br />Community Development Department <br />Indian River County 29 <br />Attac4Went 4 <br />