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Comprehensive Plan <br />Sanitary Sewer Sub -Element <br />• Regional systems are economically more efficient to build and operate, but only if all <br />new development connects to the system. <br />Septic Tanks <br />Between 1995 and 2006, 7,239 septic tanks (average of 658 per year) were permitted within the <br />county. <br />Generally, septic tanks are a potential source of groundwater contamination, especially in areas <br />where they are densely concentrated and the water table is high. According to the IRCHD, there <br />are many cases on record of a well's water source becoming polluted due to septic tank <br />discharges. As indicated in Table 3.A.5, septic tank effluent is of poor quality by today's <br />wastewater treatment standards. Consequently, effluent discharges can cause detrimental <br />increases in nitrogen, chloride, sodium, other ions, total dissolved solids, and the microbiological <br />levels of the local groundwater. <br />TABLE 3.A.5 <br />TYPICAL CONCENTRATIONS FOR HOUSEHOLD WASTEWATER, <br />SEPTIC TANK EFFLUENT AND WASTEWATER TREATMENT PLANT EFFLUENT <br />PARAMETER <br />CONCENTRATION <br />HOUSEHOLD WASTEWATER <br />SEPTIC TANK EFFLUENT <br />WASTEWATER TREATMENT <br />PLANT <br />Biochemical Oxygen <br />Demand, 5 -day (BODS), <br />mg/ 1 <br />430 <br />150 <br />20 <br />Total Suspended Solids, <br />mg/ 1 <br />370 <br />50 <br />20 <br />Fecal Coliform (per <br />100m1) <br />7.5 X105 <br />5X105 <br />200 <br />Total Nitrogen, mg/1 <br />84 <br />30 <br />30 <br />Ammonia Nitrogen, mg/1 <br />64 <br />25 <br />N/A <br />Total Phosphate, mg/1 <br />61 <br />12 <br />6 <br />Source: Indian River County Wastewater Master Plan <br />Community Development Department Indian River County 27 <br />