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Comprehensive Plan <br />SEPTIC SSYSTEMS <br />Sanitary Sewer Sub -Element <br />The third type of sanitary sewer system is an onsite sewage and treatment and disposal system <br />(OSTDS) which may be utilized under certain conditions when a private or publicly owned <br />centralized sewer system is unavailable„ the ^ my is the individual s •s*o,.„ gNX4�c o... <br />tank. -Septic systems are designed to serve one or a limited number of land <br />usesfacilities and are sized based on estimated water use. <br />Despite major expansion of the wastewater collection network, many r-os,��s—developed <br />commercial and residential parcels within the unincorporated portion of the county do not have <br />access to regional wastewater treatment facilities or package treatment plants. For those land <br />uses, wastewater treatment and disposal is provided by individUal—septic systems. Based on <br />n ^^ ding to di the Florida Department of Health Waste Water Inventory for 2015,E <br />County Health r epat4ment imnurr an estimated 45% of the developed commercial and <br />residential parcels in Indian River County are served by public sanitary sewer and an estimated <br />55% of the remaining developed commercial and residential parcels are served by septic <br />systems. From 2007 through 2016, there were an average of 6-58-121 new septic systems <br />constructed annually with steadily increasing numbers from 2013 to 2016. Even so, the average <br />number of new septic systems per year (121) is significantly lower than the 658 news stomper <br />year average for the 1995 — 2006 period. The average number of septic systems repairs per year <br />for the 2007-2016 period was 591. within the enineefper-ated eounty between 1995 to 2006 Of <br />these -septic tanks, 5°;te890; wer-e fer—eemmerc There are commercial and industrial <br />corridors that are served by septic systems such as portions of US Hwy 1, Old Dixie Hwy and <br />Oslo Road. Most of the residential septic systems are concentrated in Roseland, Sebastian, Vero <br />Lake Estates, and the ^'a platted subdivisions south of the City of Vefe B^^^'' State Road 60. <br />A septic system consists of two components. One is the septic tank, while the other is the <br />drainfield. The tank receives sewage from the residence or commercial establishment and <br />provides a period of settling, during which time a significant portion of the solids settle out. The <br />treatment process is accomplished by bacteria that gradually decompose the solids which settle <br />to the bottom of the septic tank. The remaining liquid or effluent is discharged through <br />underground drainage pipes into the drainfield where it percolates into the soil. Once in the <br />soil, microorganisms and filtration preeesses ,.,,,.:f -treat the liquids. Evefy tsee to fiN,e-mss; <br />As part of routine maintenance, the accumulated solids should Abe removed from the septic <br />tank every 3 to 5 years by a licensed contractor. These The solids, called septage, are generally <br />transported to regional it -1-it _f -OF tf atme * to disp^'.the residual <br />dewateringfacility acility next to the county landfill. <br />Septic tank -systems provide minimal on-site wastewater treatment for beth -residential and small- <br />Seale—commercial developments. Ceaer-a4Typically.,_a 3 -bedroom residential septic tis <br />system has a 900- gallon septic tank and 375 square <br />Community Development Department Indian River County 19 <br />Appendix A <br />317 <br />