- (1) For residences, the liquid capacity of the septic tank shall be based on the following: Number of Septic Tank Bedrooms Capacity 2 or less 750 gallons 3 900 gallons 4a 1000 gallons a For each additional bedroom, add two hundred fifty (250) gallons
- (2) For facilities other than residences, the net volume or effective liquid capacity below the flowline of a septic tank for flows up to five hundred (500) gallons per day shall be at least seven hundred fifty (750) gallons. For flows between five hundred (500) and fifteen hundred
- (1500) gallons per day, the capacity of the tank shall be equal to at least one and one-half (1 1/2) days’ liquid sewage flow. With flows greater than fifteen hundred (1500) gallons per day the minimum effective tank liquid capacity shall equal one thousand one hundred twenty-five
- (1125) gallons plus seventy-five (75) percent of the daily sewage flow; or V=1125+0.75Q where V is the volume of the tank in gallons and Q is the daily sewage flow in gallons. Additional tank volume may be necessary where unusual waste water characteristics are expected from a facility. Expected normal sewage flows may be determined from a list as provided by the Department or actual known water usage data for any facility to be served may be used if available.
Authority: T.C.A. §§ 68-221-401 et seq. and 4-5-201 et seq. Administrative History: Original rule filed June 20, 2013; effective September 18, 2013. Rule renumbered from 1200-01-06.