14 CAR § 21-803. Disinfection

(a) Surface discharging systems shall be adequately disinfected prior to discharge. (b)(1) Chlorination, ozone induction, and ultraviolet exposure are all acceptable means of disinfection for surface discharges. (2) Installation, operation, and performance data supplied by the manufacturer shall be submitted with all designs incorporating ozone or ultraviolet light devices. (3) A sample port shall be installed within five feet (5’) of the disinfection outlet or chlorine contact chamber with a minimum six inches (6”) of fall for sample collection. (c) Chlorinators used in surface discharging systems shall produce a minimum ten parts per million (10 ppm) chlorine solution during peak flow. (d)(1) A baffled contact chamber sufficient in size to provide a thirty-minute retention time with a minimum flow of one (1) gallon per minute shall be required after the chlorinator for all surface discharging systems utilizing chlorine disinfection. (2) The minimum size of a chlorine contact chamber shall be thirty (30) gallons. (e)(1) The point of discharge from the chamber shall be above the high-water level of a receiving stream or ditch. (2) The chamber discharge elevation shall also be below its influent elevation to prevent flooding of the treatment unit. (f)(1) When a surface discharging system fails to function properly or does not consistently meet the discharge requirements, the discharge of wastewater shall stop immediately. (2) The owner shall be allowed to use the septic tank or mechanical treatment unit as a holding facility until adequate repairs are made.