D.C. Mun. Regs. tit. 25-B, § 1413
1413.1 A device such as a water treatment device or backflow preventer shall be scheduled for inspection and service, in accordance with the manufacturer's instructions and as necessary to prevent device failure based on local water conditions. Records demonstrating inspection and service shall be maintained by supervisors.
SOURCE: Final Rulemaking published at 56 DCR 5245 (July 3, 2009).