D.C. Mun. Regs. tit. 21, § 5404
5404.1 An Owner shall, upon written request made by the General Manager, inspect all fixtures and appurtenant Interior Plumbing and inform the General Manager, in writing, of all cross connections on all properties that are the subject of General Manager's request.
SOURCE: Final Rulemaking published at 48 DCR 1743 (February 23, 2001).