D.C. Mun. Regs. tit. 21, § 507
507.1 The Mayor may post notice on the shores of a District waterbody of a related hazard to public health or safety.
507.2 Upon determination that a direct or indirect contact with a waterbody of the District, including immersion, fishing, or boating, poses a hazard to the public health or safety, the Department may take action deemed necessary to protect the public health until the hazard has ended, including a prohibition of all recreational activities on the affected waters of the District.
507.3 If the Department takes action to protect the public health from a hazard, the Department shall:
(a) Notify the Council of the District of Columbia immediately of the action; and
(b) Notify the public through media most likely to effectively advise of the hazard, including:
(1) Newspapers of general circulation in the District;
(2) Radio stations serving the District; and
(3) Electronic media.
507.4 An action taken by the Department to protect public health from a hazard shall remain in effect until rescinded, or for a period of two (2) weeks, whichever is shorter.
507.5 The Department may extend the life of an action taken to protect public health from a hazard beyond a two (2) week period, only if the Council of the District of Columbia, by resolution, so approves.
507.6 From District waters designated as a public health hazard, no person shall operate any pumping device or water vessel so as to generate a spray which falls upon the adjacent shore, except as authorized by the Mayor for good cause shown.
SOURCE: 8 DCRR § 8-2:804, Health Regulations (1965 Edition); as amended by Section 2 of the Soil Erosion and Sedimentation Control Act of 1977 (D.C. Law 2-23; 24 DCR 792 (July 22, 1977)); as amended by Final Rulemaking published at 60 DCR 10640 (July 19, 2013).