D.C. Mun. Regs. tit. 21, § 504
504.1 Upon notice from the Department that it has determined that one (1) or more of the following conditions exists, a person shall stop identified work immediately until the situation is corrected:
(a) Noncompliance with a notice that requires corrective action;
(b) Material false statement or misrepresentation of fact in an application that the Department approved for the project;
(c) During the project, the license of a contractor or subcontractor is void, has expired, or has been suspended or revoked;
(d) Work involving an activity regulated under this chapter is being conducted:
(1) In violation of a provision of this chapter;
(2) In an unsafe manner; or
(3) In a manner that poses a threat to the public health or the environment.
504.2 A stop work order shall:
(a) Have immediate effect;
(a) Be issued in writing; and
(c) Be provided to:
(1) The person who has received an approval under this chapter;
(2) The person doing the work; or
(3) The person on site who is responsible for the work.
504.3 The stop work order shall identify the:
(a) Address and location of the work;
(b) Corrective action or cessation required;
(c) Time period required to complete corrective action;
(d) Reason for the order;
(e) Person issuing the order, including telephone contact, and, if available, email or other electronic means of address; and
(f) Steps to be taken to challenge or appeal the order.
504.4 The Department shall:
(a) Post the stop work order at the property; and
(b) Send the stop work order in a manner likely to ensure receipt, including first-class mail, fax with return receipt, email with return read receipt, or hand-delivery with certification of service.
504.5 No person shall remove a stop work order posted at a site without the Department's written approval.
504.6 A person who continues work stopped by an order shall be in violation of this chapter for each day on which work is conducted, except for work:
(a) Required immediately to stabilize the activity and place the property in a safe and secure condition;
(b) That the Department orders; or
(c) Required immediately to eliminate an unsafe condition or threat to the public health or the environment.
SOURCE: 8 DCRR § 8-2:805, 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); as amended by Final Rulemaking published at 72 DCR 012101 (October 31, 2025).