3406.1 All utility operators, and all District government agencies and instrumentalities, shall mark their underground facilities in response to a notification of excavation or demolition received pursuant to Section 5 of the Underground Facilities Protection Act of 1980, effective January 7, 1981 (D.C. Law 23-186; D.C. Official Code § 34-2704) (“Section 5 of the UFPA”), within the time frame and manner set forth in Section 5 of the UFPA.

3406.2 All utility operators, and all District government agencies and instrumentalities, shall use the following uniform color-coding system to mark their underground facilities:

(a) Underground facilities used for potable water shall be marked in blue.

(b) Sewers and drain lines shall be marked in green.

(c) Communications, alarms, or signal line cables and conduits shall be marked in orange.

(d) Temporary survey markings shall be marked in pink.

(e) Reclaimed water, irrigation, and slurry lines shall be marked in purple.

(f) Electric power lines, cables, and conduit/lighting cables shall be marked in red.

(g) The proposed excavation area shall be marked in white.

(h) Underground facilities used for gas, oil, steam, petroleum, or gaseous materials shall be marked in yellow.

3406.3 For the purposes of this section, the term “utility operator” shall have the meaning set forth in Section 2(8) of the Underground Facilities Protection Act of 1980, effective March 4, 1981 (D.C. Law 3-129; D.C. Official Code § 34-2701(8)).

SOURCE: Final Rulemaking published at 73 DCR 000504 (January 16, 2026).