Md. Code Regs. 26.11.20.01 – Visible Emissions from Ships.

A person or agent may not cause or permit the discharge of emissions from any ship in excess of the following limits:

Operating Mode	Chart Number	Allowable Time
A. Underway, at berth, or at anchor	20%—1	No limit.
B. Soot blowing: (1) Underway within 1 mile (1.6 kilometer) of any shore	—	No soot blowing allowed.
(2) At berth or anchor: (a) Within first or last 24 hours of arrival or departure	—	No soot blowing allowed.
(b) Any other 24-hour period	No limit.	15 minutes for each boiler in operation provided that no nuisance is created.
C. Cleaning and adjusting of combustion equipment while at berth or anchor	40%—2	Not to aggregate more than 4 minutes in any 60-minute period.
D. Start-up of cold boiler or engine	No limit	5 consecutive minutes.
	60%—3	10 consecutive minutes additional.
E. Anchoring, berthing, or other maneuvering requiring rapid changes in power	80%—4	No limit.
F. Upset/breakdown/emergency casualty or Coast Guard safety tests	No limit	No limit. The control officer shall be notified as to the reason for the excessive emissions.
G. Docktrials of new or rebuilt boilers or engines	No limit	No limit provided a nuisance is not created and the control officer has been notified before 3 p.m. the day before the docktrials are to be conducted.

Authority: Environment Article, §§2-102, 2-103, and 2-301, Annotated Code of Maryland

Effective date: July 18, 1980 (7:12 Md. R. 1148)

For the history of this subtitle before June 18, 1980, see the Administrative History of COMAR 26.11.01.

Regulation .01 recodified as Regulation .06 and new Regulations .01 and .03—.05 adopted effective November 19, 1983 (10:20 Md. R. 1786)

Regulations .01, .03, and .04 amended as an emergency provision effective January 25, 1989 (16:3 Md. R. 338); emergency status expired June 26, 1989

Regulations .01 and .03—.05 repealed and Regulations .02 and .06 recodified as Regulations .01 and .02 effective June 26, 1989 (16:10 Md. R. 1110)

Regulation .02 repealed and new Regulation .02 adopted effective February 7, 2022 (49:3 Md. R. 139)

Regulation .02A, C amended effective January 9, 2023 (49:27 Md. R. 1111)

Regulation .02F repealed effective March 30, 2026 (53:6 Md. R. 293)

Regulation .03 adopted effective October 26, 1992 (19:22 Md. R. 1991 and 19:21 Md. R. 1894)

Regulation .04 adopted effective March 22, 1999 (26:6 Md. R. 488)

Regulation .05 adopted effective July 10, 2000 (27:13 Md. R. 1212)

Regulation .06 adopted effective December 10, 2001 (28:24 Md. R. 2132)

Regulation .06D amended effective May 9, 2005 (32:9 Md. R. 850)