COMAR regulations are the Code of Maryland Regulations: the complete, binding collection of administrative rules adopted by Maryland’s executive agencies to carry out the laws the General Assembly passes. The code currently contains 36 Titles, each assigned to a specific state department or board, and its rules cover everything from nursing license requirements to environmental discharge limits. Those rules carry the same legal force as the statutes they implement.
How COMAR Relates to Maryland Statutes
The General Assembly writes statutes that set broad policy goals. COMAR translates those goals into specific, enforceable requirements. A statute might direct the Department of the Environment to regulate air quality; the COMAR chapters under that department spell out the exact emission thresholds, testing methods, and reporting deadlines a business must meet. Without COMAR, most Maryland statutes would lack the technical detail anyone needs to comply.
Agencies cannot invent rules on their own. Every regulation has to trace back to a specific grant of authority from the legislature. If an agency reaches beyond what the General Assembly authorized, the regulation can be challenged and struck down. That delegation model keeps elected legislators in charge of policy direction while letting agencies with specialized staff handle the technical work.
How a COMAR Citation Is Built
COMAR uses a four-level numbering system. The broadest level is the Title, and each of the 36 Titles corresponds to a major department or functional area. Title 01 covers the Executive Department, Title 26 covers the Department of the Environment, and Title 31 covers Insurance. Each Title breaks into Subtitles that group related topics, Chapters that address specific programs, and individual Regulations that contain the actual requirements.
A citation reads as a four-part number separated by periods. COMAR 10.08.01.03 means Title 10, Subtitle 08, Chapter 01, Regulation 03. Once you know the format, you can jump straight to a specific rule instead of clicking down through menus. The Division of State Documents compiles and edits COMAR and keeps the numbering consistent across agencies.
How New Regulations Are Made
Maryland’s Administrative Procedure Act, in the State Government Article, Title 10, Subtitle 1, governs how agencies propose and adopt rules. The process is deliberately slow and public-facing, meant to keep agencies from quietly imposing rules that affect people’s livelihoods.
The Standard Rulemaking Process
An agency that wants to create or change a regulation first publishes the proposed text in the Maryland Register, which comes out every other week. Publication starts a 45-day review window, and at least 30 of those days are reserved for public comment. Anyone can submit written feedback during that window, and the agency must consider those comments before finalizing the rule. After the comment period closes and the agency makes any revisions, the final regulation is published in the Maryland Register and eventually folded into COMAR.
Emergency Rulemaking
When urgent circumstances require it, an agency can bypass the standard timeline and adopt a regulation immediately. Emergency adoption is not a unilateral power. The agency has to declare the emergency, submit the proposed regulation and a fiscal impact statement to the Joint Committee on Administrative, Executive, and Legislative Review (the AELR Committee), and get the Committee’s approval before the rule takes effect. Unless the Governor declares that immediate action is necessary to protect public health or safety, the AELR Committee cannot approve an emergency regulation sooner than 10 business days after receiving it.
Emergency regulations expire on a set schedule. The AELR Committee places a time limit of no more than 180 days on each emergency adoption. If the agency does not finalize the rule through the standard process before that deadline, the regulation reverts to whatever status it had before the emergency. That built-in expiration keeps the emergency label from becoming a permanent workaround.
How the Public Participates
Maryland law gives residents two ways to influence what agencies do beyond voting for legislators. The first is the comment period during standard rulemaking. When a proposed regulation appears in the Maryland Register, you have at least 30 days to submit written comments arguing for changes, strengthening, or withdrawal. Agencies are required to consider those comments, and substantive objections sometimes produce meaningful revisions in the final text.
The second route is more proactive. Under Section 10-123 of the State Government Article, you can petition an agency to adopt a new regulation, amend one, or repeal one, and the agency must respond. A petition does not guarantee the agency will act, but it creates a formal record and forces the agency to explain itself if it declines.
How to Look Up a Current Regulation
The Division of State Documents runs the primary online portal for COMAR, and the full text is available at no cost through the Library of Maryland Regulations website. You can browse by Title, clicking through department, subtitle, and chapter, or use the search bar. If you already have a four-part citation, entering it directly is faster than clicking through menus.
One detail matters more than it seems: the official, enforceable text of a regulation is the most recent version in COMAR itself, or, for very recently adopted rules not yet incorporated, the text published in the Maryland Register. If any other reproduction disagrees with the official text, only the official text controls.
Because there is always a lag between publication in the Register and incorporation into COMAR, you also need to check the Cumulative Table of COMAR Regulations Adopted, Amended, or Repealed. That table lists affected regulations in numerical order by citation, with the Maryland Register issue where each change appeared. If you are checking a rule for compliance or a legal matter, skipping the Cumulative Table means you could be relying on a rule that was amended or repealed weeks ago.
What Happens If You Violate a COMAR Rule
COMAR regulations carry the force of law, and the consequences for violating them vary by agency and by the nature of the violation. The tools agencies generally have include civil fines, license suspension or revocation, orders to stop an activity, and referral for criminal prosecution in serious cases.
The specific penalties live inside each agency’s own section of COMAR. Some licensing violations can result in fines of up to $10,000 per violation, with each day of continued noncompliance counted as a separate offense. Repeated violations within a set timeframe can trigger escalating penalties. Agencies can also order summary suspension of a license when they determine that a threat to public health or safety requires immediate action, before holding a full hearing.
Ignorance of a specific regulation is not a defense. If your business or profession falls under a Maryland agency’s jurisdiction, you are expected to know and follow the applicable COMAR provisions. Agencies do not always send individual notices when rules change, which is why watching the Maryland Register matters.
Challenging an Agency Decision
If you believe an agency has applied a COMAR regulation unfairly or made an incorrect decision in your case, Maryland gives you a structured path to challenge it. Most disputes start as contested case hearings inside the agency or before the Office of Administrative Hearings, depending on whether the agency has delegated its hearing authority.
After exhausting the administrative process, a party aggrieved by a final agency decision can seek judicial review by filing a petition in the circuit court for the county where any party resides or has a principal place of business. The court reviews the case without a jury and generally looks at whether the agency’s decision was supported by substantial evidence in the record, or whether it was arbitrary or unreasonable. Filing for judicial review does not automatically pause enforcement. You have to request a stay separately, and the court or the agency decides whether to grant one.
Judicial review is limited to the record built during the administrative proceedings. You generally cannot introduce new evidence in court unless you can show the evidence is material and you had good reason for not presenting it earlier. That makes the administrative hearing stage far more important than most people realize. The arguments and evidence you put on the record there are, for practical purposes, your only shot.