Maryland Plumbing Code and Regulations
This domain tests Maryland-specific administration: which code applies, who may perform and permit work, how inspections are handled, and where state and local rules interact. The Maryland Plumbing Code is adopted under COMAR and is based on the International Plumbing Code with Maryland amendments; local jurisdictions may add stricter requirements, so the enforced edition and local amendments matter.
Maryland rules and roles
- A master plumber is licensed to contract for plumbing work and is generally the party who obtains plumbing permits. A journeyman plumber performs work under a master’s authority; apprentices must be registered and supervised according to state requirements.
- A permit is required before most new plumbing work, alterations, and replacements. Work must be inspected at required stages, including rough-in before concealment and final inspection after completion.
- Unpermitted or unlicensed work can lead to stop-work orders, citations, failed inspections, and removal or correction of concealed work.
- The adopted code governs materials, fixtures, water supply, drainage, venting, and backflow protection; manufacturer instructions and approved listings still apply.
- Local governments may enforce additional permit, inspection, or licensing requirements, so always check the jurisdiction where the project is located.
Worked example
A journeyman replaces a residential water heater while working for a licensed plumbing contractor. The journeyman may perform the installation, but the permit must be obtained through the licensed master/contractor before the work begins, and the required inspection must be requested. If the journeyman pulls the permit independently or skips the permit because the replacement seems minor, the administrative chain is broken and the work is exposed to enforcement. The reasoning is that licensing authorizes the scope of work, while permits and inspections are separate legal requirements tied to the licensed contractor and the property.
Traps that cost marks
Assuming a state license eliminates local permit requirements, performing plumbing work as an unlicensed handyman, concealing work before rough-in inspection, and failing to confirm the locally enforced code edition are frequent errors.
Key ideas: verify the enforced code, permit before work, inspect before concealment, and keep work within the license holder’s authority.