Licensed Plumbers in Maryland

The Maryland State Board of Plumbing licenses and regulates plumbers throughout most of Maryland, with exceptions for Baltimore County and Washington Suburban Sanitary Commission areas (Prince George's and Montgomery Counties), which maintain their own licensing systems.

Licensing and Regulations

Maryland requires apprentices to be at least 16 years old. Journeyman plumbers need four years holding an apprentice license plus 7,500 training hours under a master plumber, along with 32 hours of backflow prevention device testing training. Master plumbers must hold a journeyman license for at least two years and complete 3,750 additional training hours. State law mandates master plumbers carry minimum $400,000 insurance ($300,000 general liability and $100,000 property damage) through Maryland Insurance Administration-approved companies. PSI Testing Services administers examinations. Licenses renew every two years without current continuing education requirements. Maryland follows state-specific Title 12 regulations and COMAR Title 9.20 codes.

Maryland-Specific Plumbing Challenges

Maryland's Chesapeake Bay location creates unique challenges. Coastal and bay areas experience saltwater corrosion and high humidity. Many properties have aging septic systems that struggle in Maryland's water table conditions. Hard water affects much of the state. Baltimore's historic rowhouses often have century-old plumbing requiring specialized expertise. The state's geographic diversity spans from Appalachian mountains in western counties to coastal Eastern Shore, each with distinct needs. Freezing winters require proper insulation, while humid summers promote mold growth. The Washington suburbs have strict code requirements. Flooding risks exist along the bay and tributaries. Many rural areas rely on well water.

Find Trusted Contractors

Maryland's licensed plumbers understand the state's diverse geography and Bay conditions. These State Board of Plumbing certified professionals bring expertise in coastal challenges, aging infrastructure, and regional variations from Baltimore to Ocean City.

Major cities covered: Abingdon, Annapolis, Baltimore, Bel Air, Beltsville, Bethesda, Big Pool, Catonsville, and 38 more.