What This License Is and Why It Matters

A journeyman plumber license is a state-issued credential that authorizes an individual to perform plumbing work independently under the supervision of a licensed master plumber. This license occupies the middle tier in most states' plumbing credential hierarchy — above apprentice registration and below the master plumber classification. It is required to legally perform plumbing services in most states.

Prerequisites and Eligibility Requirements

Requirements vary significantly by state, but common prerequisites include:

  • Age: Minimum 18 years old (most states)
  • Work experience: Typically 4,000–8,000 hours of documented plumbing work. Wisconsin requires 4 years minimum; Texas requires 8,000 hours; Michigan requires 4,000 hours over at least 2 years; Tennessee requires 8,000 hours or 4 years.
  • Apprenticeship or equivalent training: Completion of an approved apprenticeship program (typically 4 years with 640+ hours of classroom instruction) or equivalent on-the-job experience under a licensed journeyman or master plumber
  • Citizenship: U.S. citizen, national, or eligible alien (Texas requirement)
  • Criminal background: Some states require fingerprinting and background checks; felony convictions may require supplemental disclosure

Step-by-Step Process to Obtain the License

  1. Complete apprenticeship or document work experience: Enroll in a state-approved apprenticeship program registered with your state's Department of Workforce Development, or accumulate required hours working under a licensed plumber. Keep detailed employment records.
  2. Complete required classroom instruction: Apprenticeship programs typically require 576–900 hours of classroom-based instruction covering plumbing code, trade mathematics, pipe sizing, fixture calculations, and safety.
  3. Apply for exam eligibility: Submit documentation of work hours, apprenticeship completion, and any required training courses to your state's licensing board or DOPL (Division of Occupational and Professional Licenses).
  4. Pass the journeyman plumber exam: Exams are administered by state-approved testing vendors (such as IAPMO or PSI) and cover state plumbing code, mathematics, safety, and trade practices. You typically have one year from approval to take the exam.
  5. Apply for license: Submit your license application with proof of exam passage, work hours, training completion, and applicable fees to your state licensing board.
  6. Receive license: Upon approval, you receive your journeyman plumber license.

Costs

Total costs vary by state and training pathway:

  • Exam fees: $40–$100+ (Texas exam application is $40; other states vary)
  • License fees: $50–$300+ (Wisconsin shows $210 total fees as of 2026)
  • Apprenticeship training: $0–$5,000+ depending on program (many union and community college programs are low-cost or free)
  • Required training courses: Texas requires a 48-hour approved training course (cost varies by provider); reciprocal licenses from other states may waive this
  • Application and processing: $40–$100 per application

State-by-State Differences

Wisconsin: Requires 4 years of documented apprenticeship or work experience. Journeyman plumbers must work under general supervision of a licensed master plumber, master plumber restricted, or utility contractor. Separate certification is required for backflow prevention and cross-connection control work.

Texas: Requires 8,000 hours of experience and a 48-hour approved training course (waived if you hold a journeyman or master license from another state). Application fee is $40.

Michigan: Requires 4,000 hours of journeyman-level work over at least 2 years immediately preceding application. Any lapses in licensure disqualify applicants.

Idaho: Requires 8,000 hours of documented on-the-job work under a licensed journeyman. Exam is administered by IAPMO through PSI.

California: Requires 4 years of journeyman-level experience (6,800 hours). As of June 30, 2025, plumbing contractors must display registration and master plumber license numbers on vehicles and business materials.

Louisiana: Requires 5 years as a licensed journeyman before applying for master plumber status.

Maine: Requires 1 year as a licensed journeyman before applying for master plumber status.

Renewal and Continuing Education

Renewal requirements vary by state. Most states require biennial (two-year) license renewal with associated fees ($50–$200+). Specific continuing education requirements are established under state administrative codes; Wisconsin requires compliance with Wisconsin Administrative Code SPS 305. Check your state licensing board for specific renewal deadlines and CE hour requirements.

Where to Apply or Register

Applications are submitted directly to your state's licensing authority:

  • Wisconsin: Wisconsin Department of Safety and Professional Services (DSPS) — dsps.wi.gov
  • Texas: Texas State Board of Plumbing Examiners (TSBPE) — tsbpe.texas.gov
  • Michigan: Michigan Department of Licensing and Regulatory Affairs (LARA) — michigan.gov/lara
  • Idaho: Division of Occupational and Professional Licenses (DOPL) — dopl.idaho.gov
  • Other states: Contact your state's Department of Labor, Licensing, or Construction Industry Board

Typical Timeline

From start to completion: 4–6 years for apprenticeship pathway (4 years apprenticeship + 6–12 months for exam and licensing). Work experience pathway: varies based on hours accumulated. Licensing processing typically takes 6–8 weeks once the application is approved.