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All articles about Washington Plumber License Guide: Apprentice to Journeyman to Master.
Best Plumber Licensing Resource for Independent Trainees in Washington
The best licensing resource for Washington plumber trainees who aren't in a union apprenticeship — what to look for, what to avoid, and how to protect your hours.
ESSB 6197 Washington Plumbing — New Infraction Rules Starting January 2027
ESSB 6197 changes Washington's plumbing suspension threshold to five infractions in five years and removes the advisory board's role. Here's what contractors need to know.
How Much Do Plumbers Make in Washington State
Washington plumber salaries by license level, from trainee wages to master plumber and contractor earnings. Real numbers from BLS and L&I data.
How to Avoid Losing Plumbing Experience Hours in Washington
Washington plumber trainees can permanently lose documented hours from a single paperwork mistake. Here's how to protect every hour you've earned.
How to Document Plumbing Hours in Washington — Affidavits, Deadlines, and Hour Erasure
Washington's 30-day affidavit deadline can permanently erase your plumbing hours. Here's how to document, file, and protect every hour you work.
How to Start a Plumbing Business in Washington Without a Licensing Consultant
Step-by-step guide to registering a plumbing contractor business in Washington State without paying a consultant — every agency, bond, and filing in sequence.
King County Plumbing Permit — Who Can Pull One and What It Costs
Learn who can pull a plumbing permit in King County and Seattle, what the 2026 permit changes mean, and how to avoid common rejection mistakes.
King County Water Heater Permit — What Changed in 2026
King County now requires permits for like-for-like water heater replacements. Learn what the new rules cover, who can pull the permit, and what the inspection process looks like.
Plumber License Guide vs Hiring a Licensing Consultant in Washington
Comparing a self-service plumber license guide against hiring a licensing consultant in Washington — cost, coverage, and when each option makes sense.
PSI Plumbing Exam Washington — Scheduling, Format, and What to Expect
Washington's plumbing competency exam is administered by PSI Services. Learn the three-part format, scheduling process, fees, and retake rules for the PL01 and PL02 exams.
Washington Designated Plumber Assignment — Requirements, Forms, and Common Mistakes
Every Washington plumbing contractor must assign a designated plumber to L&I. Learn who qualifies, what Form F627-052-000 requires, and what happens if your DP leaves.
Washington Homeowner Plumbing Exemption — What You Can and Cannot Do Yourself
Washington allows homeowners to do some plumbing on their primary residence, but the exemption has strict limits. Learn what's covered, what voids it, and when you need a permit.
Washington Homeowner Recovery Program — What Contractors Need to Know
Starting July 2026, Washington homeowners can recover up to $25,000 from negligent contractors through L&I's new recovery program. Here's how it works and what it means for your bond.
Washington Journey Level Plumber Requirements — Hours, Exam, and Timeline
Everything needed for Washington PL01 journey-level plumber certification: 8,000 hours, commercial hour split, PSI exam format, and the application process.
Washington Master Plumber Requirements — From Journeyman to Business Owner
Washington master plumber requirements: 2 years of active PL01, an advanced exam, and the path from individual credential to contractor registration.
Washington Plumber Continuing Education — Hours, Categories, and Deadlines
Washington plumbers need 8 hours of CE annually for trainee renewal and specific hour splits for journeyman renewal. Here's the full breakdown.
Washington Plumber Insurance Requirements — Bonds, Liability, and EBIPS
Washington plumbing contractors need a $6,000 surety bond, $250K liability insurance, and EBIPS electronic filing. Here's what each requirement covers and how to set them up.
Washington Plumber License Requirements — Every Level from Trainee to Master
Complete breakdown of Washington plumber license requirements by level: trainee card, specialty, journey-level PL01, and master plumber. Fees, hours, and steps.
Washington Plumber Supervision Rules — The 75% Rule, Remote Supervision, and Trainee Ratios
Washington requires plumber supervisors on-site 75% of the working day. Learn the supervision ratios, remote supervision rules, and when trainees can work with limited oversight.
Washington Plumbing Apprenticeship Programs — Union, Non-Union, and Trainee Pathway Compared
Comparing Washington's plumbing apprenticeship programs: JATC union programs, CITC non-union training, and the self-directed trainee pathway. Costs, hours, pros and cons.
Washington Plumbing Business Registration — Secretary of State, DOR, and L&I
Starting a plumbing business in Washington requires filings with the Secretary of State, Department of Revenue, and L&I. Here's the order of operations and what each filing covers.
Washington Plumbing Code — UPC Adoption, State Amendments, and Local Add-Ons
Washington adopts the Uniform Plumbing Code with state-specific amendments under WAC 296-400A. Here's what plumbers need to know about code compliance.
Washington Plumbing Contractor Registration — Bond, Insurance, and Designated Plumber
How to register as a plumbing contractor in Washington: the $6,000 bond, $250K liability insurance, designated plumber assignment, and EBIPS requirements.
Washington Plumbing Laws — RCW 18.106 and WAC 296-400A Explained
RCW 18.106 and WAC 296-400A are the two legal frameworks governing Washington plumbing. Learn what each covers and how they interact with local building codes.
Washington Plumbing License Renewal — Deadlines, Late Fees, and Reinstatement
Miss your Washington plumbing license renewal and L&I doubles your fee immediately. Here's how renewal, late penalties, and reinstatement actually work.
Washington Plumbing License Verification — How to Check a Plumber's Credentials
Use L&I's Verify a Contractor tool to check any Washington plumber's certification status, bond, insurance, and citation history. Here's exactly how to run the search.
Washington Plumbing Reciprocity — Idaho Agreement, Out-of-State Transfers, and Temporary Permits
Washington has plumbing license reciprocity with Idaho only. Here's how to transfer from any state, including the 120-day temporary permit process.
Washington Plumbing Specialty Licenses — PL02, PL04, PL03, PL03A, PL30, and MG01 Explained
Washington issues six specialty plumbing certifications beyond the journey-level PL01. Learn the hours, scope, and supervision ratios for PL02, PL04, PL03, PL03A, PL30, and MG01.
Washington State Plumbing Trainee Card — Application, Supervision Rules, and Ratios
How to get a Washington plumbing trainee card, what the supervision ratios mean, and whether a trainee can work alone. The full breakdown from L&I rules.