If you have spent years reading code to pass inspections, becoming the person who signs the inspection card is a natural next step. This guide explains how to become a plumbing inspector: what states require, which certification exams you will face, what the job pays, and how to decide whether it is the right move for you.
What a plumbing inspector does
Plumbing inspectors check that piping systems for drinking water, sanitary waste and similar services are installed to code. The federal O*NET profile for construction and building inspectors lists plumbing inspector as one of its job titles, with tasks such as:
- Inspecting plumbing during and after construction for safety and code compliance.
- Watching installations to confirm they are done correctly.
- Reviewing plans and specifications.
- Issuing permits for construction, demolition or occupancy.
In practice, a municipal plumbing inspector's day is a route of rough-in, underground, top-out and final inspections, plus plan review, office time and phone calls with contractors. Some jurisdictions use combination inspectors who cover plumbing, mechanical, electrical and building.
Plumbing inspector requirements: three state examples
There is no single national rule. Some states license plumbing inspectors directly. Others rely on national certifications such as ICC's, and cities often add hiring rules of their own. These three examples show the range.
Texas: license, or 500 credited hours
Texas issues a Plumbing Inspector license through the State Board of Plumbing Examiners. Under 22 Tex. Admin. Code 363.8, you qualify if you hold a journeyman or master plumber license, an out-of-state plumbing inspector license with substantially equivalent requirements, or a Texas engineer or architect license. Applicants without those credentials can qualify with 500 hours of plumbing training or experience. Credits include 100 hours each for items such as UPC or IPC certification, a medical gas endorsement or backflow tester certification, and up to 200 hours for verified trade work. The exam fee is $55, the license is $55, and it renews annually.
Oregon: years as a licensed journeyman
Oregon's rule OAR 918-695-0400 sets several inspector levels. A residential plumbing inspector can qualify as an Oregon journeyman plumber or through other routes, such as an apprenticeship certificate plus two years as a licensed journeyman. The broader Plumbing Specialty Code Inspector, which covers commercial work, generally requires four years as an Oregon journeyman, or two years plus a commercial practicum. There is also a limited inspector certification for building sewers. All levels require a passing score of 75 percent, and Oregon counts one year of experience as 2,000 hours.
Maryland: four years and a board exam
Maryland's State Board of Plumbing certifies plumbing inspectors who are licensed master or journey plumbers with at least four years as an inspector or craftsman in a building trade. Applicants pass a board exam and must put any master license on inactive status before certification, which keeps inspectors from also contracting.
| State | Credential | Main experience route | Notable detail |
|---|---|---|---|
| Texas | Plumbing Inspector license | Journeyman or master license, or 500 credited hours | $55 exam, annual renewal |
| Oregon | Residential, Specialty Code and limited sewer inspector | Licensed journeyman time, often 2 to 4 years | 75% passing score; separate Oregon Inspector Certification also needed |
| Maryland | Plumbing Inspector certification | Master or journey license plus 4 years | Master license must go inactive |
ICC plumbing inspector exams: P1 and P2
Many cities and states that do not run their own inspector license require or prefer International Code Council certification. Even where it is not required, it signals you know the model code.
- P1 Residential Plumbing Inspector. According to ICC's P1 content outline, the exam has 60 multiple-choice questions in two hours and is open book. Content weights are general requirements 14%, fixtures 8%, water heaters 12%, water supply and distribution 21%, sanitary drainage 23% and vents 22%. It is based on the plumbing chapters of the International Residential Code.
- P2 Commercial Plumbing Inspector. ICC's P2 outline lists 60 questions in 2.5 hours, open book, on the International Plumbing Code. It adds traps and interceptors, storm drainage, health care plumbing and water heater gas piping and venting to the residential topics.
Open book does not mean easy. Two minutes per question leaves little time to search. Tab your code book by chapter, highlight tables you use often, and practice finding answers against a clock. If your jurisdiction uses the UPC instead, see our UPC vs. IPC comparison, since the exam and code book you study should match where you will work.
Plumbing inspector salary and job outlook
The Bureau of Labor Statistics does not publish plumbing inspectors separately. They fall under construction and building inspectors, with these May 2025 figures:
| Measure | Construction and building inspectors | Plumbers, pipefitters, steamfitters |
|---|---|---|
| Median annual pay | $74,690 | $63,800 |
| Lowest 10% | Under $47,140 | Under $44,150 |
| Highest 10% | Over $114,200 | Over $108,420 |
| Jobs (2025) | 153,900 | 510,600 |
| Projected change, 2025 to 2035 | 0% (little or no change) | 7% |
Plumber figures are from the BLS plumber profile. Inspectors still have about 14,800 openings a year, mostly to replace people who retire or change jobs. BLS notes that remote inspections may reduce demand in state and local government, which is worth weighing.
The median comparison is not the whole picture. An experienced journeyman or master plumber working overtime or running service calls may already earn more than a starting inspector. What inspection usually offers instead is regular business hours, less wear on your body and, in government jobs, public-sector benefits.
Who hires plumbing inspectors
According to BLS, local government (excluding education and hospitals) employs about 36 percent of construction and building inspectors, engineering services about 19 percent, and construction about 9 percent. That means:
- City and county building departments are the main employers. Expect posted job announcements, civil service exams in some places, background checks and probationary periods.
- Third-party inspection firms work for jurisdictions that contract out inspections or plan review.
- State agencies handle inspections in some states, especially for state-owned buildings or areas without local inspectors.
Most postings also require a valid driver's license, and many expect continuing education to keep certifications current.
How to become a plumbing inspector, step by step
- Get licensed as a plumber. A journeyman license is the most common starting point. Our plumber career ladder guide covers the hours.
- Build broad experience. Residential, commercial, underground, water heaters, gas if your state allows it. Inspectors see everything, and BLS notes that experience in a trade is usually required.
- Earn code-heavy credentials. Backflow tester, medical gas or similar certifications strengthen your application, and in Texas they count directly toward the 500-hour route.
- Check your target jurisdiction. Read the state rule and a few local job postings to see which license or ICC certification they ask for.
- Pass the exam. Take P1 for residential roles, P2 for commercial, or your state's own exam.
- Apply to building departments and third-party firms. Watch city job boards; inspector openings are often posted there and nowhere else.
Is plumbing inspection right for you?
| Inspection fits you if | Stay on the tools if |
|---|---|
| You like code and enjoy explaining it | You enjoy building and solving problems hands-on |
| Your knees and back need a break | You want the highest possible income from overtime or a business |
| You want regular hours and public benefits | You dislike bureaucracy and documentation |
| You can say no to people you used to work beside | You would find failing a friend's job too uncomfortable |
That last row matters more than people expect. Inspectors fail work, sometimes from contractors they know. Consistency and fairness are the job.
What carries over from the field, and what you will have to learn
Years on the tools give you something no exam can: you know how work gets hidden. You know where a missing cleanout or a poorly supported line is likely to be, and which shortcuts crews take on a deadline. That instinct is the main reason departments hire from the trade.
Some skills will be new. Inspectors write corrections that a contractor, an owner and sometimes a lawyer will read, so clear written notes that cite the code section matter. Plan review means reading drawings for compliance before anything is built, which leans on the same isometric and sizing skills you learned as an apprentice, applied to someone else's design. And you will spend more time on software, permits and scheduling than you did on a job site. If you have run crews or done estimating, you already have a head start on the paperwork side.
Bottom line: Becoming a plumbing inspector usually means getting licensed, building several years of varied experience, then passing your state's exam or ICC's P1 or P2. The median pay is higher than the plumber median, the hours are steadier and the work is easier on your body, but job growth is flat and the top earners in the field can still out-earn inspectors. If you like the code book as much as the pipe wrench, it is a strong second act.