ID Plumber

It is a multiple-choice exam delivered by computer at a testing center. Questions are keyed to the adopted plumbing, fuel gas, and related codes. You will need to look up answers in your code book, so confirm with the Idaho Division of Occupational and Professional Licenses which code editions and reference materials are allowed in the room before test day.

Most candidates find it moderately hard rather than tricky. The difficulty is volume and speed: many questions touch drainage, venting, and sizing, and each requires finding the right section or table. Plumbers who know the code structure and have tabbed their book generally finish comfortably. Those who rely on memory alone often run short on time.

The Idaho Division of Occupational and Professional Licenses sets the current question count and time limit and publishes them with the candidate bulletin. Check its site for the figure that applies to your exam and license tier, since journeyman and contractor-level exams can differ. Practice pacing yourself at roughly a minute per question.

The passing score is set by the licensing body and is published in its candidate information. Do not rely on secondhand numbers from forums or prep courses. Confirm the current passing standard, and whether it is a raw or scaled score, on the Idaho Division of Occupational and Professional Licenses website before you schedule.

Retake rules, waiting periods, and any additional fees are set by the Idaho Division of Occupational and Professional Licenses and can change. Check its site for the current policy rather than assuming a fixed waiting period. In the meantime, review your score report by topic area and rebuild weak sections before rescheduling.

Start with sanitary drainage, vents, and water distribution, which carry the most weight and overlap heavily with daily field work. Then move to fixtures and water heaters, fuel gas piping, and traps and interceptors. Finish with regulations, gray water, and math and plan reading, which are smaller sections but easy points if you practice them.

The usual causes are unfamiliarity with the code book layout, weak table lookups for sizing, and misreading questions that ask for the minimum or maximum allowed. Another common trap is confusing vent and drain requirements. Practicing with the actual index and tabs, and reading each question twice, prevents most of these losses.

No. You need to know where things live. Learn the chapter structure, tab the tables you use most, and practice finding sections fast. Memorizing a handful of key limits, like fixture unit values and common slope requirements, helps, but lookup skill matters more than recall on a multiple-choice code exam.

Application fees, exam fees, scheduling, and identification requirements are published by the Idaho Division of Occupational and Professional Licenses. Those figures change, so go to its website for the current amounts and process. This page is an independent study resource and is not affiliated with the state or its testing vendor.