State exam · Idaho
Idaho operator practice tests
Idaho's licensing rule says it directly: the examination for all types and classes of licensure is validated and provided by the Association of Boards of Certification (ABC), with a 70% minimum passing score. Class I is Idaho's standard entry class for drinking water treatment, distribution, and wastewater treatment — and TradeQBank's Class I banks are built to those same WPI blueprints. Start with a free 25-question sample.
Idaho operator certification at a glance
- Agency: Idaho Board of Drinking Water and Wastewater Professionals (Division of Occupational and Professional Licenses).
- Exam: Idaho's rule (IDAPA 24.05.01) states the examination for all types and classes of licensure is validated and provided by ABC; the minimum passing score is 70%.
- Entry class: Class I for Drinking Water Treatment, Drinking Water Distribution, and Wastewater Treatment. (Operator-in-Training and Very Small Water/Wastewater classes sit below Class I.)
- Eligibility basics: high school diploma or GED, plus 1,600 hours of on-site operating experience at a Class I or higher system — or completion of a one-year approved apprenticeship.
Which practice bank matches your Idaho exam?
| TradeQBank bank (326 questions, $49) | Your Idaho exam | Try it free |
|---|---|---|
| Water Treatment Class I bank | Idaho Drinking Water Treatment Class I | Free sample |
| Wastewater Treatment Class I bank | Idaho Wastewater Treatment Class I | Free sample |
| Water Distribution Class I bank | Idaho Drinking Water Distribution Class I | Free sample |
Every bank includes practice by content area and a timed mock exam, and every answer is source-cited and independently verified — see our method. All three banks together are $99 with all-access. For the exam format and a study plan, see the exam guide.
Practice tests for other states
TradeQBank publishes a state page only where the state's own board confirms it uses the standardized WPI exams our banks are built to. Verified so far:
- Alabama operator practice tests
- Georgia operator practice tests
- South Carolina operator practice tests
- Virginia operator practice tests
- Ohio operator practice tests
- Arizona operator practice tests
- Colorado operator practice tests
- Utah operator practice tests
- Nevada operator practice tests
- Washington operator practice tests
- Oregon operator practice tests
- Iowa operator practice tests
- New York operator practice tests
State facts checked October 26, 2026 against Idaho's licensing rules, IDAPA 24.05.01 (adminrules.idaho.gov). Source: IDAPA 24.05.01 — Idaho licensing rules. If your state isn't listed, the banks still rehearse the national WPI Class I blueprints — but check your board's exam provider before relying on that.
FAQ
Common questions
Does Idaho use the ABC/WPI standardized operator exams?
Yes. Idaho's licensing rule states verbatim that the examination for all types and classes of licensure will be validated and provided by the Association of Boards of Certification (ABC), with a minimum passing score of 70%.
What class does a new Idaho operator start at?
Class I is the standard entry class for drinking water treatment, drinking water distribution, and wastewater treatment. Below it sit the Operator-in-Training designation and the Very Small Water and Wastewater classes.
What experience does Idaho Class I require?
1,600 hours of on-site operating experience at a Class I or higher system, or completion of a one-year approved apprenticeship, plus a high school diploma or GED. The Board makes all licensing decisions; TradeQBank is independent practice material.