Montana Water & Wastewater Operator Practice Tests

Heads up: Montana's class numbers run OPPOSITE to the national (ABC) numbering used for our test names. In Montana, Class 1 is the HIGHEST license and Class 4 is entry level, so match your class using the mappings on this page, not the test number. Certification is governed by ARM Title 17, Chapter 40 (administered by DEQ). Five certification categories exist: Water Distribution System Operator (Class 1A-4A), Water Treatment System Operator (Class 1B-4B), Municipal Wastewater System Operator (Classes 1C and 3C only, there is no 2C), Industrial Wastewater Treatment Operator (Class 1D-4D), and On-site Wastewater System Operator (Class 2E-4E). A combined Class 4AB exam covers Very Small Water System operators (groundwater) — one exam, one fee. Full-certification work experience: Class 1 = 2.5 years; Class 2 = 2 years; Class 3 = 1.5 years; Class 4 = 1 year. A HS diploma/GED is required (or a Competency Assessment if no formal education), and up to half the experience requirement may be substituted with engineering training (2 days of training = 1 day of experience). Exams cost $70 each plus a $70 application fee (e.g., applying for 2A + 3B = $210 total). All exams require 70% to pass and must be applied for 30 days in advance with no exceptions. Exams are offered at DEQ offices (Helena, Billings, Missoula, Kalispell), the MRWS Conference, Spring Water School, and Fall Water School. Classes 4 and 5 have been combined — there's no longer a separate Class 5AB. Certificates renew annually by June 30 ($30 drinking-water / $40 wastewater); CEC requirements are biennial (due May 31 of even-numbered years): Class 1 = 20 hrs FC + 10 OT; Classes 2-4 = 10 hrs FC + 5 OT; Class 5 = 4 hrs FC + 2 OT. Temporary Operator Certifications (6 months) are available when systems can't find a fully certified operator. Our practice tests align with the B (treatment) track.

No. These are independent practice tests designed to mirror the technical material and difficulty of the Montana certification exam. The official exam is administered by Montana DEQ (Department of Environmental Quality) — Water and Wastewater Operator Certification Program (or its testing vendor) and the exact questions are not public.

Yes. Every practice test on this site is 100% free, and always will be. To keep it that way, the site may feature sponsors or offer optional paid resources like study courses, but the practice tests themselves stay free.