Studying for a Michigan water or wastewater operator exam? You're in the right place. Pick your discipline below: each tab has the certification levels, how Michigan names them, and the practice tests that match.
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Choose your certification
How Michigan classifies drinking-water operators
Michigan runs drinking-water operator certification through EGLE's Operator Training and Certification Unit under Act 399 of 1976 and Part 19 of the administrative rules (R 325.11910–11915).
Full breakdown in the FAQ below.
Choose your Michigan certification
F, Filtration (full surface-water treatment)
Michigan F-4, Filtration Practice Test
F-4 is the entry filtration certification for a community water supply, needing 60 education points and only 3 experience points. Remember that Michigan numbers downward, so F-4 is the starting point and F-1 is the top.
EGLE-OTCU · F-3Michigan F-3, Filtration Practice Test
F-3 is the second step up the filtration ladder. Like every F exam it carries a written laboratory component in addition to the multiple-choice paper, and a practical lab exam follows once you pass.
EGLE-OTCU · F-2Michigan F-2, Filtration Practice Test
F-2 covers advanced surface-water treatment. The points table tightens considerably here, and most operators reach it with a mix of college credit and several years of plant time.
EGLE-OTCU · F-1 (highest)Michigan F-1, Filtration Practice Test
F-1 is Michigan's highest drinking-water classification: 80 education points, equivalent to high school plus two years of college, and 60 experience points. This is the certification for the largest and most complex filtration plants in the state.
D, Limited Treatment (chemical addition, no filtration)
S, Distribution
Michigan S-4, Distribution Practice Test
S-4 is the entry distribution certification. S is fully separate from F and D, so distribution experience will not qualify you for a treatment certification or the other way around.
EGLE-OTCU · S-3Michigan S-3, Distribution Practice Test
S-3 covers mains, storage, pumping and cross-connection control at a working-operator level. Many Michigan operators pair S-3 with D-3 and pay two exam fees to do it.
EGLE-OTCU · S-2Michigan S-2, Distribution Practice Test
S-2 moves into hydraulics, system design review and water-quality management across a large distribution network.
EGLE-OTCU · S-1 (highest)Michigan S-1, Distribution Practice Test
S-1 is the top distribution certification, covering system-wide planning, capital work and regulatory management for Michigan's largest supplies.
Michigan wastewater practice tests
Michigan certifies municipal wastewater operators under Part 41 of NREPA (1994 PA 451) and its rules at R 299.2901 and following. There are seven classifications rather than four: A, B, C and D for conventional treatment plants, L1 and L2 for waste stabilization lagoon facilities, and SC as a special classification. Michigan enforces a strict ladder on the upper classes, so you must hold the class below before you may sit the A, B or C exam. Exams run twice a year, usually May and November. Certificates are issued for between 36 and 39 months, and renewing a C, D, L2 or L1 certificate takes at least 1.2 CECs of board-approved continuing education during the cycle. Note that lagoon operators get a break: passing L2 automatically grants L1.
Municipal Wastewater Treatment (Classes D, C, B, A)
Michigan Class D, Wastewater Practice Test
Class D is the entry municipal wastewater certification. Michigan runs these exams twice a year, in May and November, alongside the drinking-water sittings.
EGLE · Part 41 · Class CMichigan Class C, Wastewater Practice Test
Class C is the first of the levels with a stepping-stone rule attached: you must already hold the class below before you may sit the C exam.
EGLE · Part 41 · Class BMichigan Class B, Wastewater Practice Test
Class B covers advanced biological treatment and solids handling. The same rule applies, so C must be in hand first.
EGLE · Part 41 · Class AMichigan Class A, Wastewater Practice Test
Class A is Michigan's highest municipal wastewater certification. An Associate degree in Water Resources Management, or in Water and Wastewater Treatment Technology, satisfies the education requirement for both A and B.
Lagoon Systems (Classes L1 and L2)
Distribution in Michigan is the S certification, and it is genuinely separate from the F and D treatment certifications rather than a lower rung of the same ladder. It has its own exam, its own fee and its own five levels, counting down from S-1 at the top to S-4 as the community entry level, with S-5 covering noncommunity (Type II) supplies. Experience does not transfer between the categories, so time spent in distribution will not qualify you for an F or D certification. Operators who need to cover both a well and the mains behind it commonly hold an S and a D together and sit two exams to get there.
Michigan S-4, Water Distribution Practice Test
Entry-level distribution: mains, valves, hydrants, storage basics and safety.
EGLE-OTCU · S-3Michigan S-3, Water Distribution Practice Test
Working-operator distribution material including disinfection of mains, flushing and cross-connection control.
EGLE-OTCU · S-2Michigan S-2, Water Distribution Practice Test
Advanced hydraulics, pump and storage operation, and distribution water quality.
EGLE-OTCU · S-1 (highest)Michigan S-1, Water Distribution Practice Test
System-wide planning, capital programs and regulatory compliance for the largest supplies.
This is new. Michigan's collection (sewer) system and retention treatment basin operator certification requirements took effect on 29 April 2026 under Part 41, following a rule development process that ran across eighteen stakeholder meetings and set facility classification levels, operator requirements and the exam question pool. Until this rule, Michigan certified wastewater treatment operators but did not require a separate certification to run the collection system feeding them. If you operate a Michigan sewer system or an RTB, check EGLE's implementation timeline for the deadline that applies to your facility class. The material below is the collection body of knowledge those exams draw on.
Michigan Collection System, Entry Level Practice
Pipe, manholes, basic maintenance, safety and confined space awareness.
Part 41 · new 2026 ruleMichigan Collection System, Operating Level Practice
Cleaning and inspection, lift station operation, infiltration and inflow, and overflow response.
Part 41 · new 2026 ruleMichigan Collection System, Senior Level Practice
Pump station hydraulics, force mains, odor and corrosion control, and rehabilitation methods.
Part 41 · new 2026 ruleMichigan Collection System, Manager Level Practice
Asset management, capacity assurance, capital planning and regulatory reporting, including the CSO, SSO and RTB obligations Michigan tracks closely.
About the Michigan operator exams
Operator certification in Michigan covers several disciplines, drinking water, wastewater, distribution, and collections, which may be handled by the same agency or by separate programs (drinking water is administered by EGLE (Michigan Department of Environment, Great Lakes, and Energy), Operator Training and Certification Unit (OTCU)). The exact certification structure, exam format, levels, and continuing-education requirements vary by discipline and change over time, so always confirm the current scope and eligibility directly with the certifying agency. Our practice content focuses on the underlying technical material: the same operating principles, math, regulations, and process knowledge that show up on water and wastewater operator exams nationwide.
Frequently asked questions
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Disclaimer: WaterOperatorPracticeTest.com is an independent study aid. We are not affiliated with EGLE (Michigan Department of Environment, Great Lakes, and Energy), Operator Training and Certification Unit (OTCU) or any state primacy agency. Always confirm current exam requirements with your state's certification body.