How to Become a Water Operator in Michigan
Michigan's operator-certification system has one feature that catches newcomers off guard: beyond an exam, certification requires a set amount of college-level education (which experience can substitute for). Both drinking water and wastewater are run by the Michigan Department of Environment, Great Lakes, and Energy (EGLE), but through different units and rule sets. Here's how to earn your first certificate.
Key takeaways
- Drinking water is certified by EGLE's Operator Training and Certification Unit (OTCU); wastewater by EGLE's Water Resources Division.
- Drinking-water license types: Complete Treatment (F), Limited Treatment (D), and Distribution (S), each graded 1–4 — and note Michigan inverts the usual order: Level 1 is the most advanced and Level 4 is entry level. Level 5 covers the smallest noncommunity systems.
- Exams are offered twice a year — May and November — and you need 70% to pass.
- The top grades carry a college requirement: the highest treatment grade (F-1) needs a high school diploma plus two years of college credit (or 60 semester hours); lower grades need a high school diploma/GED, and experience can substitute for education.
- Wastewater (municipal) uses Classes A, B, C, D, plus L1, L2, and SC, and you must hold the next-lower level before testing at A, B, or C.
- Get ready with our free Michigan practice tests.
Step 1: Choose drinking water or wastewater
Michigan runs the two disciplines separately. The certificate you need is tied to the classification of the facility you'll operate.
Drinking water (EGLE OTCU). There are three exam categories, each graded 1 to 4, plus a Level 5:
- Complete Treatment — "F" (Filtration) — full treatment plants
- Limited Treatment — "D" — limited treatment processes
- Distribution — "S" — distribution systems
- Level 5 — for noncommunity (Type II) systems, the smallest public supplies
Important: Michigan inverts the usual grade order. Here, Level 1 is the most advanced classification and Level 4 is the entry level for community water supplies — the opposite of the ABC-standard convention used in most states. The grade you need matches your system's size and complexity.
Wastewater (EGLE Water Resources Division). Municipal wastewater certification is offered in Classes A, B, C, and D, plus L1 and L2 (lagoon systems) and SC. There's a laddering rule: you must earn certification at the next-lower level before you can sit for the A, B, or C exam. Certification is required by Michigan's Part 41 administrative rules for operating a classified facility.
Step 2: Meet the education and experience requirements
This is the Michigan-specific hurdle. Michigan grades applicants on education points and experience points, and the bar rises sharply at the top. The highest treatment grade, F-1, specifically requires a high school education or equivalent plus two years of college credit or the equivalent — a degree or a minimum of 60 semester hours. Entry-level grades are far more accessible: a high school diploma or GED covers the education points for the entry tier, and excess operating experience can be substituted for education as you move up. Higher grades simply require more of both.
The practical takeaway: in Michigan, education and experience aren't just nice-to-haves that speed things up (as in some states) — they're part of qualifying to be certified at a given grade. Check EGLE's "Requirements for Certification" document for the exact education-plus-experience combination for the grade you want.
Step 3: Apply and pass the exam
EGLE administers certification exams twice a year, in May and November. You submit a separate exam application for the certification type you want (Distribution, Limited Treatment, Complete Treatment, or Level 5), and your application must be approved before you're allowed to sit for the exam — so apply early. Approval/denial letters typically go out about a month before the exam date.
The exam is graded against a passing score of 70%. Location preference is first come, first served, so submitting early also improves your odds of testing at a convenient site. Watch the common application mistakes EGLE flags: unsigned applications, missing supervisor signatures on experience, and blank job-duty fields are all automatic denials.
Step 4: Keep your certificate current with continuing education
Michigan drinking-water certificates renew on a 3-year cycle, and the continuing-education requirement scales with your certification level. The minimum training hours to renew are 24 hours for the highest levels (1 or 2), 24 hours for level 3, 12 hours for level 4, and 9 hours for level 5 — with most of those hours required to be technical and/or managerial. (Michigan often expresses these as CECs, where 1.0 CEC = 10 contact hours.) Courses must be board-approved, and wastewater renewal has its own continuing-education requirements set by the Water Resources Division. EGLE offers webinars and in-person courses through its training calendar and tracks your hours in its online system (OTCIS).
Moving to Michigan with an out-of-state license?
You may be able to certify in Michigan based on your existing credential rather than starting over. See our certification reciprocity guide for how reciprocity works in general, and the certification levels explained guide for how Michigan's F/D/S grades compare to the ABC-standard levels used elsewhere.
Start practicing
Michigan's exams draw on the same operator fundamentals tested nationwide, so practice in the format you'll see on test day. Take our free, ABC/WPI-aligned practice tests for drinking water, wastewater, distribution, and collections, or go straight to Michigan practice tests. Comparing states? See how to become a water operator in Texas and the full guides library.
This guide explains Michigan operator certification and is a free study aid, not legal advice. Requirements, license types, fees, and renewal rules are set by EGLE and change over time. Always confirm current requirements with EGLE's operator-certification programs before relying on them. Reviewed June 2026.