Wisconsin Water & Wastewater Operator Practice Tests

Wisconsin's municipal waterworks certification uses just two grade levels: **Grade T (Operator-in-Training)** and **Grade 1**. All publicly owned waterworks are assigned a Grade of 1. Operators must hold subclass certifications matching the processes at their plant. The seven actual subclasses are: **D** (Distribution), **G** (Groundwater), **I** (Iron removal — oxidation and filtration), **L** (Lime softening), **S** (Surface water), **V** (VOC removal — air stripping, GAC), and **Z** (Zeolite softening). Grade T requires passing the appropriate subclass exam(s); Grade 1 additionally requires one year of experience (1,000 hours minimum for part-time). Class S waterworks must have a Grade T or Grade 1 Surface-water operator on duty during all operations. Renewal every 3 years. Continuing education: 18 hours per renewal cycle for both Grade T and Grade 1; 24 hours required for surface-water operators-in-charge. Max 6 hours of health/safety training per renewal period. Exam fee $25 per exam; renewal fee $45 (+ $25 late penalty). One-year reinstatement window after certification expires. Governing rule: Wisconsin Administrative Code Chapter NR 114. A separate Small Water System (OTM/NN) operator certification covers smaller systems.

No. These are independent practice tests designed to mirror the technical material and difficulty of the Wisconsin certification exam. The official exam is administered by Wisconsin DNR (Department of Natural Resources) — Operator Certification Program (or its testing vendor) and the exact questions are not public.

Yes — every practice test on this site is free, with no paywall. The site is supported by affiliate partnerships with established water operator training providers (announced when ready) — but the practice tests themselves stay free.