Source check: 2026-10-04. Shared WPI courses are linked only where the standardized exam and class match are confirmed. Local grades may not equal WPI class numbers. Your authority's current documents control.
Dedicated prep not yet available
Program authority: Wisconsin Department of Natural Resources (DNR), Operator Certification Program
Local levels: Municipal waterworks: Grade T (Operator-in-Training), Grade 1. Treatment/source subclasses: G - Groundwater; I - Iron removal; L - Lime softening; S - Surface water; V - VOC; Z - Zeolite softening.
Wisconsin uses process-specific subclass exams. Grade 1 adds one year of qualifying experience to the subclass-exam requirement; it is not verified as WPI Class 1. The opened Surface Water guide explicitly documents locally prepared exam questions. No standardized WPI/ABC scope or local-to-WPI class correspondence was established.
No state-matched course is linked for this stream yet.
DNR issues certification under NR 114; lists Grade T and Grade 1 and the G/I/L/S/V/Z subclasses. Study guides provide the objectives covered on exams.
Preface: operators, regulators, educators and local officials jointly prepared the objectives and exam questions for this subclass. References include Wisconsin NR 809, NR 810 and NR 811.
2026 municipal exams are listed separately by subclass: Surface Water has 80 questions; Groundwater, Iron Removal, Lime Softening, VOC Removal and Zeolite Softening each have 40.
Dedicated prep not yet available
Program authority: Wisconsin Department of Natural Resources (DNR), Operator Certification Program
Local levels: Operator-in-Training (OIT), Basic, Advanced. Subclasses: A1 - Suspended Growth Processes; A2 - Attached Growth Processes; A3 - Recirculating Media Filters; A4 - Ponds, Lagoons, and Natural Systems; A5 - Anaerobic Treatment of Liquid Waste; B - Solids Separation; C - Biological Solids/Sludge Handling, Processing, and Reuse; D - Disinfection; L - Laboratory; N - Total Nitrogen; P - Total Phosphorus; U - Unique Treatment Systems.
Normally requires Basic General Wastewater plus at least one process-subclass exam; Special U is exempt from General. Basic adds subclass experience. Advanced requires ten points, including at least four years of hands-on experience; the Advanced exam is one optional points pathway, not universally mandatory. No standardized WPI/ABC adoption or Classes 1–4 mapping was established.
No state-matched course is linked for this stream yet.
Lists OIT, Basic and Advanced, process subclasses, General-plus-subclass requirements and the U exception. A 100-question Advanced exam earns four points toward the ten-point Advanced credential.
Preface ties certification-exam questions to the guide's key knowledges; acknowledgements identify a Wisconsin DNR, WWOA and local operator/trainer workgroup.
Lists separate General, process-subclass and Advanced exams. Wastewater - Unique (Subclass U) is explicitly a short-answer paper exam, unlike the multiple-choice exams.
Dedicated prep not yet available
Program authority: Wisconsin Department of Natural Resources (DNR), Operator Certification Program
Local levels: Grade T (Operator-in-Training), Grade 1; subclass D - Distribution.
Distribution is a separate Wisconsin municipal-waterworks subclass, not a verified WPI Classes 1–4 ladder. Grade 1 requires the subclass exam plus experience, rather than a separately listed higher-grade exam. Local exam-development evidence supports state-specific routing, not standardized or customized ABC attribution.
No state-matched course is linked for this stream yet.
D is Distribution; Grade T requires passing subclass exams, and Grade 1 requires those exams plus one year of satisfactory subclass experience.
Preface says operators, regulators, educators and local officials jointly prepared the subclass objectives and exam questions. Outline covers principles, operation/maintenance, monitoring/troubleshooting, safety and calculations; references Wisconsin NR 809/810/811.
Lists Municipal Waterworks - Distribution as a 40-question exam administered in the 2026 DNR paper-exam program.
Dedicated prep not yet available
Program authority: Wisconsin Department of Natural Resources (DNR), Operator Certification Program
Local levels: Operator-in-Training (OIT), Basic; subclass SS - Sanitary Sewage Collection System. DNR states Basic is the only level required for collection systems; no separate Advanced collection exam is listed.
SS has its own exam and does not require Basic General Wastewater. Certification is required for at least one person where a treatment plant owns its associated collection system; satellite-system certification is voluntary. The overarching wastewater Advanced credential should not be interpreted as a distinct required collection-exam grade. No WPI Classes 1–4 correspondence was verified.
No state-matched course is linked for this stream yet.
Identifies subclass SS; General exam is waived. FAQ distinguishes treatment-plant-owned systems from voluntary satellite systems and states only Basic certification is required.
Guide is specifically for the SS exam, ties questions to its key knowledges and identifies local/DNR contributors. References NR 210.23 CMOM, NR 110, Wisconsin SPS 382 and OSHA 1910.146; satellite certification is not a state requirement.
Current 2026 exam list includes Wastewater - Sanitary Sewer Collection System, 50 questions.
Dedicated prep is not available or being sold yet.