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: Indiana Department of Environmental Management (IDEM), Office of Water Quality, Drinking Water Operator Certification Program
Local levels: Water treatment 1 (Class WT1), Water treatment 2 (Class WT2), Water treatment 3 (Class WT3), Water treatment 4 (Class WT4), Water treatment 5 (Class WT5). Linked rule guidance additionally lists Water treatment 6 (Class WT6), an emerging-technology classification; a separate current WT6 exam is not verified.
IDEM explicitly developed its own peer-reviewed exams, completed in April 2016, and continues maintaining them. Its current page identifies five treatment exams. WT numbers are not WPI class equivalencies.
No state-matched course is linked for this stream yet.
‘IDEM completed the development of our own peer-reviewed operator certification exams in April 2016’; ‘five water treatment exams with corresponding certifications.’ Lists WT1, WT2, WT3 and WT4 & WT5 study guides.
Names Classes WT1–WT6. WT4 and WT5 concern surface water/GWUDI; WT6 concerns newly emerging treatment technology determined by the commissioner.
Exam route under review
Program authority: Indiana Department of Environmental Management (IDEM), Office of Water Quality, Wastewater Operator Certification Program
Local levels: I-SP, Class I, Class II, Class III, Class IV; A-SO, Class A, Class B, Class C, Class D. Wastewater Apprentice is an additional designation using the same certification examination, not a separate exam grade.
IDEM documents ten local exams and an IDEM-maintained question bank. This establishes a local examination system but does not explicitly identify question provenance or distinguish independently authored state exams from customized ABC forms. No WPI-standardized scope or WPI-class crosswalk was verified; Ivy Tech delivery is not proof.
No state-matched course is linked for this stream yet.
Applicants choose ‘which of the ten exams’ to take. ‘IDEM maintains a question bank’ from which questions are drawn for A-SO, I-SP and the other eight exams. Wastewater Apprentice applicants take ‘the same certification examination.’ References 327 IAC 5-23.
Lists official study-guide groupings: Classes I & A; Class II; Classes III & IV; Classes B, C, & D; I-SP; A-SO. States the IDEM formula sheet is provided during the exam.
Dedicated prep not yet available
Program authority: Indiana Department of Environmental Management (IDEM), Office of Water Quality, Drinking Water Operator Certification Program
Local levels: Distribution system small (Class DSS); Distribution system medium (Class DSM); Distribution system large (Class DSL).
The official exam-development statement expressly covers three distribution exams, separately from treatment. DSS/DSM/DSL must not be converted into WPI Classes 1–3.
No state-matched course is linked for this stream yet.
Describes IDEM's ‘own peer-reviewed operator certification exams’ and states: ‘There are three distribution type exams with corresponding certifications.’ Links the Indiana Drinking Water Operator Training Distribution Manual.
Explicitly names Distribution system small (Class DSS), medium (Class DSM), and large (Class DSL), with population and system-complexity criteria.
WPI exam, class match under review
Program authority: Indiana Water Environment Association (IWEA), Wastewater Collection Systems Committee - voluntary certification program
Local levels: Class I; Class II; Class III; Class IV. The linked program document also describes In-Training certification for eligible higher-class applicants.
The current IWEA portal explicitly verifies standardized ABC Testing/WPI collection exams, unlike the other streams. The linked program document identifies this as voluntary IWEA certification, not IDEM treatment certification. Local Classes I–IV are established, but the opened sources do not explicitly match each local grade to a named WPI exam class; shared-level routing remains unverified.
No state-matched course is linked for this stream yet.
‘The Collection System exam is standardized test provided by ABC Testing, a WPI service.’ Lists Class I/II and Class III/IV application categories and 2026 exam dates, and directly links WPI standardized collection exam materials.
Calls the program ‘voluntary’; says ‘ABC provides the standardized testing materials’ and IWEA administers the program within Indiana. Names Classes I, II, III and IV and requires the appropriate certification examination.
States Need-to-Know Criteria outline WPI standardized examination content provided through ABC Testing. Links both 2025 and 2019 collection criteria, without stating which edition IWEA currently administers.
Dedicated prep is not available or being sold yet.