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.
Exam route under review
Program authority: Iowa Department of Natural Resources, Water Supply Operations Section
Local levels: Grade I, Grade II, Grade III, Grade IV (application uses 1–4). Grade A PWS is cross-referenced to the small-system distribution classification, not established as a separate treatment exam.
Mandatory DNR certification. DNR links ABC preparation and WPI need-to-know resources, but the opened sources do not explicitly identify Iowa's exams as standardized rather than customized or establish local-grade-to-WPI-class correspondence.
No state-matched course is linked for this stream yet.
WSO is responsible for certifying public water supply treatment and distribution operators; Exam Preparation links Water Treatment, Water Distribution, Wastewater to ABC.
81.4 lists water treatment Grades I–IV; its Grade A PWS footnote refers to 81.5(3). Revision effective June 18, 2025.
Resources includes a link labeled 'WPI Exam Need -to-Know Documents'; it does not state standardized-exam adoption or grade correspondence.
Exam route under review
Program authority: Iowa Department of Natural Resources, Water Supply Operations Section
Local levels: Grade W (onsite treatment); Grade IL (lagoon); Grade I, Grade II, Grade III, Grade IV.
Mandatory DNR certification, including lagoon and onsite pathways. Standardized/customized/state-specific status remains unverified for every grade. The older application lists 'Wastewater Lagoon 1 2'; do not turn those older labels into current WPI mappings or assume a separate current Grade IIL.
No state-matched course is linked for this stream yet.
WSO certifies 'Wastewater and lagoon operators'; wastewater is separately included in the ABC exam-preparation link.
81.3 assigns W to onsite treatment, IL to stabilization lagoons, IL/I to aerated lagoons, II to advanced aerated lagoons, and II–IV to specified mechanical processes; 81.3(3) says I–IV certificates satisfy IL requirements.
04/2024 form lists Wastewater Treatment 1–4 and Wastewater Lagoon 1–2, but contains no standardized-exam assertion; it predates the June 2025 rule revision.
Exam route under review
Program authority: Iowa Department of Natural Resources, Water Supply Operations Section
Local levels: Grade A; Grade I, Grade II, Grade III, Grade IV (ordinary exam application uses 1–4).
Mandatory DNR certification. Grade A is a distinct small-system pathway requiring department-approved training. ABC/WPI preparation links do not establish standardized exams, the Grade A exam source, or Grades I–IV equivalence to WPI classes.
No state-matched course is linked for this stream yet.
81.5 lists distribution Grades I–IV and separately defines Grade A for qualifying small systems with no treatment beyond hypochlorination or specified nonadjustable treatment; 81.6 requires an approved course for Grade A.
Explicitly names distribution within WSO certification responsibilities and ABC exam-preparation resources, without identifying standardized versus customized examinations.
Exam route under review
Program authority: Iowa Water Environment Association (IAWEA), Collection System Operator Certification Program - voluntary
Local levels: Grade 1, Grade 2, Grade 3, Grade 4.
A voluntary IAWEA credential, not the DNR treatment certification. IAWEA offers paper exams and links an ABC collection guide. Neither source explicitly establishes current standardized WPI/ABC adoption rather than customization, or maps IAWEA grades to WPI classes. Do not label collection not-offered merely because it is outside DNR Chapter 81.
No state-matched course is linked for this stream yet.
Heading: 'Voluntary Collection System Operator Certification Program'; certification has four levels from Grade 1 to Grade 4; paper exams are offered at spring and fall conferences.
Guide derives from ABC's 2010 national job analysis and describes ABC Classes I–IV. It does not explicitly identify IAWEA's adopted exam type or its local grade correspondence.
Dedicated prep is not available or being sold yet.