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: Mississippi State Department of Health (MSDH), Bureau of Public Water Supply
Local levels: Class A, Class B, Class C, Class D; Class E is the distribution-only/purchased-water classification.
Mandatory waterworks certification uses treatment-based letter classes, not a verified WPI I–IV ladder. The official rules require Bureau examinations; the currently linked handbook establishes PSI delivery and use of an ABC formula table, but neither establishes standardized versus customized ABC/WPI exams or current state-specific exam authorship.
No state-matched course is linked for this stream yet.
Rules 2.2.1 and 2.3.1–2.3.5 identify Classes A–E: A covers surface water/GWUDI, lime softening or specified coagulation/filtration; B covers multiple Class C processes and other advanced treatment; C covers aeration, pH adjustment, corrosion control and closed pressure filtration; D covers chlorination/fluoridation/direct chemical feed. Rule 2.6.1 says the Bureau shall prepare written examinations.
Describes MSDH drinking-water examinations delivered through PSI. Examination Restrictions says the 'ABC Formula & Conversion Table' is provided; it does not identify the examinations as standardized ABC/WPI exams.
Official certification page links the exam handbook and Public Water System Operations Manual; last reviewed March 13, 2025.
WPI exam, class match under review
Program authority: Mississippi Department of Environmental Quality (MDEQ), Wastewater Operator Training and Certification Program
Local levels: Class I, Class II, Class III, Class IV
MDEQ explicitly confirms a 2026 transition to WPI standardized wastewater examinations. Mandatory municipal/domestic treatment certification is verified. However, the opened sources do not expressly identify which WPI class exam corresponds to each Mississippi facility-based class; identical Roman numerals alone are not used as a crosswalk, so shared-level routing remains unverified.
No state-matched course is linked for this stream yet.
'In 2026, MDEQ’s wastewater operator certification program transitioned from our existing wastewater examinations to the standardized wastewater examinations developed by our testing partner, WPI.' It links the 2025 Need-to-Know Criteria and describes criteria 'for each exam level.'
Rule 3.1 requires certified operators for municipal/domestic treatment plants and excludes solely industrial, industry-owned treatment facilities. Rules 3.3–3.4 identify Classes I–IV; I covers stabilization lagoons/septic tank-sand filters, while II–IV vary by process and capacity. Passing Class II is required before sitting Class III or IV.
Lists '2025 Standardized Wastewater Treatment Operator' Classes I, II, III and IV, but provides no Mississippi local-class crosswalk; instructs candidates to confirm appropriate materials with their certifying authority.
Exam route under review
Program authority: Mississippi State Department of Health (MSDH), Bureau of Public Water Supply
Local levels: Class E for distribution-only operators; Class A–D waterworks responsible-charge certificates also encompass their systems' distribution operations. No separate numbered distribution ladder verified.
Distribution certification is offered through the waterworks program, specifically Class E for distribution-only duties. No evidence establishes Class E as any WPI standardized distribution class, or proves standardized/customized/state-specific exam provenance.
No state-matched course is linked for this stream yet.
Rule 2.2.1(1): Class E covers systems that purchase water without additional treatment and 'waterworks operators whose only job responsibility is the operation and maintenance of the distribution system(s).' Rule 2.3.5 requires the Bureau's written examination. The responsible-charge definition includes treatment plants, wells and distribution systems.
All-classifications introduction assigns the certified operator responsibility for treatment facilities and distribution systems. Class E duties include residual checks past the master meter and within distribution.
PSI administration and an ABC formula table are documented, but standardized distribution exam adoption and Class E correspondence are not.
Exam route under review
Program authority: Mississippi Department of Environmental Quality (MDEQ), Wastewater Operator Training and Certification Program
Local levels: Class I-C; Class II-C (voluntary collection-only certification)
Collection certification and its exact local grades are explicitly verified. MDEQ's umbrella 2026 standardized-wastewater transition notice does not expressly name collection exams or map I-C/II-C to WPI Collection I/II. Collection exam provenance therefore remains unverified, not unsupported or not-offered.
No state-matched course is linked for this stream yet.
Rule 3.3 explicitly lists I-C and II-C as 'Collection only (voluntary)': I-C up to 1,000,000 GPD, II-C greater than 1,000,000 GPD. Rule 3.4 separately requires a written exam for both classes.
The state program says certification is offered in 'four (4) classes of treatment and two (2) classes of collection based on size and type of facility.'
Announces transition to standardized WPI 'wastewater examinations' in 2026, without separately identifying collection exams or their class correspondence.
Lists standardized Wastewater Collection Classes I–IV; does not map Mississippi I-C or II-C to those exams.
Dedicated prep is not available or being sold yet.