Studying for a West Virginia water or wastewater operator exam? You're in the right place. Pick your discipline below: each tab has the certification levels, how West Virginia names them, and the practice tests that match.
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How West Virginia classifies drinking-water operators
West Virginia runs both water and wastewater operator certification out of one place, the Certification and Training Program inside the Office of Environmental Health Services.
Full breakdown in the FAQ below.
Choose your West Virginia certification
Specialty certifications below Class I (1D and Class R)
Class I through IV (must be earned in sequence)
West Virginia Class I, Water Operator Practice Test
Class I covers community and non-transient non-community systems on a groundwater source serving under 10,000 people, including consecutive connections, that do not treat for an identified primary contaminant. It also covers transient non-community groundwater systems that use gaseous chlorine or chlorine dioxide or treat for nitrate or nitrite. You start with an OIT certification to get here. Renewal takes 12 CEHs.
OEHS · Class II · 2,000 hoursWest Virginia Class II, Water Operator Practice Test
Class II covers three situations: a groundwater system under 10,000 that treats for a primary contaminant or runs a 40 CFR 141.73 treatment technique, a groundwater system at 10,000 or more that does not, or any surface water or GUDI system under 10,000. Applicants working at a Class I system may bank 2,000 hours there plus an approved course instead of finding 2,000 hours at a Class II. From Class II up, half the experience can be substituted with education. Renewal takes 24 CEHs.
OEHS · Class III · 10,000 to 20,000 SWWest Virginia Class III, Water Operator Practice Test
Class III covers groundwater systems above 10,000 that treat for a primary contaminant or run a treatment technique, and surface water or GUDI systems serving at least 10,000 but fewer than 20,000. Conventional surface water treatment, filtration, turbidity compliance and disinfection byproduct control. Renewal takes 24 CEHs.
OEHS · Class IV · 20,000 and overWest Virginia Class IV, Water Operator Practice Test
Class IV is West Virginia's highest water certification, covering community and non-transient non-community systems on a surface water or GUDI source serving at least 20,000 people, including consecutive connection population, with treatment. Advanced process control, plant-wide optimization and regulatory compliance. Renewal takes 24 CEHs.
West Virginia wastewater practice tests
West Virginia wastewater certification runs under 64CSR5, through the same Certification and Training Program that handles drinking water. Classification is by permitted flow capacity and treatment complexity, and there are seven classes rather than four. Class H and Class S sit below Class I and cover lagoons, ponds, recirculating media filters and package plants, split at 600 gpd, with Class S running up to 0.05 MGD. Class C is the collection system certification and is covered under Collections. Then Class I runs from 0.05 to 1.0 MGD, Class II from 1.0 to 1.75 MGD, Class III from 1.75 to 6.0 MGD, and Class IV from 6.0 MGD up. Extended aeration plants are handled separately inside those bands, sitting in Class I between 0.05 and 0.1 MGD and Class II from 0.1 to 1.75 MGD. On top of all that sits the Advanced designation, which is not a class but an add-on to a Class S or Class I through IV certification for facilities using membrane filtration, separate nitrification, denitrification, phosphorus removal, ammonia stripping, breakpoint chlorination, carbon adsorption, chemical coagulation, flocculation, precipitation, or demineralization by ion exchange, reverse osmosis or electrodialysis. Exams are administered through the training provider on the last day of the course, and you must wait at least 60 days after a failed attempt before reapplying.
Small systems (Class H and Class S)
Class I through IV (by permitted flow capacity)
West Virginia Class I, Wastewater Practice Test
Class I covers lagoons, aerated lagoons, stabilization ponds and wastewater systems with flows above 0.05 MGD up to 1.0 MGD. It also picks up extended aeration package plants between 0.05 and 0.1 MGD. Basic secondary treatment, sampling and reporting.
OEHS · Class II · 1.0 to 1.75 MGDWest Virginia Class II, Wastewater Practice Test
Class II covers facilities above 1.0 MGD up to 1.75 MGD, plus extended aeration plants from 0.1 MGD up to 1.75 MGD. Note the overlap: an extended aeration plant sits in a different class from a conventional plant at the same flow, which is a distinction worth getting right.
OEHS · Class III · 1.75 to 6.0 MGDWest Virginia Class III, Wastewater Practice Test
Class III covers facilities with flows above 1.75 MGD but below 6.0 MGD. Activated sludge control, clarification, solids handling and process troubleshooting at a mid-size plant.
OEHS · Class IV · 6.0 MGD and overWest Virginia Class IV, Wastewater Practice Test
Class IV is West Virginia's highest wastewater classification, covering facilities at or above 6.0 MGD. Plant-wide optimization, permit compliance and the operational judgment a large treatment works demands.
Advanced designation (held in addition to Class S or Class I through IV)
West Virginia does have a distribution certification, WDS, but it is narrower than the distribution licenses most states issue. Under 64CSR4 a WDS system is one that gets all of its water from another public water system, is not owned or operated by that supplier, has no other source, and does no treatment beyond supplemental chlorine. Retreat with anything other than chlorine and the system becomes at least a Class I. A WDS-certified operator may only work within the distribution system or perform distribution-related functions at a Class I or higher system. The sequencing rule matters here. WDS does not count toward Class I, so an operator who wants to move up starts again with an Operator-in-Training certification. Both WDS and OIT renew on six continuing education hours every two years. Backflow prevention assembly testers are certified separately under 64CSR25 through the same program.
West Virginia WDS, Water Distribution System Practice Test
WDS is the certification for systems that buy all their water and do nothing to it beyond supplemental chlorine. Mains, storage, valves, hydrants, pressure management and distribution water quality. Note that WDS is not a stepping stone to Class I; that path starts over with an OIT.
OEHS · OIT / WDS topicDistribution Fundamentals, West Virginia OIT Support
Mains, valves, hydrants, storage and safety basics. This is the ground you cover as an Operator in Training before sitting either the WDS or the Class I exam.
OEHS · WDS topicDistribution Operations, West Virginia WDS Support
Main disinfection, flushing, sampling and pressure management, plus the supplemental chlorination a WDS system is allowed to run.
OEHS · Class I topicDistribution Hydraulics, West Virginia Class I and Up
Pumping, storage turnover and system hydraulics for operators doing distribution work at a Class I or higher system.
West Virginia is one of the states that does certify collection system operators. Under 64CSR5 the certification is Class C, defined as a facility upstream of the wastewater treatment plant used to collect and convey wastewater, including pumps, valves, manholes, tanks and other appurtenances. Class C explicitly does not cover Class S facilities, which are the small package plants, lagoons and managed septic districts up to 0.05 MGD. Class C is not a rung on the Class I through IV ladder either. It is its own certification for its own kind of facility, so an operator running both a collection system and a treatment plant holds two certifications. The four practice tests below work the same Class C material at increasing depth.
West Virginia Class C, Collection Fundamentals Practice Test
Pipe, manholes, cleaning, safety and confined space awareness. The foundation material for the West Virginia Class C collection system certification.
OEHS · Class C · operationsWest Virginia Class C, Collection Operations Practice Test
Lift station operation, inspection and televising, infiltration and inflow, and overflow response. Pumps, valves, manholes and tanks are named in the Class C definition.
OEHS · Class C · advancedWest Virginia Class C, Advanced Collection Practice Test
Force mains, pump station hydraulics and corrosion control, which matter in West Virginia's steep terrain where long force main runs are common.
OEHS · Class C · large systemsWest Virginia Class C, Large System Collection Practice Test
System-wide rehabilitation planning, capacity assessment and regulatory compliance for a large collection network.
About the West Virginia operator exams
Operator certification in West Virginia covers several disciplines, drinking water, wastewater, distribution, and collections, which may be handled by the same agency or by separate programs (drinking water is administered by WV DHHR Office of Environmental Health Services (OEHS), Certification and Training Program; water under 64CSR4, wastewater under 64CSR5). The exact certification structure, exam format, levels, and continuing-education requirements vary by discipline and change over time, so always confirm the current scope and eligibility directly with the certifying agency. Our practice content focuses on the underlying technical material: the same operating principles, math, regulations, and process knowledge that show up on water and wastewater operator exams nationwide.
Frequently asked questions
How does West Virginia classify water operators?
Are these the exact questions on the West Virginia exam?
Are these practice tests free?
Disclaimer: WaterOperatorPracticeTest.com is an independent study aid. We are not affiliated with WV DHHR Office of Environmental Health Services (OEHS), Certification and Training Program; water under 64CSR4, wastewater under 64CSR5 or any state primacy agency. Always confirm current exam requirements with your state's certification body.