Studying for a Vermont water or wastewater operator exam? You're in the right place. Pick your discipline below: each tab has the certification levels, how Vermont names them, and the practice tests that match.
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How Vermont classifies drinking-water operators
Vermont is one of the few states where drinking water and wastewater operators are licensed by two different arms of state government.
Full breakdown in the FAQ below.
Choose your Vermont certification
Groundwater systems (Classes 1A, 1B, 2 and 3)
Vermont Class 1A, Water Operator Practice Test
Class 1A covers transient non-community groundwater systems using ion exchange softening, cartridge filters or limestone contactors. It is the most accessible certification Vermont issues: $45, a high school diploma or GED, no experience, no exam and no continuing education to renew. This practice test is here so you can check your footing before stepping up to a class that does require an exam.
DEC · Class 2 · exam requiredVermont Class 2, Water Operator Practice Test
Class 2 is the first Vermont class with a real gate on it: an $80 fee, 1.5 years of experience, a letter from your supervisor and a written exam. It covers groundwater systems disinfecting with chlorine or UV, softening by ion exchange, or running limestone contactors. Renewal takes 10 training contact hours.
DEC · Class 3 · exam requiredVermont Class 3, Water Operator Practice Test
Class 3 is where groundwater treatment gets complicated. It covers disinfection by means other than chlorine or UV, iron and manganese sequestration, fluoridation, corrosion control installed after a lead or copper action level exceedance, pH control, air stripping, GAC, membrane treatment including reverse osmosis, nanofiltration and ultrafiltration, aeration, and blending for MCL compliance. Same $80 and 1.5 years of experience as Class 2, but 20 training contact hours to renew.
Surface water and GWUDI (Classes 4A, 4B and 4C)
Vermont Class 4B, Water Operator Practice Test
Class 4B is the middle surface water class, covering filtration systems serving 501 to 3,300 people. The experience requirement rises to 2.5 years. Coagulation, flocculation, sedimentation, filter operation, turbidity compliance and disinfection byproduct control.
DEC · Class 4C · more than 3,300 peopleVermont Class 4C, Water Operator Practice Test
Class 4C is Vermont's highest drinking water treatment class, covering surface water filtration systems serving more than 3,300 people, and it takes 3 years of experience. Advanced process control, multi-barrier treatment, and the regulatory load that comes with a larger surface water plant.
Vermont wastewater practice tests
Vermont wastewater licensing is not run by DEC. Act 156 transferred it to the Secretary of State's Office of Professional Regulation on 1 January 2017, and OPR has handled every pollution abatement facility operator license since. DEC still reviews and approves the courses that count for your continuing education, which is why operators end up on both websites. There are 14 licenses in total: Domestic Grades I through V, plus Industrial Paper, Industrial Dairy and Industrial Metal at Grades I, II and IV only. Class 1 facilities are simple processes at low design flow and Class 5 facilities are complex processes above 5.0 MGD. Experience runs 2 years for Grades I and II, 3 for Grade III, 4 for Grade IV and 5 for Grade V, and education can cover up to half of it: a technical certificate is worth up to 6 months, an associate's degree up to a year, a bachelor's up to two years and a master's up to three, provided the degree is in a water-quality field. Education used on your first application cannot be reused when you change grade. Exams run through PSI/AMP, you get one year from approval to pass, and you may retest every 30 days. Licenses run in fixed two-year periods ending 31 July of odd years. Continuing education is 8, 10, 12, 12 and 16 hours for Domestic Grades I to V, and no more than half of it may be online or distance learning. Let a license lapse two years or more and OPR may make you sit the exam again. Vermont also issues provisional licenses valid for up to two years, which is how most operators bank the experience: Grade III and above need 1, 2 or 3 years documented up front, and transitional training runs 10 to 20 hours depending on grade.
Domestic facilities (Grades I through V)
Vermont Domestic Grade I, Wastewater Practice Test
Grade I covers Class 1 facilities, the simplest treatment processes at low design flows. Two years of experience in facility operation plus the Grade 1 exam. Renewal takes 8 hours of approved training per two-year cycle, the lowest requirement of any Vermont wastewater grade.
OPR · Domestic II · 2 yearsVermont Domestic Grade II, Wastewater Practice Test
Grade II also takes two years of experience, but the Grade 2 exam and a more complex class of facility. Renewal takes 10 hours. Secondary treatment, clarification, routine process control and solids handling.
OPR · Domestic III · 3 yearsVermont Domestic Grade III, Wastewater Practice Test
Grade III takes three years of experience and is domestic only; Vermont issues no Grade III on the industrial side. Renewal takes 12 hours. A provisional Grade III license requires one year of documented experience up front.
OPR · Domestic IV · 4 yearsVermont Domestic Grade IV, Wastewater Practice Test
Grade IV takes four years of experience and 12 hours of training per cycle. A provisional Grade IV needs two years of documented experience before OPR will issue it. Advanced process control, nutrient management and permit compliance.
Grade V process practice (Class 5 facilities, over 5.0 MGD)
Activated Sludge, Vermont Grade V Practice
Vermont's Grade V is the top domestic license, covering Class 5 facilities with complex processes and design flows above 5.0 MGD. It takes five years of experience and 16 hours of training per cycle, the most of any grade. Activated sludge control is the core of it.
OPR · Grade V topicSolids and Digestion, Vermont Grade V Practice
Thickening, anaerobic and aerobic digestion, dewatering and biosolids handling at the scale a Class 5 facility runs them.
Industrial facilities (Paper, Dairy and Metal)
Vermont has one distribution certification, Class D, and the rules around it changed on 24 February 2024. Three kinds of system now need a D operator, and they have until 1 July 2029 to have one in place: consecutive systems serving 500 or more people, community systems over 500 in population that have either fire hydrants connected to distribution or transmission or multiple pressure zones owned or operated by the system, and NTNC systems over 500 in population with fire hydrants on the distribution or transmission main. Class D costs $80, takes 1.5 years of experience, a supervisor's letter and an exam, and renews on 20 training contact hours. Vermont also runs a legacy route: if you have already passed a treatment exam for Class 2, 3 or 4 and can document 1.5 years at a system meeting the D definition, you may attend a state-provided class instead of sitting the D exam, but that legacy status is tied to the systems you worked at and does not travel with you to a new employer. From the 2028 renewal, Class D operators must take at least 10 of their 20 hours in Category 1 topics (regulatory, public health, distribution, worksite safety) and at least 6 in Category 2.
Vermont Class D, Water Distribution Practice Test
Class D is Vermont's distribution certification, required from 1 July 2029 for consecutive systems over 500, community systems over 500 with hydrants or multiple pressure zones, and NTNC systems over 500 with hydrants. Mains, storage, pressure zones, water quality in distribution and cross-connection control.
DEC · Class D topicDistribution Fundamentals, Vermont Class D Support
Mains, valves, hydrants, storage and safety basics. Worth working through first if you are coming to Class D from a treatment certification rather than from distribution work.
DEC · Class D topicDistribution Operations, Vermont Class D Support
Main disinfection, flushing, cross-connection control and pressure management. These sit squarely in the Category 1 and Category 2 training topics Vermont now requires for D renewal.
DEC · Class D topicDistribution Hydraulics, Vermont Class D Support
Pumps, pressure and system hydraulics, which Vermont lists as a Category 2 distribution training topic. Also useful for consecutive systems balancing multiple pressure zones.
Vermont does not issue a standalone wastewater collection system certification. The license the state issues is the Pollution Abatement Facility Operator license, which covers operation of the treatment facility, and collection work is handled by the municipality without a separate operator credential. So if you are searching for a Vermont collection certification, the honest answer is that there is not one to hold. The material below is still worth your time. Collection knowledge shows up on the wastewater exams, it is standard content on the reciprocity side if you ever license in a neighboring state such as New Hampshire, New York or Massachusetts, and Vermont's approved course lists lean heavily on regional providers like GMWEA, NEIWPCC and NEWEA whose collection courses count toward your continuing education.
Collection Systems I, Vermont Practice Test
Pipe, manholes, cleaning, safety and confined space awareness. Foundation material that appears on the Vermont wastewater exams even though there is no separate collection license.
Collection · intermediateCollection Systems II, Vermont Practice Test
Lift station operation, inspection and televising, infiltration and inflow, and overflow response.
Collection · advancedCollection Systems III, Vermont Practice Test
Force mains, pump station hydraulics and corrosion control. Useful for operators at Vermont facilities that take flow from long transmission runs.
Collection · highestCollection Systems IV, Vermont Practice Test
System-wide rehabilitation planning, capacity assessment and regulatory compliance. Relevant if you are moving to a state that does license collection separately.
About the Vermont operator exams
Operator certification in Vermont 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 Vermont DEC, Drinking Water and Groundwater Protection Division for water; Vermont Secretary of State, Office of Professional Regulation (OPR) for wastewater). 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 Vermont classify water operators?
Are these the exact questions on the Vermont exam?
Are these practice tests free?
Disclaimer: WaterOperatorPracticeTest.com is an independent study aid. We are not affiliated with Vermont DEC, Drinking Water and Groundwater Protection Division for water; Vermont Secretary of State, Office of Professional Regulation (OPR) for wastewater or any state primacy agency. Always confirm current exam requirements with your state's certification body.