Studying for a New Hampshire water or wastewater operator exam? You're in the right place. Pick your discipline below: each tab has the certification levels, how New Hampshire names them, and the practice tests that match.
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How New Hampshire classifies drinking-water operators
New Hampshire runs both programs through NHDES. The water works side has five grades rather than the usual four: Grade 1A is the most basic tier, then Grades I, II, III and IV, with IV the highest.
Full breakdown in the FAQ below.
Choose your New Hampshire certification
Water Works Operator (Grade 1A, then Grades I through IV)
New Hampshire Grade 1A, Water Works Practice Test
Grade 1A is New Hampshire's most basic water works tier, sitting below Grade I. It is the grade most often held at very small systems, and it is the reason New Hampshire has five grades where most states have four.
NHDES · Grade INew Hampshire Grade I, Water Works Practice Test
Grade I is the first full water works grade. New Hampshire counts upward, so Grade I is near the bottom and Grade IV is the top.
NHDES · Grade IINew Hampshire Grade II, Water Works Practice Test
Grade II covers treatment at a working-operator level. Remember that treatment and distribution are classified separately here, so the grade follows the facility you are responsible for.
NHDES · Grade IIINew Hampshire Grade III, Water Works Practice Test
Grade III moves into more complex treatment and larger systems.
NHDES · Grade IV (highest)New Hampshire Grade IV, Water Works Practice Test
Grade IV is New Hampshire's highest water works grade, for the largest and most complex facilities in the state.
New Hampshire wastewater practice tests
NHDES certifies wastewater treatment facility operators in four grades, I through IV, with Grade I the lowest and Grade IV the highest. Grading follows the complexity of the facility and its design flow rather than the operator's preference, and each grade carries an operator-in-training variant for people working toward it. Examinations are held on the first Wednesday of June and of December at the Franklin Training Facility, and the pass mark is 70 percent. Collection systems are handled separately and voluntarily through NEWEA, covered under Collections.
New Hampshire Grade I, Wastewater Practice Test
Grade I is the entry wastewater grade. Every New Hampshire wastewater grade has an operator-in-training variant, which is the usual route in while you build experience.
NHDES · Grade IINew Hampshire Grade II, Wastewater Practice Test
Grade II covers conventional secondary treatment and routine process control.
NHDES · Grade IIINew Hampshire Grade III, Wastewater Practice Test
Grade III moves into advanced biological treatment, nutrient removal and solids handling.
NHDES · Grade IV (highest)New Hampshire Grade IV, Wastewater Practice Test
Grade IV is New Hampshire's highest wastewater grade, for the most complex facilities and the largest design flows.
New Hampshire classifies distribution separately from treatment on the water works side, so a distribution system carries its own classification and you hold the grade that matches it. An operator looking after both a plant and the mains behind it is dealing with two separate classifications rather than one combined license. The grades themselves are the same ladder, Grade 1A at the bottom through Grade IV at the top, and exams pass at 70 percent.
New Hampshire Grade I, Water Distribution Practice Test
Entry distribution material: mains, valves, hydrants, storage and safety basics.
NHDES · Grade IINew Hampshire Grade II, Water Distribution Practice Test
Main disinfection, flushing, cross-connection control and pressure management.
NHDES · Grade IIINew Hampshire Grade III, Water Distribution Practice Test
Hydraulics, pumping and storage operation, and distribution system water quality.
NHDES · Grade IV (highest)New Hampshire Grade IV, Water Distribution Practice Test
System-wide planning, capital work and regulatory compliance for the largest distribution networks.
New Hampshire does not issue a state license for wastewater collection system operators. Certification is voluntary and administered by the New England Water Environment Association, exactly as in Massachusetts. It is still worth holding, because New Hampshire municipalities regularly ask for it in job postings even though the state does not require it. The material below is the collection body of knowledge those NEWEA exams draw on.
NEWEA Collection Grade 1, New Hampshire Voluntary Certification
Entry collection material: pipe, manholes, basic maintenance and confined space awareness.
NEWEA · voluntaryNEWEA Collection Grade 2, New Hampshire Voluntary Certification
Cleaning and inspection, lift station operation, infiltration and inflow, overflow response.
NEWEA · voluntaryNEWEA Collection Grade 3, New Hampshire Voluntary Certification
Pump station hydraulics, force mains, odor and corrosion control, rehabilitation methods.
NEWEA · voluntaryNEWEA Collection Grade 4, New Hampshire Voluntary Certification
Asset management, capacity assurance, capital planning and regulatory reporting.
About the New Hampshire operator exams
Operator certification in New Hampshire 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 NHDES (New Hampshire Department of Environmental Services), Water Works Operator Certification and Wastewater Operator Certification). 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
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Disclaimer: WaterOperatorPracticeTest.com is an independent study aid. We are not affiliated with NHDES (New Hampshire Department of Environmental Services), Water Works Operator Certification and Wastewater Operator Certification or any state primacy agency. Always confirm current exam requirements with your state's certification body.