NH Grade 1 Wastewater Operator
Study Guide | Certification, Safety
& Treatment Fundamentals
2026/2027
, What score is required to pass the NH 70% correct or higher.
wastewater operator written exam?
How many wastewater operator Four: Grade I, II, III, and IV.
certification grades are there in New
Hampshire?
What does a Grade I certificate qualify A Grade I wastewater treatment plant.
an operator to supervise?
What education is required for full High school graduation or a high school equivalency
Grade I certification? (HSE/GED) credential.
How much operating experience is 1 year.
required for full Grade I certification?
Is operating experience required before No. NH rules allow the Grade I exam to be taken
taking the Grade I examination? without prior operating experience.
What is an Operator-in-Training (OIT)? Someone who has met the examination and education
requirements for a grade but has not yet completed the
required operating experience.
What is the purpose of lockout/tagout To isolate hazardous energy so equipment cannot
(LOTO)? unexpectedly start or become energized during service.
What oxygen concentration is Less than 19.5% oxygen.
considered oxygen-deficient?
Name three common atmospheric Hydrogen sulfide, methane, and low oxygen.
hazards in wastewater confined spaces.
Study Guide | Certification, Safety
& Treatment Fundamentals
2026/2027
, What score is required to pass the NH 70% correct or higher.
wastewater operator written exam?
How many wastewater operator Four: Grade I, II, III, and IV.
certification grades are there in New
Hampshire?
What does a Grade I certificate qualify A Grade I wastewater treatment plant.
an operator to supervise?
What education is required for full High school graduation or a high school equivalency
Grade I certification? (HSE/GED) credential.
How much operating experience is 1 year.
required for full Grade I certification?
Is operating experience required before No. NH rules allow the Grade I exam to be taken
taking the Grade I examination? without prior operating experience.
What is an Operator-in-Training (OIT)? Someone who has met the examination and education
requirements for a grade but has not yet completed the
required operating experience.
What is the purpose of lockout/tagout To isolate hazardous energy so equipment cannot
(LOTO)? unexpectedly start or become energized during service.
What oxygen concentration is Less than 19.5% oxygen.
considered oxygen-deficient?
Name three common atmospheric Hydrogen sulfide, methane, and low oxygen.
hazards in wastewater confined spaces.
