New York · Water Treatment · IIA
New York Grade 2 Water Treatment Operator Exam
The New York Grade 2 water treatment certification is designated IIA and issued by NYS Department of Health (drinking water); NYS Department of Environmental Conservation (wastewater). Intermediate certification for operators running day-to-day operations at small to mid-size systems.
Applied math is a significant part of the New York IIA exam.
Practicing calculations like dosage, detention time, and loading before test day is one of the most effective ways to prepare, alongside reviewing your state’s official exam content outline.
Exam facts
| Grade level | IIA |
|---|---|
| Questions | 100 |
| Time limit | 150 minutes |
| Passing score | 70% |
| Difficulty | Intermediate |
| Exam administered by | NYS DOH / DEC (in-house exams) |
Prerequisites for IIA
- Grade 1 certification (in most states)
- 1–2 years of operating experience
Confirm exact requirements with NYS Department of Health (drinking water); NYS Department of Environmental Conservation (wastewater).
What's on the exam
- Coagulation and flocculation
- Sedimentation and clarification
- Filtration (conventional, direct, membrane)
- Disinfection and disinfection byproducts
- Corrosion control and stabilization
- Source water and watershed protection
- Process control adjustments
- Applied treatment math
The math on the Water Treatment exam
These calculations are commonly included in water treatment operator exam preparation and may appear on your exam depending on your certification level and state. Practicing them is one of the most effective ways to prepare.
- Chemical dosage (mg/L to lbs/day)
- Chlorine demand and CT calculations
- Detention time
- Filter loading and backwash rate
- Flow rate and velocity
- Percent strength of solutions
Free IIA practice questions
Sample questions with full explanations at this level.
Take the practice quiz →Frequently asked questions
- What is the New York Grade 2 water treatment certification called?
- In New York, the Grade 2 water treatment certification is designated IIA, issued by NYS Department of Health (drinking water); NYS Department of Environmental Conservation (wastewater).
- How many questions are on the exam and what score do I need?
- The exam has about 100 questions with a 150-minute time limit, and you need 70% to pass. It is administered by NYS DOH / DEC (in-house exams).
- What are the prerequisites for IIA in New York?
- Typical prerequisites: Grade 1 certification (in most states); 1–2 years of operating experience. Exact requirements are set by NYS Department of Health (drinking water); NYS Department of Environmental Conservation (wastewater).