New York Water Operator Certification Guide

Overview

New York's water operator certification program is administered by the New York State Department of Health (NYSDOH), specifically through the Center for Environmental Health. New York has a layered certification system that accounts for both the size of the system being operated and the source water type — reflecting the state's enormous range of water systems, from the massive filtration-exempt NYC watershed to small upstate groundwater systems serving a few hundred people.

New York administers its own exams and does not use the ABC standardized exam for most categories. The state has specific study materials and references, and the regulatory framework you'll need to know is New York's Part 5, Subpart 5-1 of the Sanitary Code, along with 10 NYCRR Part 170.

License types & subclasses

New York's certification structure has two main dimensions: the license type (what kind of system you're operating) and the grade (the complexity and size of the system).

• Water Treatment — Subclass S (Surface Water) — Surface water treatment plants including conventional filtration, direct filtration, and membrane systems. Typically the most complex operations in the state.
• Water Treatment — Subclass G (Groundwater) — Groundwater treatment facilities including iron/manganese removal, softening, and 4-log treatment systems.
• Water Distribution — Subclass D (Distribution) — Distribution system operations including pumping, storage, pressure management, and system maintenance.
• Wastewater — Separate licensing track administered through NY DEC (not NYSDOH) for wastewater treatment operators.

License grade comparison

Each license type uses a Grade 1 through Grade 4 system, with Grade 1 being entry-level and Grade 4 the highest. The grade required corresponds to the classification of the water system you're responsible for operating.

For surface water systems (Subclass S), Grade 4 is required for operators responsible for large, complex filtration plants — including high-rate filtration, ozone treatment, and advanced disinfection systems. New York City's water system operates under its own special regulatory framework, but operators at NYC facilities still need appropriate NY DOH certification.

Experience requirements

New York's experience requirements are tied to both the grade level and the subclass. Surface water experience (Subclass S) and groundwater experience (Subclass G) are tracked separately and may not always be interchangeable when qualifying for a higher grade in one subclass.

Experience must be verified by your employer on the application. New York requires that experience be accrued at a regulated community water system — private wells, non-community systems, and wastewater systems typically do not count toward drinking water operator certification.

How to apply

1. Download the application from the NY DOH drinking water certification page
2. Select your target license type (treatment subclass or distribution) and grade
3. Complete the application and have your employer(s) verify your experience
4. Include education documentation if claiming a substitution
5. Submit with applicable fee (verify current fee schedule with NY DOH)
6. NY DOH reviews eligibility and issues exam authorization
7. Schedule and pass the NY DOH exam
8. License issued upon exam pass and application approval

Exam information

New York administers its own operator licensing exams through the NY DOH Center for Environmental Health. These are state-specific exams covering New York's regulatory framework alongside technical operations content.

Renewal requirements

New York water operator licenses renew on a 3-year cycle. CEU requirements must be met through NY DOH-approved continuing education.

The AWWA New York Section and the New York Water Environment Association (NYWEA) are the two primary professional organizations offering approved continuing education for New York operators. Many utilities also sponsor in-house training that qualifies for CEU credit.

Study resources

• NY DOH study references — Exam candidate study materials specific to each subclass and grade. Start here.
• 10 NYCRR Part 5, Subpart 5-1 — New York's primary drinking water regulations. Essential for Grade 3 and Grade 4 exams.
• 10 NYCRR Part 170 — New York's operator certification rules. Reading these helps you understand the requirements you're navigating.
• AWWA New York Section — Training events, workshops, and exam prep resources for New York operators.
• NYWEA — New York Water Environment Association; useful for operators pursuing wastewater certification as well.
• RandyAI — Ask Randy about NY DOH certification requirements, the subclass system, grade exam prep, or 3-year renewal.