How to Become a Water Operator in Pennsylvania (PA DEP)

Pennsylvania certifies water and wastewater operators through PA DEP's Bureau of Safe Drinking Water, with certificates issued by the State Board for Certification of Water and Wastewater Systems Operators. Pennsylvania's system is unusual: your certificate is a class plus one or more technology subclasses, and you pass a General exam plus a subclass exam for each treatment technology at your plant. Here's how it works.

Requirements and fees change. Confirm current details on the PA DEP Operator Certification site before applying.

Key takeaways

• Pennsylvania certificates combine a class (A–D, by plant hydraulic capacity) with technology subclasses (e.g., the specific treatment processes a plant uses).
• For drinking-water Classes A–D you must pass Part 1 (General exam) and a Part 2 technology-specific subclass exam for each applicable process. (Classes E, Dc, and Dn are standalone exams.)
• You need a high-school diploma/GED, qualifying experience for the class/subclass, and you apply to the State Board with the fee and a PA State Police criminal-history report.
• Practice with the drinking-water level tests and your Pennsylvania state page.

Step 1 — Understand class vs. subclass

This is the part that trips people up:

• Class (A, B, C, D) is set by the plant's hydraulic design capacity — for example, Class A is for systems above 5 million gallons per day (MGD), and Class B for those above 1 MGD up to 5 MGD. Bigger plant = higher class.
• Subclass is the treatment technology the plant uses. You get certified in the specific processes (subclasses) at the system where you work or want to work.

Your certificate has to cover both the size class and every treatment technology you make process-control decisions on.

Step 2 — Meet the basic requirement

You must be at least a high-school graduate or hold a GED (or have been working in a water/wastewater system before February 21, 2002). Training to prepare for the exam isn't required but is strongly recommended.

Step 3 — Pass the General exam + your subclass exam(s)

For drinking-water Classes A–D, certification requires:

• Part 1 — General Exam, plus
• Part 2 — Technology-Specific (subclass) Exam(s) for each treatment technology that applies to your system.

(Classes E, Dc, and Dn have a single standalone exam.) Register through an Approved Examination Provider (AEP). You'll need 70%-type passing performance on the standardized content.

Prepare by drilling questions and reading the explanation on each. Use our practice tests for the General/fundamentals — start with a 25-question quick quiz and build to the full-length simulation.

Step 4 — Meet the experience requirement

You must meet the work-experience requirement for the class and subclass you want. Higher classes (larger plants) and more complex technologies require more experience. Confirm the exact hours/months with the State Board for your target certificate.

Step 5 — Apply to the State Board

Once you've passed the required exams, submit your application for certification to the State Board with:

• the appropriate fee, and
• a criminal-history record report from the Pennsylvania State Police.

Step 6 — Renew with continuing education

Pennsylvania operators renew on a set cycle and must complete approved continuing education to keep the certificate. Plan your contact hours across the cycle.

A note on the other disciplines

PA DEP also certifies wastewater operators (with their own subclasses such as activated sludge and fixed film) and covers distribution and collection systems. See your Pennsylvania state page and the distribution and collections hubs.

Next steps

1. Confirm your class, subclasses, and current rules on the PA DEP Operator Certification site.
2. Read certification levels explained for how PA's classes fit the national picture.
3. Start practicing from your Pennsylvania state page — and create a free account to save your scores and track weak topics.