Pennsylvania Wastewater Operator Certification Guide
Pennsylvania certifies wastewater operators through the State Board for Certification of Water and Wastewater Systems Operators, with the program run by DEP under 25 Pa. Code Chapter 302. Pennsylvania doesn't use a single ladder. Your certificate has two parts: a class for the size of system you can run, and a subclass for the treatment technology. You need both to make process control decisions. Here's how it works.
Requirements and fees change. Always confirm the current details on DEP's Operator Certification pages before you apply. This guide is an overview, not the rulebook.
Key takeaways
- Class = size: A (over 5 MGD), B (over 1 to 5 MGD), C (over 100,000 gpd to 1 MGD), D (100,000 gpd or less), and E (satellite collection systems).
- Subclass = technology: 1 activated sludge, 2 fixed film, 3 ponds and lagoons, 4 collection.
- For Classes A to D you pass the General exam plus at least one technology exam. You can take the exams before you have any experience.
- Certificates renew every 3 years, with 30 hours of continuing education (15 in your first cycle).
- Practice with the free Pennsylvania tests, starting with Wastewater Class 1.
Step 1: Work out your class and subclass
The class comes from the system's permitted average daily flow. Class E is for a satellite collection system: collection only, with at least one pump station, sending more than 2,000 gpd to a system owned by someone else.
The subclass is the treatment technology, and every A to D certificate carries at least one:
- Subclass 1: activated sludge
- Subclass 2: fixed film
- Subclass 3: treatment ponds and lagoons
- Subclass 4: single-entity collection system
Class E always pairs with Subclass 4 as a standalone E4 certificate. An A to D operator who also makes decisions about the collection system needs an E4 as well.
There's also an operator Subclass 5, laboratory supervisor, only for people who supervise a PA-accredited lab. It needs a valid operator's certificate, 2 years of experience testing and analyzing environmental samples, and the Part II Lab Supervisor exam.
Step 2: Meet the experience requirement
Every class needs a high-school diploma or GED. Experience comes on one of two tracks.
Track I (high school or GED): 4 years for Class A, 3 for B, 2 for C, and 1 for D and E. Up to half of that can come from education: 10 contact hours of DEP-approved training count as one month, and one college credit counts as 1.5 months.
Track II (with a credential):
| Credential | A | B | C | D/E |
|---|---|---|---|---|
| DEP-approved certificate program | 2 yr | 1 yr | 6 mo | 6 mo |
| DEP-approved associate degree | 1 yr | 6 mo | 6 mo | 6 mo |
| Other science/engineering associate | 3.5 yr | 2.5 yr | 1.5 yr | 6 mo |
| Bachelor's degree | 2 yr | 1 yr | 6 mo | 6 mo |
A year of experience is 220 working days or 1,760 hours, and it can be earned at your requested class or up to two classes lower. Experience carries over between subclasses in one direction: activated sludge counts toward 1, 2 and 3; fixed film toward 2 and 3; lagoon toward 3 only; and collection toward E4 only. Water-system experience can cover at most half of a wastewater requirement.
Step 3: Pass the exams
You register with an Approved Examination Provider, not with DEP, and sessions run at locations around the state (exam schedule). No experience or training is needed to sit for the exams.
- Classes A to D: the Part I General exam plus at least one Part II technology exam.
- Class E4: a standalone collection exam.
- You can take up to 8 tests in one 4-hour session. Bring a non-programmable calculator.
- DEP charges $35 per session, paid when you apply for certification, and the exam provider charges its own fee on top.
- Passing scores stay valid indefinitely, unless you later have to recertify.
DEP sets each exam's passing score by psychometric standard rather than a flat percentage. The free wastewater math practice test and math formulas guide cover the calculations on both exams.
Step 4: Get certified
After you pass, DEP mails your results and the certification application. Send it back with the fee ($150 for A to D, $100 for E) and a Pennsylvania State Police criminal history report dated within 90 days. The Board approves it.
If you've passed but don't have the experience yet, you're an Operator-in-Training: you can work, but you can't make process control decisions on your own. Adding another subclass later means passing its Part II exam plus one more year of experience.
Step 5: Renew every 3 years
Renewal costs $60 every 3 years. Continuing education is 15 hours in your first cycle and 30 after that for Classes A to C, or 8, then 15, for Classes D and E. Hours can't be carried over, and DEP requires a one-time system security course, which counts toward your hours. You can renew up to 24 months after expiration; after that, you must recertify and retest.
Moving to Pennsylvania with a license
You can apply by reciprocity with a valid certificate from another state, territory or DC, earned by passing a comparable exam. The WPI (formerly ABC) Registry and military discharge papers are recognized. The fee is $150 for A to D, or $100 for E, and you must still meet Pennsylvania's experience requirements. Education can't substitute for experience on a reciprocity application.
Next steps
- Check current rules and the exam schedule on DEP's Operator Certification pages.
- Practice the General exam material with Class 1 through Class 4, and the technology exams with activated sludge and fixed film and lagoons. Or try the Pennsylvania wastewater flashcards.
- Working on the water side too? See how to become a water operator in Pennsylvania.
Sources: 25 Pa. Code Chapter 302; DEP operator certification fact sheet (2026), program overview, exam schedule and fees pages. Reviewed October 2026.