Florida Wastewater Operator License: Class D to A Steps
Florida licenses domestic wastewater treatment plant operators through the Florida Department of Environmental Protection (FDEP) Operator Certification Program, under Chapter 62-602 of the Florida Administrative Code. The ladder runs the opposite way from the national numbering: Class D is entry, Class A is the top. And you can't skip rungs. Here's how to climb it.
Requirements and fees change. Always confirm the current details on FDEP's Operator Certification Program page before you apply. This guide is an overview, not the rulebook.
Key takeaways
- Florida wastewater licenses run Class D (entry) to Class A (highest).
- Every class needs a high-school diploma or GED. Classes C, B and A each need an FDEP-approved course, and B and A need an active license one class lower just to sit the exam.
- Exams are computer-based at PSI test centers. You need 70%, and a passing score counts toward a license for 4 years.
- Licenses renew every 2 years, all due April 30 of odd-numbered years.
- Practice with the free Florida tests, starting with Class D.
Step 1: Know the classes
Plants are rated by process (Category I for nutrient removal or membranes, II for activated sludge, III for extended aeration and oxidation ditches, IV for trickling filters and RBCs) and by permitted capacity, which sets the class. Larger plants need a higher-class lead operator and more hours of staffing. A Class A plant needs a Class A lead operator and round-the-clock staffing. Class D plants are small Category III and IV plants of 2,000 to 25,000 gallons per day.
Step 2: Meet the requirements
| Class | To sit the exam | To get the license |
|---|---|---|
| D | HS diploma or GED (course optional) | Approved Class D course plus 1 hour of experience under a licensed operator, or 3 months of experience |
| C | HS/GED + approved Class C course (within 5 years) | 2,080 hours (1 year) |
| B | HS/GED + approved Class B course + active Class C | 6,240 hours (3 years) |
| A | HS/GED + approved Class A (management) course + active Class B | 10,400 hours (5 years) |
Three rules worth knowing:
- No education substitution. A degree or college credits can't replace experience hours. The only exception FDEP lists is military service credit.
- Courses expire. A course completed more than 5 years before the exam no longer counts toward eligibility, and a third-party prep course can't replace the FDEP-approved one.
- Some experience doesn't count, including work at septic-, lagoon- or filter-bed-only systems, lab-only work, and sludge hauling.
Step 3: Take the exam
Once FDEP approves your application, you schedule with PSI (FDEP's exam vendor) at a test center. There are no fixed exam dates, and you can test before you have the experience.
- Classes A, B and C: 100 multiple-choice questions in 3 hours.
- Class D: 50 questions in 2 hours.
- A formula sheet is provided. You need 70%, and you get your grade on the spot.
- Fees: $100 for Classes A to C, or $75 for Class D (in each case, $25 of it is a non-refundable application fee).
- Your passing score counts toward a license for 4 years. After that, you'd have to retest.
Brush up on the math with the wastewater operator math formulas guide and the free wastewater math practice test.
Step 4: Apply for the license
Passing the exam doesn't license you. You file a separate license application once you have the hours, with a fee of $100 for Classes A to C or $50 for Class D. Your experience must be verified by an FDEP-licensed operator of the same type, or by a peer reference letter. A letter from HR alone isn't enough. Your license and wall certificate arrive in about 4 weeks.
Step 5: Renew every 2 years
Every Florida license expires on April 30 of odd-numbered years. You need continuing education each cycle: 2.0 CEUs (20 hours) for Class A or B, 1.0 for Class C, and 0.5 for Class D. You can't split CEUs between licenses or repeat the same course in back-to-back cycles.
Renewal costs $75 (Classes A to C) or $50 (Class D). A license that lapses becomes inactive, with higher fees to reactivate, and if it isn't reactivated by the end of the next cycle it becomes null and void and you start over.
Moving to Florida with a license
Florida offers licensure by reciprocity if you hold an active license from another state, territory, tribe or federal program that required a diploma, comparable experience, and a proctored, closed-book exam of at least 50 questions with a 70% pass mark (reciprocity FAQ). The fee is $100, and it's waived for the Armed Forces. Foreign licenses don't qualify.
Next steps
- Check current rules and approved courses on FDEP's Operator Certification Program page.
- Practice: Class D, Class C, Class B, Class A, or the Florida wastewater flashcards. The 30-day wastewater study plan lays out a schedule.
- Working on the water side too? See how to become a water operator in Florida.
Sources: FDEP Operator Certification Program pages and handbook (2026); Rules 62-602 and 62-699, F.A.C.; ss. 403.865-403.876, F.S. Reviewed October 2026.