Louisiana Operator Certification (LDH): Classes & Exams

Louisiana certifies both water and wastewater operators through the Louisiana Department of Health (LDH) Operator Certification Program, working with the state Committee of Certification. The rules are in LAC 48:V, Chapter 73. Two things make Louisiana different from most states: it has a separate Water Production certificate, and it measures your qualifications in points instead of years. Here's how it works.

Requirements and fees change. Always confirm the current details on the LDH Operator Certification Program page before you apply. This guide is an overview, not the rulebook.

Key takeaways

• LDH certifies five categories: Water Production, Water Treatment, Water Distribution, Wastewater Treatment, and Wastewater Collection, each in Class 1 to Class 4 (4 is highest).
• You need a high-school diploma or GED, then qualification points: 1 for Class 1, 2 for Class 2, 5 for Class 3, 8 for Class 4.
• Exams are given at LDH sessions around the state, about once a month. You need 70% to pass, the fee is $5 per exam, and you must pass Class 1 first, then each class in order.
• Practice with the Louisiana tests, starting with Water Production Classes 1-2.

Step 1: Figure out which certificates your job needs

Louisiana sizes every class by population served:

• Class 1: under 1,000
• Class 2: 1,001 to 5,000
• Class 3: 5,001 to 25,000
• Class 4: over 25,000

The category depends on what you run. Water Production is required at every water system. Water Treatment is added for surface water plants and for groundwater systems that do more than simple disinfection. Water Distribution covers the pipes from the plant to the customer. On the sewer side, Wastewater Treatment covers the plant and Wastewater Collection covers everything else in the sewerage system.

So a small groundwater system that only chlorinates needs Production and Distribution, but not Treatment.

Step 2: Earn your qualification points

Every class requires a high-school diploma or GED, plus points from experience and education. LDH's How to Get Points sheet spells it out:

• One year of qualifying operator experience = 1 point. Supervisory experience counts 1.5 a year, related experience 0.5.
• One year of college (30 semester hours) = 1 point. Training hours count at 0.0025 points per hour.
• Classes 1 and 2 can be earned on experience alone.
• Classes 3 and 4 cap any single source at 75% of the required points. In practice that means 3.75 points of experience at most for Class 3 (so at least 1.25 from education), and 6 at most for Class 4 (at least 2 from education).

New hires who don't qualify yet can apply for an Operator-in-Training (OIT) certificate, good for 24 months while LDH tracks your hours and training. If you pass an exam before you have the points, LDH issues a provisional certificate and you convert it once you qualify. Neither one lets you serve as a system's designated operator.

Step 3: Pick an exam and apply

LDH posts its exam schedule for the year. There are two kinds of session:

• Open exams: no course required. In 2026 there were three, including one at the Louisiana Rural Water Association conference.
• Closed exams: you must first finish an approved 32-hour exam prep course (Water 1-2, Water 3-4, Wastewater 1-2, or Wastewater 3-4).

First-time applicants must use the paper exam application, sent by email, fax, or mail at least 30 days before the exam. LDH doesn't send confirmations; it posts exam authorization letters on the program page about a week ahead, and you have to bring a printed letter. The $5 per exam fee is paid on site after you test.

Step 4: Pass the exam

Louisiana writes its own exams, and LDH publishes a Need to Know outline for each category on the program page. You need 70%. If you fail, you wait 90 days before retaking that exam, and after three failures you must take a 40-hour course.

You can't skip classes. Exams go in order from Class 1 to Class 4, and you can't test more than one class above what you currently qualify for.

LDH also publishes its own exam math sheet. Work your practice problems from that sheet so it looks familiar on test day. If math is your weak spot, I teach the same formulas step by step in the operator math course.

For practice: Water Production 1-2, Water Production 3-4, Water Treatment Class 1, Distribution Class 1, Wastewater Treatment Class 1, and Collection Class 1. The 30-day study plan lays out a schedule.

Step 5: Get the certificate

Once you pass and meet the points, you apply for the certificate. Water and wastewater are billed separately: $20 for the first certificate in each and $10 for each additional one. Every first application also includes LDH's short Certification Law and Rules exam, which you complete and return before your certificate is issued.

Step 6: Renew every two years

Certificates renew on a two-year cycle, split by last name (A to J and K to Z). You need 16 contact hours of approved training per cycle for water (or 8 per certificate, whichever is more, so 24 if you hold all three water certificates) and 16 hours for wastewater. LDH doesn't get hours automatically from training providers. You submit them to the program.

Moving to Louisiana with a license

LDH can grant reciprocity without an exam for a comparable certificate from another state, at the committee's discretion and usually only if you work for a Louisiana utility. The reciprocity packet asks your current state's certification officer to verify your license directly.

Next steps

1. Check current rules, forms, and exam dates on the LDH Operator Certification Program page and in the Operator Certification Rule.
2. Read certification levels explained to see how Louisiana's classes compare with other states.
3. Start practicing from the Louisiana state page, and create a free account to save your scores and track your weak topics.