In Texas, the Texas Commission on Environmental Quality (TCEQ) licenses water and wastewater operators in four classes, D (entry) through A. The jump from Class D to Class C is the first big step: it is where most operators move from “trainee” to the working license that most plant and distribution jobs ask for.
Quick answers
What is the difference between a Class D and Class C operator license in Texas?
Class D is TCEQ’s entry license: a high school diploma or GED, the entry course (Basic Water Operations plus Resiliency Overview for water, Basic Wastewater Operation for wastewater) and a passing exam, with no work experience. Class C adds two years of operating experience and more coursework. For water Class C, at least one of the two years must be hands-on (30 TAC §30.390, §30.340).
Do Class C operators earn more than Class D in Texas?
On our board, yes. As of Oct 31, 2026, postings that ask for or accept a Class C have a median posted pay of $25.71/hr (about $53,500/yr) across 21 postings, versus $22.23/hr (about $46,200/yr) across 21 Class D postings. Many postings accept either class, so the groups overlap.
How long does it take to go from Class D to Class C?
Plan on two years of operating experience after you start working, plus the Class C courses for your track. Up to one year can be replaced with college hours or extra approved training: 16 semester hours or 20 extra training hours count as six months (30 TAC §30.340(e)).
How many Texas jobs ask for Class C vs Class D?
As of Oct 31, 2026, 33 open Texas jobs on our board ask for or accept a Class C and 27 ask for or accept a Class D. A posting that names both is counted in each.
Class D vs Class C, side by side
| Class D | Class C | |
|---|---|---|
| Education | High school diploma or GED | High school diploma or GED (a qualifying college degree can cut the experience needed at higher classes) |
| Experience (water) | None | 2 years, at least 1 hands-on, with at least half in the field you are licensing in (surface water, groundwater or distribution) |
| Experience (wastewater) | None | 2 years, at least half in actual domestic wastewater treatment operation or maintenance |
| Training (water) | Basic Water Operations + Resiliency Overview | Track courses for surface water, groundwater or distribution + Resiliency Overview |
| Training (wastewater) | Basic Wastewater Operation | Basic Wastewater + Activated Sludge or Wastewater Treatment + 1 elective |
| Exam | Pass with 70% or higher | Pass with 70% or higher |
| Median posted pay (our board) | $22.23/hr · n=21 | $25.71/hr · n=21 |
License rules: 30 TAC §30.390 (water) and §30.340 (wastewater), as checked Oct 30, 2026. Always confirm current rules with TCEQ before you register.
Not sure where you stand? Our free Texas operator license checker takes your education, experience and courses and shows which class you meet today and what is missing for the next one.
Pay: Class C vs Class D
Across open Texas postings on our board that list pay (Oct 31, 2026), the median for jobs that ask for or accept a Class C is $25.71/hr (about $53,500/yr) (n=21, range of midpoints $19.35/hr to $47.37/hr). For Class D it is $22.23/hr (about $46,200/yr) (n=21, $18.00/hr to $28.23/hr).
Two cautions. First, 13 postings on our board name both classes (often “Class D required, Class C within a set time”), so they count in both groups. Second, these are posted ranges from open jobs, not a survey. For a broader benchmark, the U.S. Bureau of Labor Statistics reports a Texas median of $23.78/hr for all water and wastewater operators (SOC 51-8031, May 2025), across every license class.
How many Texas jobs ask for each class?
Right now we list 33 Texas jobs that ask for or accept a Class C and 27 that ask for or accept a Class D. Some newer contract-operator postings hire at Class D and require Class C within a few years, so read the license section of each posting.
Water/Wastewater Operator
Nexus Water Group (SouthWest Water)
Wastewater Collections Operator II
City of Denton
Apprentice - Facility Operator
Aqua Texas (Essential Utilities)
How to upgrade from Class D to Class C
- Log your hours from day one. Class C needs two years of operating experience. For water, at least one year must be hands-on, and at least half must be in the field you are licensing in.
- Take the Class C courses for your track. Water: surface water, groundwater or distribution track courses plus Resiliency Overview. Wastewater: Basic Wastewater plus Activated Sludge or Wastewater Treatment and one elective.
- Use substitutions if you have them. Up to one year of the experience can be replaced: 16 semester hours or 20 extra training hours equal six months (30 TAC §30.340(e)).
- Apply to TCEQ and pass the exam with at least 70%.
- Re-check your options. Run the license checker again and browse Class C jobs.
Want the whole ladder, D through A? Read how to get a Texas water operator license.
Sources
- 30 TAC §30.390, Qualifications for Initial License (water, Subchapter K)
- 30 TAC §30.340, Qualifications for Initial License (wastewater, Subchapter J)
- TCEQ: Occupational Licenses, Water System Operators
- TCEQ: Occupational Licenses, Wastewater Treatment Plant and Collection System Operators
- BLS OEWS May 2025, Texas, SOC 51-8031 Water and Wastewater Treatment Plant and System Operators
- WaterOperatorJobs.org posting data: open Texas jobs on this site that list pay (see method note below).
Median of the midpoint of each posted pay range, converted to hourly at 2,080 hours a year, from the 60 of 80 Texas postings on our board that list pay (Oct 31, 2026).