Licensed plumbers
Exempt from the WTS license, per TCEQ. Water treatment work is subject to inspection and approval as provided by applicable state law or city ordinance.
Texas plumbers and plumbing companies
Water Treatment Training and Licensing for Plumbers in Texas
The first question a Texas plumber asks about water treatment is not how to sell it. It is whether they are allowed to install it. The answer is in two places: the plumbing law and TCEQ's Water Treatment Specialist rules.
Here is what each one says, in plain English, with the source for every line.
Short answer
Do You Need a License to Install a Water Softener in Texas?
If you install water treatment equipment under contract, you need a TCEQ Water Treatment Specialist (WTS) license unless you are exempt, and licensed Texas plumbers are exempt. TCEQ lists individuals licensed under Occupations Code Chapter 1301, the plumbing license law, among those who do not need the WTS license.
It also works the other way. The plumbing law says a plumbing license is not required for water treatment installations, exchanges, services or repairs, other than treating rainwater to supply a plumbing fixture or appliance. So a WTS licensee can install water treatment without being a plumber.
Non-plumbers under contract
Need a TCEQ Water Treatment Specialist license at the class that matches the work.
Homeowners
The WTS rule applies to work done under contract. The plumbing law separately exempts a property owner doing plumbing in their own homestead.
If your crew includes people who are not licensed plumbers, confirm with TCEQ how the exemption applies before they install on their own.
TCEQ
The Water Treatment Specialist License Classes
| Class | What it allows | Experience and training |
|---|---|---|
| Class I | Exchange and regeneration of portable tanks, and regeneration of nonportable tanks, under the supervision of a higher class | No education, experience or training required |
| Class II | Installations, exchanges, services and repairs. Reverse osmosis and deionization only under the supervision of a higher class. | 3 years of experience with no diploma, 2 years with a high school diploma or GED, or 1 year with 32 college semester hours. Basic Water Conditioning course. |
| Class III | Everything Class II allows, including reverse osmosis and deionization equipment | 3 years with a high school diploma or GED, 2 years with 64 college semester hours, or 1 year with a degree. Basic and Advanced Water Conditioning courses. |
- Exam: computer-based, for every class.
- Application fee: $111. Testing centers may charge their own fee on top.
- Term: the license is valid for three years.
- Renewal: 12 hours of continuing education. Under TCEQ's Chapter 30 rule changes, licenses that expire on or after September 1, 2025 can be renewed up to 180 days late, at 1.5 to 2 times the fee.
Common mix-up
The Water Supply Protection Specialist Endorsement Is Not a Softener License
The Texas State Board of Plumbing Examiners offers a Water Supply Protection Specialist endorsement to licensed master and journeyman plumbers. It takes a 24-hour course and an exam. It covers customer service inspections and plumbing for rainwater treatment and distribution. TSBPE's description does not mention softeners, filters or RO systems, and TCEQ's exemption for licensed plumbers does not depend on it.
Training in Texas
Where Texas Plumbers Get Water Treatment Training
Basic Water Conditioning (TCEQ course 0691) is required for Class II and Class III WTS licenses. The Texas Water Quality Association offers a TCEQ-approved version: 6 contact hours, online by WebEx several times a year and in person once a year. Early registration is $150 for members and $300 for non-members, and $200 and $350 late. TWQA notes it can also count toward the 12 renewal hours.
The HALO Water Tour comes to Dallas November 3-5, 2026: three consecutive days on water science, the HALO product line and selling water treatment, with a certification exam every day. It is not a TCEQ license course and does not replace one. For a licensed plumber, who is already exempt from the WTS license, it is the knowledge and the conversation. See the Dallas class.
Texas water varies a lot by city. Dallas reports 7.0 to 9.1 grains per gallon, which is hard. The Dallas water quality guide and hardness by city have the details from each utility's own report.
Questions
Texas Water Treatment Licensing Questions
Do I need a license to install a water softener in Texas?
If you install water treatment equipment under contract, TCEQ requires a Water Treatment Specialist license unless you are exempt. Individuals licensed as plumbers under Occupations Code Chapter 1301 are on TCEQ's exempt list.
Can a Texas plumber install a reverse osmosis system without a TCEQ license?
TCEQ's license page lists individuals licensed under Chapter 1301, the plumbing license law, as exempt from the Water Treatment Specialist license. The page does not split that exemption by equipment type. The RO limit on Class II applies to Water Treatment Specialist licensees.
Does a water treatment specialist need a plumbing license in Texas?
No. The plumbing license law says a plumbing license is not required for water treatment installations, exchanges, services or repairs, other than treating rainwater to supply a plumbing fixture or appliance. That work is subject to inspection and approval as provided by applicable state law or municipal ordinance.
How much does a Texas Water Treatment Specialist license cost?
TCEQ's application fee is $111, and testing centers may add their own fee. Class II and Class III also require TCEQ-approved coursework. TWQA's Basic Water Conditioning course is $150 for members and $300 for non-members at early registration.
How often does the Texas WTS license renew?
The license is valid for three years and requires 12 hours of continuing education to renew.
Is the HALO certification a Texas license?
No. The HALO Certified Water Quality Expert credential is a training certification issued by HALO Water Systems. It is not a TCEQ or plumbing board license and does not replace one.
Sources
Where These Facts Come From
Checked in September 2026. Rules and prices change, so confirm with the source before you rely on them.
- TCEQ Water Treatment Specialist license
- TCEQ occupational licensing training
- TCEQ computer-based testing
- TCEQ 30 TAC Chapter 30 amendments
- TSBPE Plumbing License Law (Occupations Code Chapter 1301)
- TSBPE endorsements
- TWQA training courses
- TWQA training rates
Written by Roger Wakefield, Texas Master Plumber
45 years in the trade and LEED AP. Published . More about Roger
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Texas plumbers already have the license
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