For installation or maintenance on an irrigation system, you should use a professional irrigator licensed by the state environmental agency, the Texas Commission on Environmental Quality (TCEQ). The license means they have gone through specialized training to do their work, including periodic continuing education, and have been checked for criminal records by the state.
Homeowners may also install and maintain systems if they are doing the work at a property that is their residence. You can find irrigators in telephone listings. You may confirm their licensing online through records maintained by the Texas Commission on Environmental Quality, or TCEQ.
To find an irrigator’s license records use this link: TCEQ Search Licensing or Registration Information (texas.gov)