Here is a helpful tip from KHOU – http://www.khou.com/weather/harvey-help/do-your-homework-before-hiring-a-contractor/477243076

If you have plumbing needs, the Texas State Board of Plumbing Examiners is where you need to do the homework.  Keep in mind while searching for the contractor there are different levels of licensed plumbers.  ONLY a Responsible Master Plumber (RMP) can be insured in the state of Texas.  All other licensed plumbers must work for or under a RMP would be working for on the side without being fully insured.

To search for a licensed plumber on the Texas State Board of Plumbing Examiners you can use this link – https://vo.licensing.hpc.texas.gov/datamart/selSearchType.do