So the truth is there are lots and lots of good, honest, competent plumbers in Dallas who will get the job done and not take you to the cleaners. But then there's the other kind. So at least you can use Eric Chapman as a benchmark for what to look for. Chapman advertises that he is a "licensed master plumber." Is he? Google "Texas licensing system," and you will get to a page that lets you make a "public license search by name." He's there, fully accredited as a master plumber. His ad also tells you that he's insured — another good thing — and that he gives free estimates and doesn't charge travel time. You can talk to his company ahead of time on the phone, and they will tell you exactly how the charges will work. On top of all that, he's a great plumber and has good plumbers working for him.