Here is a list of testers that are registered with the Town of Addison. If you decide to use a different tester, they must come in and register with Addison first. It could be very beneficial to go ahead and test, for example the 4” domestic and 2” RPZ, and any other assembly that they find now, in case of making you aware of assemblies needing to be repaired or overall replacement. Remember we are here to help, please feel free to call. Robert Trevino Water Quality Specialist Town of Addison 972-450-2827