Houston
Launch city for the Houston market. Every business below is copied from the City of Houston Public Works Cross Connection Control Program backflow tester company list.
330 backflow testers from the public list
Launch state
Texas
Houston and Irving / DFW are the Texas launch markets. Rosters come from each city's own approved-tester list.
Irving / DFW
Launch market for Irving and the broader Dallas–Fort Worth area. The roster itself is only the City of Irving approved backflow tester list, not a combined DFW directory.
265 backflow testers from the public list