Lewisville customers on city water keep a testable backflow assembly on the irrigation line. The test is its own visit. It is not folded into a head repair, and this page does not invent an ordinance section number. The city utility tells you which test form they want. Ask them, and bring that answer to the appointment.
What you get
The assembly is tested and the result is written up for you. If it fails, the repair is quoted before parts are changed. A failed check valve and a leaking shutoff are different jobs. Heads and zones can be looked at the same day if you ask, as separate work.
The city’s watering-enforcement line is the city’s. Use (940) 239-0007 to book the test. Have the assembly location ready: side yard, front corner, or a cage that has been buried in shrub growth since the last test.