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Lewisville fire-line backflow testing

Lewisville's tester page and code language make fire assemblies a separate operational concern because not every tester can legally test every fire device.

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City: Lewisville Utility: City of Lewisville Backflow Testing Cadence: At installation and at least once per year thereafter Last verified: 2026-06-29
Local answer

What to check for Lewisville

Lewisville's tester page and code language make fire assemblies a separate operational concern because not every tester can legally test every fire device.

  • Due basis: Lewisville says backflow prevention assemblies must be tested at installation and at least once per year thereafter by a licensed tester registered with the City. Test reports must be submitted electronically through BSI Online within ten days of the test date.
  • Who is affected: Irrigation, fire sprinkler, commercial, industrial, multi-family, and other properties the City deems a cross-connection hazard.
  • Program phone: 972-219-3400
Local signals

Signals that matter before you act

  • Fire sprinkler systems are explicitly named on the official page.
  • Lewisville warns that testers need the right credentials for the assembly being tested.
  • Fire assembly delays can be more expensive because the enforcement language is stronger and the device type is more specialized.
Workflow

Lewisville workflow order

  1. Confirm the assembly is part of the fire protection side of the property.
  2. Verify the chosen tester is licensed for the fire assembly type, not just general backflow work.
  3. Submit through the same Lewisville BSI workflow before the ten-day deadline.