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Lewisville annual backflow testing

Lewisville publishes one of the cleanest annual-testing workflows in the pilot set: test at installation and at least once per year thereafter, then submit electronically through BSI within ten days.

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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
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What to check for Lewisville

Lewisville publishes one of the cleanest annual-testing workflows in the pilot set: test at installation and at least once per year thereafter, then submit electronically through BSI within ten days.

  • 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

  • At least annual after installation is the baseline rule.
  • BSI submission must happen within ten days of the test date.
  • Lewisville also adds a $25 filing fee per test submission.
Workflow

Lewisville workflow order

  1. Confirm the property falls into a category where Lewisville requires an assembly.
  2. Use a Texas-licensed tester who is currently registered with the City of Lewisville.
  3. Submit the completed report through BSI Online within ten days.
  4. If the tester cannot legally handle the device type, switch before the deadline slips.