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Thornton fire-line backflow testing

Thornton is less explicit than Avondale on fire-line assembly classes, but the same annual testing and approved device rules still govern protected services.

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City: Thornton Utility: City of Thornton Cross Connections and Backflow Prevention Cadence: At installation and at least annually after that Last verified: 2026-06-29
Local answer

What to check for Thornton

Thornton is less explicit than Avondale on fire-line assembly classes, but the same annual testing and approved device rules still govern protected services.

  • Due basis: Thornton says commercial, industrial, and non-single-family residences must have approved devices installed and tested annually. Test results must be submitted online to Backflow Solutions before the annual due date.
  • Who is affected: Thornton commercial, industrial, irrigation, and non-single-family properties plus any service where the city identifies a cross-connection risk.
  • Program phone: 720-977-6586
Local signals

Signals that matter before you act

  • Approved devices are required under city ordinance.
  • Annual testing applies to necessary backflow assemblies after installation.
  • Portal submission is still the acceptance path.
Workflow

Thornton workflow order

  1. Confirm the protected service connection class.
  2. Use a certified tester with the right assembly experience.
  3. Submit the annual result through Thornton's reporting workflow.