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Denver fire-line backflow testing

Denver Water treats fire-line services as part of the core program rather than an edge case.

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City: Denver Utility: Denver Water Cross-Connection Control and Backflow Prevention Program Cadence: Upon installation and annually thereafter Last verified: 2026-06-29
Local answer

What to check for Denver

Denver Water treats fire-line services as part of the core program rather than an edge case.

  • Due basis: Denver Water sends a testing reminder 30 days before the annual test is due, expects certified testers to report results to the Cross-Connection Control office, and can assess a $250 penalty after repeated ignored notices.
  • Who is affected: Commercial, industrial, domestic, irrigation, fire-line, and auxiliary-water-supply customers when Denver Water requires an approved assembly.
  • Program phone: 303-893-2444
Evidence-backed next step

Use the governing utility workflow

City search demand maps directly to Denver Water's governing program.

Open fire-line workflow
Local signals

Signals that matter before you act

  • All fire line services are required to have an approved assembly installed.
  • Fire-flow and construction-related utility work should be coordinated with Denver Water forms and standards.
  • Fire service can create larger and more expensive correction paths when the assembly is missing or overdue.
Workflow

Denver workflow order

  1. Confirm whether the service is domestic, irrigation, or fire-line.
  2. Install the approved fire-line assembly before the service is placed into use.
  3. Keep the annual test current so the service does not move into penalty or suspension status.