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Longmont annual backflow testing

Longmont requires annual testing by certified testers and publishes an enforcement ladder starting 45 days before the due date and ending with civil penalties and possible water suspension.

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City: Longmont Utility: City of Longmont Backflow Prevention and Cross-Connection Control Cadence: Annually with utility due dates between April and September Last verified: 2026-06-29
Local answer

What to check for Longmont

Longmont requires annual testing by certified testers and publishes an enforcement ladder starting 45 days before the due date and ending with civil penalties and possible water suspension.

  • Due basis: Longmont requires annual testing by certified testers, says new and replacement assemblies must be tested after installation, and publishes a notice-and-enforcement sequence that starts 45 days before the due date and can escalate to civil penalties and water suspension.
  • Who is affected: Longmont customers with backflow assemblies, especially non-single-family properties, irrigation services, and homes with higher-hazard conditions like fire suppression or boilers.
  • Program phone: 303-651-8416
Local signals

Signals that matter before you act

  • 45-day reminders go out before the due date.
  • 31 days past due triggers a fee and city-contracted outreach.
  • 91 days past due can trigger up to $500 per assembly and service interruption.
Workflow

Longmont workflow order

  1. Check the annual Longmont due date for the property.
  2. Use a certified tester and submit on time.
  3. If the schedule slips, resolve it before the fee and penalty ladder escalates.