Longmont backflow prevention requirements
Start with the utility page to confirm who is affected, accepted submission methods, phone contact, and source evidence.
City backflow route
Longmont backflow testing routes through City of Longmont Backflow Prevention and Cross-Connection Control.
City search demand maps directly to Longmont's governing backflow program and enforcement workflow. This page keeps the city search term visible while routing the actual compliance work to the governing utility record.
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
Next action
Pick the Longmont backflow path that matches the problem
The city term helps discovery. The governing utility still decides the rule, submission method, tester route, and follow-up order.
Longmont annual backflow testing
Annually with utility due dates between April and September 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.
Longmont backflow reporting portal
Use the utility page to confirm whether reports go through BSI, WEIRS, SwiftComply, a city portal, or another official submission path.
Longmont failed backflow test
Use the failed-test page when the assembly has already failed and the next step is repair, retest, and report submission.
Longmont irrigation backflow testing
Use this path when the question is tied to sprinkler systems, reclaimed water, outdoor service, or irrigation assemblies.
Longmont fire-line backflow testing
Use this path when the assembly serves fire protection equipment or a managed commercial site.
Why Longmont maps to City of Longmont Backflow Prevention and Cross-Connection Control
City search demand maps directly to Longmont's governing backflow program and enforcement workflow.
- Longmont customers with backflow assemblies, especially non-single-family properties, irrigation services, and homes with higher-hazard conditions like fire suppression or boilers.
- Longmont adds a fee 31 days past due, warns of escalated civil enforcement at 61 days, and can assess civil penalties up to $500 per assembly with service interruption scheduled at 91 days past due.
- Program phone: 303-651-8416
- City route reviewed: 2026-04-05
Source-backed workflow
Longmont is one of the strongest Colorado pages because it publishes annual due-date ranges, a 45-day reminder, fee and penalty escalation, and a hard shift to SwiftComply for test submissions.
Support guides
Read these before acting on the Longmont workflow
How we verify local backflow rules
What counts as an official source, how local utility pages override generic assumptions, and how stale pages are re-verified.
Backflow reporting portals
How BSI, SwiftComply, and utility customer portals change the real testing workflow after the field work is done.
Anniversary date vs calendar deadline
Why some utilities track backflow tests by anniversary date, while others push owners into a calendar-season or hard-date deadline.
Residential vs commercial backflow rules
Why the local trigger is rarely just residential versus commercial, and how utilities actually split hazard, irrigation, multifamily, and managed-property cases.