If your commercial building in Boulder has a fire sprinkler system, the backflow assembly on that fire line answers to the City of Boulder, not Denver Water. It’s a separate program with its own portal, its own notification process, and its own penalty structure. Property managers who assume the rules are the same as Denver’s end up missing a step, and that step is usually the one that triggers a fine. Backflow testing is also just one piece of the annual compliance calendar; it runs alongside your regular NFPA 25 inspections and testing.
Boulder Runs Its Own Backflow Program
The City of Boulder’s Backflow Prevention program requires an approved backflow assembly on every commercial, industrial, fire, irrigation, and multi-unit residential water line. Multi-unit properties with nine or more units are always included. If your building has three to eight units, you may qualify for an exemption, but fire and irrigation lines are covered regardless of unit count.
Three assembly types show up most often on Boulder commercial properties:
- RPZ (Reduced Pressure Zone): the highest level of protection, required where a fire system carries antifreeze or other additives. Needs a floor drain and has to sit at least 12 inches above grade.
- Double Check (DC): used for lower-hazard fire and domestic lines, and can sometimes be installed below grade.
- Pressure Vacuum Breaker (PVB): for irrigation only, mounted 12 inches above the highest sprinkler head on the property.
A fire line on a dedicated meter needs its own backflow assembly and its own annual test, separate from the domestic water line.
The Testing and Submission Process
Testing has to happen every year, done by a certified tester holding current ABPA or ASSE certification. Boulder wants advance notice before the test, since your fire line goes offline for the duration. After the test, results go through Boulder’s online backflow portal, and the city states reports are due within 10 days of the test date.
If an assembly fails, you get 30 days to repair and retest, or you need to submit a compliance plan to the city. Miss the window entirely and Boulder escalates: a warning hangtag carries a $59 fee, a water shutoff adds a $113 fee, and additional penalties can run $250 to $1,500 depending on how long the property stays out of compliance.
Questions about a specific assembly or portal login go to the city directly at [email protected] or 303-413-7401. Boulder doesn’t maintain a list of approved testers, so it’s on the property manager or the contractor to confirm certification before scheduling.
Where Property Managers Get Tripped Up
A few patterns come up again and again on Boulder properties:
- Assuming the domestic line test covers the fire line. It doesn’t. If your building has both, you need two separate assemblies tested and two separate reports submitted.
- Not confirming fire suppression certification. Colorado requires a Fire Suppression System Contractor - Backflow certification to test and repair assemblies on fire lines, on top of the standard ABPA or ASSE credential. A general backflow tester without that credential can test your irrigation line, not your fire line.
- Losing track of last year’s report. If you inherited a property or changed management companies mid-year, check with Boulder directly rather than assuming the prior manager filed on time.
What This Means for Your Building
If you manage a commercial property in Boulder, find your fire line’s backflow assembly now and confirm when it was last tested. The assembly is usually in the mechanical room where the fire line enters the building, or in an exterior vault, and it looks like a brass fitting with test cocks and, on an RPZ, a relief valve in the middle. If you can’t find a report from the last 12 months, assume it’s due and get it scheduled before the city sends a hangtag.
Elevation Fire Protection tests, repairs, and reports backflow assemblies on fire sprinkler systems across Boulder, Denver, Aurora, Fort Collins, and Cheyenne, and our technicians carry the fire suppression backflow certification Boulder and the state require. If you’re not sure your assembly is current, we’re glad to check. Visit our backflow testing page, see how we serve the Boulder area, or call (720) 382-9669.