Northglenn wants reports within 10 days of the test, and it generally requires RPZ assemblies, even on irrigation.
Northglenn backflow rules at a glance
| Water provider | City of Northglenn, Cross-Connection Control Program (Municipal Code Article 16-27) |
|---|---|
| Who | Commercial, industrial, and multi-family properties, including townhomes and apartments |
| Assembly type | Reduced pressure zone (RPZ) assemblies are generally required, including on irrigation lines, with some exceptions |
| How often | At installation and at least once a year |
| Who can test | An ABPA- or ASSE-certified tester; the report must show the certification type, number, and expiration |
| Deadlines | Passing reports within 10 days of the test. Failed test: notify the city the same day and file the report within 10 days; repair and retest, or replace, within 30 days. |
| Records | Owners keep test reports for at least three years |
| How reports are filed | Through BSI Online, per the city's backflow program page |
| Program contact | 303-450-4026, backflow@northglenn.org |
Summarized from City of Northglenn's published program information (source), checked October 2026. The notice from your water provider always has the final word on your due date.
Why RPZs matter here
An RPZ has a relief valve that dumps water if something goes wrong, which makes it the right device for higher-hazard connections, and it needs more checks during a test than a PVB. It's also more expensive to neglect: a relief valve that starts discharging means a fouled check or a worn seat. How RPZs, DCVAs, and PVBs differ →
What we do on a Northglenn backflow test
- Confirm the assembly type, size, and serial number against your provider's records
- Test every check valve and relief valve with a differential pressure gauge calibrated October 2026 and traceable to NIST
- Tag the assembly with the service date, our business information, and the tester's certification number
- File the completed report the way City of Northglenn requires
- Send you a copy of the report, with photos
If the assembly fails
Most failures come down to a dirty or worn check valve, a tired relief valve, or a split rubber part. Those get cleaned or rebuilt and retested, usually in the same visit, after you approve the price. If the body itself is cracked, usually from a missed winterization, the assembly has to be replaced. Replacing an assembly is installation work, which in Colorado needs a licensed plumber; we'll tell you exactly what's needed and do the retest once it's in.
Before we come out
- Have the notice from your water provider handy, or send a photo of it when you book
- Tell us where the assembly is, and leave any gate unlocked or the mechanical room open
- For sprinkler assemblies, the water needs to be on. If the system is still winterized, we can do the spring startup and the test in one visit.
Not sure what kind of assembly you have? PVB vs. DCVA vs. RPZ →
Backflow testing nearby
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