Lafayette's irrigation backflow tests are due May 31. Domestic and fire assemblies are due Aug. 31.
Lafayette backflow rules at a glance
| Water provider | City of Lafayette, Backflow Prevention and Cross-Connection Control (BSI Online administers the program) |
|---|---|
| Who | Non-single-family residential and commercial accounts. The water account holder is responsible for testing. |
| Deadlines | Irrigation assemblies by May 31. Domestic containment and fire assemblies by Aug. 31. |
| How reports are filed | BSI Online only, by testers registered with BSI |
| Failed tests | Email the city within 24 hours; repair or replace and retest within 5 days |
| If you ignore it | Water service is shut off, and a $250 fee per untested assembly goes on the utility bill |
| Program contact | backflow@lafayetteco.gov · 303-665-5588 |
Summarized from City of Lafayette's published program information (source), checked October 2026. The notice from your water provider always has the final word on your due date.
Two deadlines, not one
Irrigation assemblies are due first, by May 31, so sprinkler systems need to be on and running in time for the test. Domestic and fire assemblies are due by Aug. 31. Booking both in spring leaves room for a repair and retest before either date.
Five days to fix a failure
Lafayette gives only 5 days to repair or replace a failed assembly and retest it. We'll tell you on the spot what failed and quote the repair before any work starts. Fire sprinkler assemblies need a tester with the state's fire suppression backflow registration.
What we do on a Lafayette 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 Lafayette 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
Denver · Aurora · Thornton · Westminster · Arvada · Northglenn · Broomfield · Golden · Lakewood · Englewood · Commerce City · Wheat Ridge · Parker · Boulder · Louisville · Greenwood Village · Centennial · Commercial & HOA testing · For plumbing & irrigation companies · Every provider's rules
More in Lafayette: all plumbing services in Lafayette