Will you go after my customers for other work?

No. We test, tag, and file the report, and the customer stays yours. If an assembly fails, you get the results and decide who quotes the repair.

Do you pay referral bonuses?

Yes. Singer Plumbing Co. pays a referral bonus for every customer a plumbing or irrigation company recommends. Call or text (720) 818-5569 for the current terms.

Who files the backflow test report?

We do, the way the property's water provider requires, and you get a copy. Each provider files differently, from email to Denver Water to online portals and BSI Online.

Do you need a plumbing license to test backflow preventers in Colorado?

No. Colorado's 2025 backflow law (HB25-1077) exempts inspecting, testing, and repairing backflow devices from plumbing licensure. Installing or removing an assembly still requires a licensed plumber.

What do you charge contractors?

Contractor rates depend on volume. Call or text (720) 818-5569 to talk rates.

Subcontract Backflow Testing for Plumbers, Denver

No certified backflow tester on your crew? Send us the tests. We test, tag, and turn in the reports, and your customers stay your customers.

Referral bonusWe pay a referral bonus for every customer you recommend to us. Call or text (720) 818-5569 to talk rates.

How it works

Send the address, the assembly type and size if you know them, and the due date, or forward the notice from the water provider
We schedule the test anywhere from Centennial to Boulder
Every check valve and relief valve is tested with a differential pressure gauge calibrated October 2026 and traceable to NIST
The assembly is tagged with the service date, our business information, and the tester's certification number, as Colorado requires
The report is filed the way that property's water provider requires, and you get a copy

Your customers stay yours

We're not after your customers' other work. We do the test and the paperwork, and the relationship stays with you. If an assembly fails, you get the results and decide who quotes the repair. If you'd rather we handle it, we can rebuild it and retest the same visit. Replacing an assembly is installation work, which in Colorado needs a licensed plumber.

Why sub out backflow tests

No tech to certify, and no test kit to buy and keep calibrated
Every water provider files differently: email to Denver Water, online portals in cities like Aurora, Boulder, Arvada, and Parker, and BSI Online in cities like Thornton, Westminster, and Broomfield
Since July 2025, Colorado requires a tag on every device that's tested or repaired, with the tester's certification number on it
Testing and repairing backflow devices doesn't require a plumbing license in Colorado; installing or removing one still does. The rules by provider →

What we test

PVB and SVB vacuum breakers on residential and commercial irrigation
DCVA / DC double check valve assemblies
RPZ / RP reduced pressure assemblies on domestic, irrigation, and process lines

Fire sprinkler backflow assemblies need a separate state fire suppression registration. We test domestic, irrigation, and process assemblies.

Credentials and paperwork

Gabriel Singer, ABPA-certified backflow tester: ABPA certification #06-2610861, current through October 2029
Test gauge calibrated October 2026, traceable to NIST
Insured; certificate of insurance and W-9 on request

Managing properties instead? See commercial and HOA backflow testing.