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Backflow and RPZ testing

Backflow Preventer and RPZ Testing in the Twin Cities

Northland Mechanical tests, certifies, repairs and replaces backflow preventers and reduced pressure zone (RPZ) assemblies for commercial buildings across the Minneapolis-St. Paul metro. Most water utilities require these devices to be tested every year by a certified tester; we perform the test, file the report, and fix or replace any device that fails.

Need this today? Call and an on-call technician is assigned after a few quick questions. Available 24/7, 365 days a year.

763-544-5100

What this service covers

Annual backflow preventer testing and certification
RPZ assembly testing, certification and repair
Rebuild kits and replacement assemblies
Test report filing with the water utility
Reminders when your next test is due

When to call

A notice from your city or water utility that a test is due
Water discharging from the RPZ relief valve
A device that failed its last test
A new irrigation, boiler feed or fire line connection that needs a device installed

How a service call works

Call 763-544-5100 or send a message with the building address and what is going on.
A technician is assigned. Emergencies are dispatched around the clock; everything else is scheduled at a time that works for the building.
Diagnosis and a clear scope. You get a plain explanation and a price before repair work beyond the diagnosis begins.
The work, and the paperwork. Service history is kept for your building so the next call, or a maintenance program, starts from what we already know.

Frequently asked questions

How often does a backflow preventer need to be tested?

Most Minnesota water utilities require testing once a year by a certified tester, and any time the device is repaired or relocated. Your utility's notice states the deadline; we can put your devices on an annual schedule so it is never missed.

What happens if the device fails the test?

We tell you on the spot. Many failures are fixed with a rebuild kit during the same visit; devices that cannot be repaired are replaced. A passing retest is documented and filed.

Do you file the test report?

Yes. We complete the utility's test form and submit it, and give you a copy for your records.

Service area

We serve commercial and industrial buildings throughout the Minneapolis-St. Paul metro from our shop in New Hope, including Minneapolis, Saint Paul, New Hope, Plymouth, Golden Valley, Brooklyn Park, Maple Grove, Bloomington, Eden Prairie, Minnetonka, Crystal, Robbinsdale, St. Louis Park, Edina, Roseville, Burnsville, Eagan and Woodbury. If your building is in the metro and you are not sure, call and ask.

Request service or a quote Tell us about the building. We reply within one business day, or call for anything urgent.

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Page reviewed 2026-09-18. Northland Mechanical Contractors, Inc., New Hope, Minnesota, serving the Twin Cities since 1971.