BackflowNear Test-Due Reminder

Backflow testing companies in Montana

From City of Billings Public Works's list of companies approved to test backflow assemblies in its water system, read August 5, 2026. Montana publishes no statewide tester list we can use, so we start with its largest utility lists.

13 companies on the utility list
7 listed here, phones checked on Google

The lists we use in Montana

Being on a utility's list means that utility lets the company file backflow test reports in its system. It is not a state license. See Montana backflow rules.

Backflow testing businesses in Montana

Ranked by our quality score: on the utility's current list, a phone that matches the business's Google profile, and a website. Nobody can pay to move up.

What the badges mean
✓ MT Utility-Approved Tester Verified On the city list
The company is on a water utility's own approved list (the second badge names the list). That is the utility's approval, not a state license, and it counts for that utility.
3 certified testers
How many certified testers the roster lists at this business.
★ 4.8 (25 reviews)
The Google rating, shown as Google reports it. It does not change the order.

Order is by our quality score, never by payment. How we verify listings.

G&T Plumbing

100/100
✓ MT Utility-Approved Tester Verified ★ 4.8 (78 reviews) 2 certified testersOn City of Billings list Backflow Testing

1402 Central Ave, Billings, MT 59102

Call (406) 256-6016 Details Website
Verified Oct 2026 · Unclaimed listing

Star Service Plumbing

90/100
✓ MT Utility-Approved Tester Verified ★ 4.9 (60 reviews) 4 certified testersOn City of Billings list Backflow Testing

26 S 24th St, Billings, MT 59101

Call (406) 259-3754 Details
Verified Oct 2026 · Unclaimed listing

Hertz Plumbing

90/100
✓ MT Utility-Approved Tester Verified ★ 3 (8 reviews) 2 certified testersOn City of Billings list Backflow Testing

3701 South 56th St W, Billings, MT 59101

Call (406) 248-3106 Details
Verified Oct 2026 · Unclaimed listing

Towns with approved testing companies

Every listed backflow testing company, A to Z

Questions

Where do these Montana backflow testing companies come from?

Montana publishes no statewide list of backflow testers that we can use, so every business here is on the approved list of City of Billings Public Works: companies allowed to file backflow test reports in that water system. We read the list on August 5, 2026 and checked each company's phone against its Google profile.

Who is allowed to test a backflow preventer in Montana?

A tester certified as Montana's rules require, and usually one your water utility accepts. Our Montana rules guide links the state rule. Ask any company for the tester's certificate number before the test.

How often does a backflow assembly need testing?

Most water utilities require testable backflow assemblies to be tested at installation and then every year. Your utility's notice gives your deadline and how the report is filed.

Never miss your annual backflow test

Most water utilities require the backflow assembly on an irrigation, fire or commercial line to be tested every year, and a missed test can mean a shutoff notice. Tell us when yours was last tested and we'll text you a month before it is due, with certified local testers ready to book.

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