BackflowNear Test-Due Reminder

Backflow testing companies in Michigan

From the approved tester lists of Oakland County Water Resources Commissioner and City of Ann Arbor Public Works, newest read April 30, 2026. Michigan publishes no statewide tester list we can use, so we start with its largest utility lists.

74 companies on the utility list
43 listed here, phones checked on Google

The lists we use in Michigan

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 Michigan backflow rules.

Backflow testing businesses in Michigan

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
✓ MI 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.

Thornton & Grooms

90/100
✓ MI Utility-Approved Tester Verified ★ 4.9 (16204 reviews) On Oakland County WRC list Backflow Testing

24565 Hallwood Ct, Farmington Hills, MI 48335

Call (248) 644-7810 Details Website
Verified Oct 2026 · Unclaimed listing

Haley Mechanical

90/100
✓ MI Utility-Approved Tester Verified ★ 4.9 (5556 reviews) On City of Ann Arbor list Backflow Testing

8415 Dexter-Chelsea Rd, Dexter, MI 48130

Call (734) 424-9170 Details Website
Verified Oct 2026 · Unclaimed listing

Waterwork LLC

90/100
✓ MI Utility-Approved Tester Verified ★ 4.7 (2327 reviews) On Oakland County WRC list Backflow Testing

1049 Hilton Rd, Ferndale, MI 48220

Call (248) 542-8022 Details Website
Verified Oct 2026 · Unclaimed listing

NES Plumbing

90/100
✓ MI Utility-Approved Tester Verified ★ 4.8 (380 reviews) On Oakland County WRC list Backflow Testing

78 N Washington St, Oxford, MI 48371

Call (248) 800-4144 Details Website
Verified Oct 2026 · Unclaimed listing

Rolls Mechanical

90/100
✓ MI Utility-Approved Tester Verified ★ 4.9 (233 reviews) On Oakland County WRC listOn City of Ann Arbor list Backflow Testing

1490 Torrey Rd D, Fenton, MI 48430

Call (810) 629-7752 Details Website
Verified Oct 2026 · Unclaimed listing

Towns with approved testing companies

All 43 backflow testing businesses in Michigan, by town

Ann Arbor: AI Walk Plumbing, Altech Mechanical Service, Associated Plumbing & Sewer, Boone & Darr, Inc., Hutzel Plumbing & Heating, Olde Towne Plumbing Co.

Birch Run: American Plumbing and Heating Inc.

Dexter: Haley Mechanical

Farmington: Danboise Mechanical Electrical Inc

Farmington Hills: A-1 Comfort Control LLC, H Muskovitz Plumbing Company, Thornton & Grooms

Fenton: Rolls Mechanical

Ferndale: Cregger Plumbing, Heating, & Cooling, Waterwork LLC

Hazel Park: Able Plumbing

Howell: PTS Plumbing

Livonia: Clearwater Construction Services, Guardian Plumbing and Heating INC, Lighthouse Plumbing Services, Inc, Rooter MD plumbing LLC

Madison Heights: American Backflow Certification & Repair, Inc

Manchester: George F. Wilbur, Inc.

New Baltimore: LPS Plumbing Co Inc

Novi: Servicepro Plumbing Electrical Mechanical

Oxford: All Building Services LLC, Delong Plumbing, Express Plumbing, Heating & Mechanical, NES Plumbing

Pontiac: Lee Industrial Contracting

Rochester Hills: Huron Plumbing, Inc, Putman & Sons Plumbing, Rochester Plumbing & Heating, Inc

Royal Oak: Nelson Brothers Plumbing

Shelby Township: Shelby Mechanical LLC

South Lyon: A & R Plumbing

Southfield: Royal Plumbing

Sterling Heights: Macomb Mechanical, Inc.

Troy: Big Beaver Plumbing & Backflow, LLC, Paul C Scott and Sons Plumbing, Inc.

Waterford Township: Evelux Plumbing

Whitmore Lake: Master Craft Plumbing, Inc.

Ypsilanti: Ken Cook's Plumbing & Heating

Every listed backflow testing company, A to Z

Water utility backflow programs in Michigan

Your utility sets your deadline, the testers it accepts and how the report is filed. Each page quotes the utility's own rules.

Questions

Where do these Michigan backflow testing companies come from?

Michigan publishes no statewide list of backflow testers that we can use, so every business here is on the approved list of Oakland County Water Resources Commissioner and City of Ann Arbor Public Works: companies allowed to file backflow test reports in that water system. We read the list on April 30, 2026 and checked each company's phone against its Google profile.

Who is allowed to test a backflow preventer in Michigan?

A tester certified as Michigan's rules require, and usually one your water utility accepts. Our Michigan 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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