GMP Plumbing, St. Louis, MO: Backflow Testing

Certification

✓ On Missouri's certified backflow tester roster Phone matches its Google profile

Certified tester	Certificate	Expires
Stephen Hamilton	32-12648	May 2027
Gregory Huffman	32-12649	May 2027

From the Missouri Department of Natural Resources roster, read October 6, 2026. The roster lists people, not companies; these are the certified testers it lists for this business. Ask which tester will do your test, and your utility may also require the tester to be registered with it.

Call (636) 464-2221 Visit website More testers in Missouri

Where you will find GMP Plumbing

These are the city pages close enough for this business to appear on.

Other backflow testers nearby

Business	Services	Distance
American Boiler & Mechanical	Backflow Testing	under 1 mi
L. Grasse & Assoc	Backflow Testing	under 1 mi
StL Direct Mechanical	Backflow Testing	under 1 mi
Kaemmerlen Facility Solutions	Backflow Testing	under 1 mi
CNJ Mechanical	Backflow Testing	under 1 mi
Hoffmann Brothers	Backflow Testing	under 1 mi

Questions about GMP Plumbing

Is GMP Plumbing licensed?

Yes. Missouri records showed an active certificate (#32-12648) when we last checked in Oct 2026. Ask to see it before work starts, since a certificate can lapse between checks.

What does GMP Plumbing do?

Their listing covers backflow testing. Call to confirm the service you need, because offerings change.

What areas does GMP Plumbing serve?

They are based in St. Louis, Missouri, within driving distance of St. Louis, Webster Groves, Olivette, Kirkwood, Fenton. Service areas are set by the business, so confirm yours when you call.

How do I reach GMP Plumbing?

Call (636) 464-2221. Their website is linked on this page.

Is this your business?

Claim this listing free: add the utilities you file with, your service area and your residential test price, and get annual test-due requests from property owners.

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