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Backflow testing in St. Louis, MO

114 backflow testing businesses work within 25 miles of St. Louis, 46 of them based in town. Every one has testers on Missouri's certified backflow tester roster.

114 businesses within 25 miles
559 for-hire testers based in St. Louis

Certified backflow testers near St. Louis

Peters Eichler

100/100
✓ MO Certified Backflow Tester Verified #13-8326 ★ 4.1 (7 reviews) 6 certified testers Backflow Testing

3115 Sutton Blvd, St. Louis, MO 63143 · under 1 mile from St. Louis

Call (314) 647-4023 Details Website

Verified Oct 2026 · Unclaimed listing

Hoffman Brothers

100/100
✓ MO Certified Backflow Tester Verified #32-9608 ★ 4.9 (11981 reviews) 6 certified testers Backflow Testing

1025 Hanley Industrial Ct, Brentwood, MO 63144 · 2 mi from St. Louis

Call (314) 664-3011 Details Website

Verified Oct 2026 · Unclaimed listing

Linek Plumbing

100/100
✓ MO Certified Backflow Tester Verified #06-10548 ★ 4.7 (162 reviews) 14 certified testers Backflow Testing

24 Kirkham Industrial Ct, Webster Groves, MO 63119 · 2 mi from St. Louis

Call (314) 962-0956 Details Website

Verified Oct 2026 · Unclaimed listing

Maplewood Plumbing

100/100
✓ MO Certified Backflow Tester Verified #32-11793 ★ 4.8 (1815 reviews) 2 certified testers Backflow Testing

2725 Watson Rd, St. Louis, MO 63139 · 2 mi from St. Louis

Call (314) 645-6350 Details Website

Verified Oct 2026 · Unclaimed listing

GMP Plumbing

100/100
✓ MO Certified Backflow Tester Verified #32-12648 ★ 4.7 (16 reviews) 2 certified testers Backflow Testing

4950 Bischoff Ave, St. Louis, MO 63110 · 3 mi from St. Louis

Call (636) 464-2221 Details Website

Verified Oct 2026 · Unclaimed listing

L. Grasse & Assoc

100/100
✓ MO Certified Backflow Tester Verified #06-9606 ★ 4.3 (6 reviews) 6 certified testers Backflow Testing

1940 S Kingshighway Blvd, St. Louis, MO 63110 · 3 mi from St. Louis

Call (314) 771-3244 Details Website

Verified Oct 2026 · Unclaimed listing

RA Guinner Plumbing

100/100
✓ MO Certified Backflow Tester Verified #06-6814 ★ 4.8 (45 reviews) 3 certified testers Backflow Testing

7244 Gravois Ave, St. Louis, MO 63116 · 3 mi from St. Louis

Call (314) 752-9850 Details Website

Verified Oct 2026 · Unclaimed listing

Haberberger Mechanical

100/100
✓ MO Certified Backflow Tester Verified #06-8103 ★ 3.4 (29 reviews) 28 certified testers Backflow Testing

9744 Pauline Pl, St. Louis, MO 63123 · 4 mi from St. Louis

Call (314) 631-3324 Details Website

Verified Oct 2026 · Unclaimed listing

Rock Hill Mechanical

100/100
✓ MO Certified Backflow Tester Verified #13-10768 ★ 5 (6 reviews) 7 certified testers Backflow Testing

524 Clark Ave, Kirkwood, MO 63122 · 5 mi from St. Louis

Call (314) 966-0600 Details Website

Verified Oct 2026 · Unclaimed listing

Hydro Dynamics Corp.

100/100
✓ MO Certified Backflow Tester Verified #34-10436 ★ 4.5 (152 reviews) 12 certified testers Backflow Testing

9211 Olive Blvd, Olivette, MO 63132 · 5 mi from St. Louis

Call (314) 997-0064 Details Website

Verified Oct 2026 · Unclaimed listing

Lemay Plumbing, Inc.

100/100
✓ MO Certified Backflow Tester Verified #06-3403 ★ 4.3 (47 reviews) 2 certified testers Backflow Testing

945 Lemay Ferry Rd, St. Louis, MO 63125 · 5 mi from St. Louis

Call (314) 544-1066 Details Website

Verified Oct 2026 · Unclaimed listing

Hoffman Plumbing

100/100
✓ MO Certified Backflow Tester Verified #34-0090 ★ 4.2 (24 reviews) 2 certified testers Backflow Testing

2619 Salena St, St. Louis, MO 63118 · 6 mi from St. Louis

Call (314) 772-3559 Details Website

Verified Oct 2026 · Unclaimed listing

Murphy Co

100/100
✓ MO Certified Backflow Tester Verified #13-13424 ★ 4 (48 reviews) 66 certified testers Backflow Testing

1233 N Price Rd, St. Louis, MO 63132 · 6 mi from St. Louis

Call (314) 997-6600 Details Website

Verified Oct 2026 · Unclaimed listing

Bieg Plumbing

100/100
✓ MO Certified Backflow Tester Verified #06-11682 ★ 4.4 (293 reviews) 10 certified testers Backflow Testing

2015 Lemay Ferry Rd, St. Louis, MO 63125 · 6 mi from St. Louis

Call (314) 487-4564 Details Website

Verified Oct 2026 · Unclaimed listing

Emco Refrigeration

100/100
✓ MO Certified Backflow Tester Verified #13-1876 ★ 5 (3 reviews) 2 certified testers Backflow Testing

10200 Page Industrial Blvd, St. Louis, MO 63132 · 6 mi from St. Louis

Call (314) 427-7477 Details Website

Verified Oct 2026 · Unclaimed listing

Classic Aire Care

100/100
✓ MO Certified Backflow Tester Verified #32-12616 ★ 4.9 (5615 reviews) 2 certified testers Backflow Testing

1276 N Warson Rd, St. Louis, MO 63132 · 6 mi from St. Louis

Call (314) 352-1111 Details Website

Verified Oct 2026 · Unclaimed listing

Lawn Systems, Inc.

100/100
✓ MO Certified Backflow Tester Verified #34-10124 ★ 4.8 (255 reviews) 15 certified testers Backflow Testing

2260 Cassens Dr, Fenton, MO 63026 · 8 mi from St. Louis

Call (636) 349-6640 Details Website

Verified Oct 2026 · Unclaimed listing

Pro Outdoor

100/100
✓ MO Certified Backflow Tester Verified #34-13872 ★ 4.9 (814 reviews) 7 certified testers Backflow Testing

12852 Maurer Industrial Dr, Sappington, MO 63127 · 8 mi from St. Louis

Call (636) 692-4441 Details Website

Verified Oct 2026 · Unclaimed listing

Merlo Plumbing

100/100
✓ MO Certified Backflow Tester Verified #06-9970 ★ 3.6 (56 reviews) 20 certified testers Backflow Testing

11041 Gravois Industrial Ct, St. Louis, MO 63128 · 8 mi from St. Louis

Call (314) 843-1000 Details Website

Verified Oct 2026 · Unclaimed listing

The Waldinger Corp

100/100
✓ MO Certified Backflow Tester Verified #13-7292 9 certified testers Backflow Testing

2066 Fenton Logistics Pk Blvd, Fenton, MO 63026 · 8 mi from St. Louis

Call (314) 371-1000 Details Website

Verified Oct 2026 · Unclaimed listing

Mechanical Solutions

100/100
✓ MO Certified Backflow Tester Verified #13-8149 ★ 4 (5 reviews) 5 certified testers Backflow Testing

2030 Altom Ct, St. Louis, MO 63146 · 9 mi from St. Louis

Call (314) 342-1480 Details Website

Verified Oct 2026 · Unclaimed listing

Lawn Masters Inc

100/100
✓ MO Certified Backflow Tester Verified #34-8475 ★ 4.6 (212 reviews) 2 certified testers Backflow Testing

709 Glover Ave, Valley Park, MO 63088 · 9 mi from St. Louis

Call (636) 230-0700 Details Website

Verified Oct 2026 · Unclaimed listing

Missouri American Water: backflow test rules

  • Who must test. From the January 2015 Cross Connection Control Program regulations. Source.
  • Notices and deadlines. A mailed test notice carries the Customer Confirmation Number (CCN) the tester needs to file. Source.
  • How the report is filed. Since Sept 1, 2023 reports go to BSI (Backflow Solutions, Inc.) at www.bsionline.com; BSI support 888-966-6050 or support@backflow.com. The tester needs the customer's CCN. Source.
  • Tester registration. Testers must hold a BSI login to enter reports. Source.
  • Approved testers. Customers can use the Missouri DNR list or BSI's Find a Testing Company lookup (requires the CCN from the notice). Source.

Everything about Missouri American Water's backflow program

Independent certified testers based in St. Louis

Testers Missouri's roster lists without a company. Names, certificate numbers and phones as the state publishes them.

TownTesterCertificateExpiresPhone
St. Louis Ahmed A. Kapetanovic 32-8098 Apr 2029 (314) 376-9168

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 in St. Louis and we'll text you a month before it is due, with certified local testers ready to book.

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Backflow testing questions in St. Louis

Who can test a backflow preventer in St. Louis?

A tester certified by Missouri Department of Natural Resources. Your water utility may also keep its own list of testers allowed to file reports. In St. Louis, see Missouri American Water's rules below.

How many certified backflow testers are based in St. Louis?

559 testers who test for the public list St. Louis as their base on Missouri's roster, and 114 testing businesses are within 25 miles.

How often do I need a backflow test?

Most utilities require a test when the assembly is installed and then every year. Your utility's notice gives the due date and how the tester files the report.

Roster: Missouri Department of Natural Resources, read October 6, 2026.

Approved list: WaterOne approved backflow testers, WaterOne.

Approved list: City of Nixa certified backflow testers, City of Nixa.

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