BackflowNear Test-Due Reminder

Backflow testing in Lake St Louis, MO

89 backflow testing businesses work within 25 miles of Lake St Louis, 5 of them based in town. Every one has testers on Missouri's certified backflow tester roster.

89 businesses within 25 miles

Certified backflow testers near Lake St Louis

Pro Outdoor

100/100
✓ MO Certified Backflow Tester Verified #34-12921 ★ 4.7 (756 reviews) 18 certified testers Backflow Testing

304 TCW Ct, Lake St Louis, MO 63367 · under 1 mile from Lake St Louis

Call (636) 695-7800 Details Website

Verified Oct 2026 · Unclaimed listing

Lawn Authority

100/100
✓ MO Certified Backflow Tester Verified #34-10719 ★ 4.8 (104 reviews) 2 certified testers Backflow Testing

2709 Hopewell Rd, Wentzville, MO 63385 · 1 mi from Lake St Louis

Call (636) 928-5296 Details Website

Verified Oct 2026 · Unclaimed listing

Best Lawn Care

100/100
✓ MO Certified Backflow Tester Verified #34-11683 ★ 4.9 (979 reviews) 3 certified testers Backflow Testing

209 Josephville Rd, Wentzville, MO 63385 · 4 mi from Lake St Louis

Call (636) 200-3000 Details Website

Verified Oct 2026 · Unclaimed listing

Pipe Guys

90/100
✓ MO Certified Backflow Tester Verified #32-13204 ★ 5 (20 reviews) Backflow Testing

1072 Wies Industrial Dr, Lake St Louis, MO 63367 · under 1 mile from Lake St Louis

Call (314) 930-6009 Details Website

Verified Oct 2026 · Unclaimed listing

Superior Service

90/100
✓ MO Certified Backflow Tester Verified #36-12691 ★ 4.9 (2605 reviews) Backflow Testing

101 Stag Industrial Blvd, Lake St Louis, MO 63367 · under 1 mile from Lake St Louis

Call (314) 209-7500 Details Website

Verified Oct 2026 · Unclaimed listing

Roden Landscaping

90/100
✓ MO Certified Backflow Tester Verified #34-8418 ★ 4.6 (7 reviews) 2 certified testers Backflow Testing

7800 State Rte N, O'Fallon, MO 63368 · 2 mi from Lake St Louis

Call (636) 561-3947 Details Website

Verified Oct 2026 · Unclaimed listing

Automatic Rain

90/100
✓ MO Certified Backflow Tester Verified #34-12533 ★ 4.3 (23 reviews) 2 certified testers Backflow Testing

1491 E Pearce Blvd, Wentzville, MO 63385 · 4 mi from Lake St Louis

Call (314) 387-0069 Details Website

Verified Oct 2026 · Unclaimed listing

MH Contracting

90/100
✓ MO Certified Backflow Tester Verified #32-8101 ★ 4.6 (25 reviews) Backflow Testing

2256 Autumn Trace Pkwy, Wentzville, MO 63385 · 7 mi from Lake St Louis

Call (314) 960-3008 Details Website

Verified Oct 2026 · Unclaimed listing

Wayne's Plumbing

80/100
✓ MO Certified Backflow Tester Verified #06-8594 Backflow Testing

75 Saybridge Manor Pkwy, Lake St Louis, MO 63367 · 1 mi from Lake St Louis

Call (636) 561-1499 Details

Verified Oct 2026 · Unclaimed listing

3 Seasons Irrigation

80/100
✓ MO Certified Backflow Tester Verified #34-12361 ★ 4.6 (16 reviews) Backflow Testing

1419 Diehr Road, Wentzville, MO 63385 · 1 mi from Lake St Louis

Call (636) 262-8026 Details

Verified Oct 2026 · Unclaimed listing

Henrys Irrigation

80/100
✓ MO Certified Backflow Tester Verified #32-2826 ★ 5 (11 reviews) 2 certified testers Backflow Testing

110 River Grv Ct, O'Fallon, MO 63366 · 9 mi from Lake St Louis

Call (636) 466-5324 Details

Verified Oct 2026 · Unclaimed listing

Harvestowne Irrigation

100/100
✓ MO Certified Backflow Tester Verified #34-9317 ★ 4 (26 reviews) 14 certified testers Backflow Testing

326 Depot St, St Peters, MO 63376 · 10 mi from Lake St Louis

Call (636) 970-0208 Details Website

Verified Oct 2026 · Unclaimed listing

Chesterfield Irrigation

100/100
✓ MO Certified Backflow Tester Verified #34-10712 ★ 3.5 (33 reviews) 4 certified testers Backflow Testing

727 Spirit of Saint Louis Blvd, Chesterfield, MO 63005 · 11 mi from Lake St Louis

Call (636) 537-9795 Details Website

Verified Oct 2026 · Unclaimed listing

Metro Lawn Sprinklers

100/100
✓ MO Certified Backflow Tester Verified #34-9140 ★ 4.9 (851 reviews) 17 certified testers Backflow Testing

291 Indacom Dr, St Peters, MO 63376 · 11 mi from Lake St Louis

Call (636) 936-8243 Details Website

Verified Oct 2026 · Unclaimed listing

Builders Bloc

100/100
✓ MO Certified Backflow Tester Verified #06-1893 ★ 3.4 (18 reviews) 2 certified testers Backflow Testing

285 Chesterfield Business Pkwy, Chesterfield, MO 63005 · 12 mi from Lake St Louis

Call (314) 336-0200 Details Website

Verified Oct 2026 · Unclaimed listing

Chesterfield Service

100/100
✓ MO Certified Backflow Tester Verified #32-9598 ★ 4.9 (4483 reviews) 2 certified testers Backflow Testing

245 Chesterfield Industrial Blvd, Chesterfield, MO 63005 · 12 mi from Lake St Louis

Call (636) 532-5841 Details Website

Verified Oct 2026 · Unclaimed listing

Ozark Mechanical

100/100
✓ MO Certified Backflow Tester Verified #13-14144 ★ 5 (193 reviews) 2 certified testers Backflow Testing

2108 Parkway Dr, St Peters, MO 63376 · 13 mi from Lake St Louis

Call (636) 317-1234 Details Website

Verified Oct 2026 · Unclaimed listing

GDS Irrigation

100/100
✓ MO Certified Backflow Tester Verified #43-8400 ★ 4.7 (50 reviews) 3 certified testers Backflow Testing

200 Clearview Dr, St Charles, MO 63303 · 14 mi from Lake St Louis

Call (636) 724-8191 Details Website

Verified Oct 2026 · Unclaimed listing

Trio Plumbing Co.

100/100
✓ MO Certified Backflow Tester Verified #06-9200 ★ 4 (149 reviews) 4 certified testers Backflow Testing

2138 Hunters Way Ct, Chesterfield, MO 63017 · 16 mi from Lake St Louis

Call (636) 537-4938 Details Website

Verified Oct 2026 · Unclaimed listing

Wiegmann Associates

100/100
✓ MO Certified Backflow Tester Verified #13-11576 ★ 4 (8 reviews) 6 certified testers Backflow Testing

650 Fountain Lakes Blvd, St Charles, MO 63301 · 16 mi from Lake St Louis

Call (636) 940-1056 Details Website

Verified Oct 2026 · Unclaimed listing

Byrd Plumbing

100/100
✓ MO Certified Backflow Tester Verified #34-10742 ★ 4.3 (23 reviews) 2 certified testers Backflow Testing

500 Little Hills Industrial Blvd, St Charles, MO 63301 · 18 mi from Lake St Louis

Call (314) 867-5696 Details Website

Verified Oct 2026 · Unclaimed listing

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 Lake 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 Lake St Louis

Who can test a backflow preventer in Lake 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. Check the notice your utility sent.

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

Missouri's roster lists no for-hire testers based in Lake St Louis itself, and 89 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: City of Nixa certified backflow testers, City of Nixa.

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