BackflowNear Test-Due Reminder

Approved backflow testers in Columbia, MD

93 backflow testing businesses work within 25 miles of Columbia, 5 of them based in town. 18 have testers on Maryland's roster and 75 are on the approved tester list of 4 water utilities.

93 businesses within 25 miles

Backflow testing companies near Columbia

What the badges mean
✓ MD Certified Backflow Tester Verified
A state roster lists at least one certified tester at this business, with a current certificate. The state sets the exam and renewal.
✓ MD 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.

Are you a backflow testing company near Columbia? One sponsor per county, clearly labelled. Sponsor this county

Lloyd Plumbing Corporation

90/100
✓ MD Utility-Approved Tester Verified ★ 4.3 (6 reviews) On Anne Arundel County listOn City of Rockville list Backflow Testing

9691 Gerwig Ln # I, Columbia, MD 21046 · 3 mi from Columbia

Call (410) 203-2720 Details Website
Verified Oct 2026 · Unclaimed listing

Heil Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (2709 reviews) On Anne Arundel County listOn City of Rockville list Backflow Testing

8177 Mission Rd, Jessup, MD 20794 · 5 mi from Columbia

Call (410) 799-7727 Details Website
Verified Oct 2026 · Unclaimed listing

JA Smith & Company

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (34 reviews) On Anne Arundel County list Backflow Testing

7080 Kit Kat Rd, Elkridge, MD 21075 · 5 mi from Columbia

Call (410) 796-7532 Details Website
Verified Oct 2026 · Unclaimed listing

Fireline Corporation

90/100
✓ MD Utility-Approved Tester Verified ★ 3.5 (51 reviews) On Anne Arundel County list Backflow Testing

4506 Hollins Ferry Rd, Baltimore, MD 21227 · 10 mi from Columbia

Call (410) 247-1422 Details Website
Verified Oct 2026 · Unclaimed listing

Youngblood HVAC

80/100
✓ MD Utility-Approved Tester Verified ★ 3.4 (5 reviews) On DC Water list Backflow Testing

1033 Baltimore Ave, Beltsville, MD 20705 · 9 mi from Columbia

Call (301) 395-4177 Details
Verified Oct 2026 · Unclaimed listing

WE Bowers

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (15 reviews) On DC Water listOn WSSC Water list Backflow Testing

7101 Muirkirk Rd, Beltsville, MD 20705 · 11 mi from Columbia

Call (301) 419-2488 Details Website
Verified Oct 2026 · Unclaimed listing

Carson Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 5 (181 reviews) On Anne Arundel County list Backflow Testing

1420 Washington Ave, Severn, MD 21144 · 11 mi from Columbia

Call (410) 963-0204 Details Website
Verified Oct 2026 · Unclaimed listing

Madden Plumbing & HVAC Inc

90/100
✓ MD Utility-Approved Tester Verified ★ 4.8 (16 reviews) On DC Water listOn WSSC Water listOn Anne Arundel County listOn City of Rockville list Backflow Testing

6872 Distribution Dr, Beltsville, MD 20705 · 11 mi from Columbia

Call (301) 937-1000 Details Website
Verified Oct 2026 · Unclaimed listing

Slo-Flo Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 5 (256 reviews) On Anne Arundel County list Backflow Testing

792 Jennie Dr, Severn, MD 21144 · 12 mi from Columbia

Call (443) 734-8609 Details Website
Verified Oct 2026 · Unclaimed listing

Reliable Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 1 (3 reviews) On City of Rockville list Backflow Testing

21509 Ripplemead Dr, Gaithersburg, MD 20882 · 14 mi from Columbia

Call (301) 948-1991 Details Website
Verified Oct 2026 · Unclaimed listing

Price reports

What a backflow test costs in Columbia

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Published prices nationwide

$29.99 to $100 per assembly

Based on 14 published prices · Read Oct 2026 Prices testing businesses list on their own websites, from our cost guide. Listed prices, not what people paid.

Every published price, with its source: what a backflow test costs.

Failed test? Published repair, rebuild and replacement prices: what a backflow repair or replacement costs.

Had your backflow test done? Share what you paid to see local prices.

Metro guide: Backflow testing in Washington, DC: every utility's rules, filing portals and published prices in one place.

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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 Columbia 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 Columbia

Where are the backflow testing businesses listed for Columbia based?

93 backflow testing businesses are listed within 25 miles of Columbia. 5 are based in Columbia itself, 26 more within 15 miles and 62 further out, up to 25 miles away. Other towns with more than one listing: Gaithersburg (11), Rockville (7) and Silver Spring (5). The closest is Smith Mechanical, Inc., 1 mile from Columbia.

Which tester lists are the businesses near Columbia on?

18 have testers on Maryland's roster and 75 are on the approved tester list of 4 water utilities.

How many of the backflow testing businesses near Columbia have Google reviews?

88 of the 93 listed for Columbia have 3 or more Google reviews. Heil Plumbing has the most reviews, 2,709, with an average of 4.9 stars, as Google showed them at our last check.

Approved list: WSSC Water plumbing firms providing cross-connection related services, WSSC Water.

Approved list: Backflow Prevention Assembly Service Providers, DC Water.

Approved list: Anne Arundel County accepted plumbing companies providing backflow related services, Anne Arundel County Department of Public Works.

Approved list: City of Rockville certified backflow prevention testers, City of Rockville Department of Public Works.

Related site: Testing a fire line? The sprinkler system behind it needs its own inspections by a state-licensed fire protection company. Licensed fire sprinkler inspectors near Columbia on FireInspectorNear, our sister directory.

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