BackflowNear Test-Due Reminder

Approved backflow testers in Halethorpe, MD

57 backflow testing businesses work within 25 miles of Halethorpe, 2 of them based in town. 11 have testers on Maryland's roster and 46 are on the approved tester list of 4 water utilities.

57 businesses within 25 miles

Backflow testing companies near Halethorpe

Most of these businesses are also listed on Baltimore, MD.

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 Halethorpe? One sponsor per county, clearly labelled. Sponsor this county

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 · under 1 mile from Halethorpe

Call (410) 247-1422 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 · 6 mi from Halethorpe

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

Mahon Plumbing Inc.

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (284 reviews) On City of Rockville list Backflow Testing

6824 Fort Smallwood Rd Ste. A, Baltimore, MD 21226 · 8 mi from Halethorpe

Call (410) 766-8566 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 · 8 mi from Halethorpe

Call (443) 734-8609 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 · 8 mi from Halethorpe

Call (410) 799-7727 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 · 9 mi from Halethorpe

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

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 · 10 mi from Halethorpe

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

Russell R. Dwyer, Inc.

90/100
✓ MD Certified Backflow Tester Verified ★ 4.8 (21 reviews) On WSSC Water listOn Anne Arundel County list Backflow Testing

8377 B Jumpers Hole Rd, Millersville, MD 21108 · 11 mi from Halethorpe

Call (410) 647-3030 Details Website
Verified Oct 2026 · Unclaimed listing

Anne Arundel Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.5 (75 reviews) On Anne Arundel County list Backflow Testing

7930 Wooded Glen Ct, Pasadena, MD 21122 · 11 mi from Halethorpe

Call (410) 437-0300 Details Website
Verified Oct 2026 · Unclaimed listing

1st Choice Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (147 reviews) On Anne Arundel County list Backflow Testing

4471 Mountain Rd, Pasadena, MD 21122 · 13 mi from Halethorpe

Call (443) 790-9571 Details Website
Verified Oct 2026 · Unclaimed listing

B&C Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.6 (15 reviews) On Anne Arundel County list Backflow Testing

516 Pine Tree Dr, Severna Park, MD 21146 · 14 mi from Halethorpe

Call (410) 647-1106 Details Website
Verified Oct 2026 · Unclaimed listing

Price reports

What a backflow test costs in Halethorpe

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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.

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Backflow testing questions in Halethorpe

Where are the backflow testing businesses listed for Halethorpe based?

57 backflow testing businesses are listed within 25 miles of Halethorpe. 2 are based in Halethorpe itself, 29 more within 15 miles and 26 further out, up to 25 miles away. Other towns with more than one listing: Columbia (5), Annapolis (4) and Baltimore (4). The closest is Nationwide Plumbing & Heating LLC, under 1 mile from Halethorpe.

Which tester lists are the businesses near Halethorpe on?

11 have testers on Maryland's roster and 46 are on the approved tester list of 4 water utilities.

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

54 of the 57 listed for Halethorpe 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.

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