BackflowNear Test-Due Reminder

Approved backflow testers in Severn, MD

74 backflow testing businesses work within 25 miles of Severn, 2 of them based in town. 14 have testers on Maryland's roster and 60 are on the approved tester list of 4 water utilities.

74 businesses within 25 miles

Backflow testing companies near Severn

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

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 · 1 mi from Severn

Call (443) 734-8609 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 · 1 mi from Severn

Call (410) 963-0204 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 · 4 mi from Severn

Call (410) 647-3030 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 · 7 mi from Severn

Call (410) 796-7532 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 · 7 mi from Severn

Call (410) 647-1106 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 · 7 mi from Severn

Call (410) 437-0300 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 Severn

Call (410) 799-7727 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 Severn

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

Call (410) 247-1422 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 · 9 mi from Severn

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

Naumann Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.3 (44 reviews) On Anne Arundel County listOn City of Rockville list Backflow Testing

2144 Priest Bridge Court Ste 1, Crofton, MD 21114 · 10 mi from Severn

Call (410) 451-6199 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 Severn

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

Howard Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (689 reviews) On Anne Arundel County list Backflow Testing

42 Hudson St Ste 212, Annapolis, MD 21401 · 12 mi from Severn

Call (410) 353-6215 Details Website
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 · 12 mi from Severn

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

Price reports

What a backflow test costs in Severn

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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.

Anne Arundel County Department of Public Works (water): backflow test rules

  • Who must test. Approved backflow preventers are required on point of use lines where needed, including residential fire suppression and lawn irrigation systems. Source.
  • How the report is filed. A state certified tester returns the test report to county DPW within 30 days of a passing test, and failed tests within 72 hours. Source.
  • Tester registration. Tests must be done by testers who are both certified and approved by Anne Arundel County. Source.
  • Approved testers. The county posts a voluntary list of licensed, certified plumbing companies that use its online test entry system at aacounty.org. Source.

Everything about Anne Arundel County Department of Public Works (water)'s backflow program

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 Severn 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 Severn

Where are the backflow testing businesses listed for Severn based?

74 backflow testing businesses are listed within 25 miles of Severn. 2 are based in Severn itself, 36 more within 15 miles and 36 further out, up to 25 miles away. Other towns with more than one listing: Columbia (5), Silver Spring (5) and Annapolis (4). The closest is Slo-Flo Plumbing, 1 mile from Severn.

Which tester lists are the businesses near Severn on?

14 have testers on Maryland's roster and 60 are on the approved tester list of 4 water utilities.

Which water utility sets the backflow test rules in Severn?

Anne Arundel County Department of Public Works (water). Who must test: Approved backflow preventers are required on point of use lines where needed, including residential fire suppression and lawn irrigation systems.

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

71 of the 74 listed for Severn 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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