BackflowNear Test-Due Reminder

Backflow testing in Upper Marlboro, MD

31 backflow testing businesses work within 25 miles of Upper Marlboro, 3 of them based in town. Every one is on the approved tester list of DC Water.

31 businesses within 25 miles

Backflow testing companies near Upper Marlboro

Welch & Rushe Inc

90/100
✓ MD Utility-Approved Tester Verified ★ 4.2 (10 reviews) On DC Water list Backflow Testing

391 Prince Georges Blvd, Upper Marlboro, MD 20774 · under 1 mile from Upper Marlboro

Call (301) 430-6004 Details Website

Verified Oct 2026 · Unclaimed listing

The Severn Group

90/100
✓ MD Utility-Approved Tester Verified ★ 4.5 (13 reviews) On DC Water list Backflow Testing

375 Prince Georges Blvd Ste.B, Upper Marlboro, MD 20774 · under 1 mile from Upper Marlboro

Call (240) 584-4551 Details Website

Verified Oct 2026 · Unclaimed listing

Free Line Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (170 reviews) On DC Water list Backflow Testing

9244 E Hampton Dr #607, Capitol Heights, MD 20743 · 6 mi from Upper Marlboro

Call (301) 499-0987 Details Website

Verified Oct 2026 · Unclaimed listing

H&D Mechanical LLC

90/100
✓ MD Utility-Approved Tester Verified ★ 4.2 (5 reviews) On DC Water list Backflow Testing

7703 Crain Hwy, Upper Marlboro, MD 20772 · 8 mi from Upper Marlboro

Call (443) 949-9842 Details Website

Verified Oct 2026 · Unclaimed listing

CRW Mechanical

90/100
✓ MD Utility-Approved Tester Verified ★ 3.9 (7 reviews) On DC Water list Backflow Testing

5807 Ellerbie St, Lanham, MD 20706 · 8 mi from Upper Marlboro

Call (301) 918-0056 Details Website

Verified Oct 2026 · Unclaimed listing

R&R Mechanical, LLC

90/100
✓ DC Utility-Approved Tester Verified ★ 3.8 (12 reviews) On DC Water list Backflow Testing

2902 Bladensburg Rd NE, Washington, DC 20018 · 13 mi from Upper Marlboro

Call (202) 636-9451 Details Website

Verified Oct 2026 · Unclaimed listing

WE Bowers

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

7101 Muirkirk Rd, Beltsville, MD 20705 · 15 mi from Upper Marlboro

Call (301) 419-2488 Details Website

Verified Oct 2026 · Unclaimed listing

Magnolia Plumbing Inc

90/100
✓ DC Utility-Approved Tester Verified ★ 4.4 (1519 reviews) On DC Water list Backflow Testing

600 Gallatin St NE, Washington, DC 20017 · 15 mi from Upper Marlboro

Call (888) 829-8510 Details Website

Verified Oct 2026 · Unclaimed listing

Durance Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.8 (73 reviews) On DC Water list Backflow Testing

7304 Carroll Ave #149, Takoma Park, MD 20912 · 16 mi from Upper Marlboro

Call (301) 270-6663 Details Website

Verified Oct 2026 · Unclaimed listing

A&E Plumbing Inc

90/100
✓ VA Utility-Approved Tester Verified ★ 4.3 (6 reviews) On DC Water list Backflow Testing

7069 Gateway Ct, Manassas, VA 20109 · 18 mi from Upper Marlboro

Call (703) 420-8260 Details Website

Verified Oct 2026 · Unclaimed listing

Thomas E Clark Inc

90/100
✓ MD Utility-Approved Tester Verified ★ 4.8 (339 reviews) On DC Water list Backflow Testing

2412 Linden Ln, Silver Spring, MD 20910 · 19 mi from Upper Marlboro

Call (301) 608-0550 Details Website

Verified Oct 2026 · Unclaimed listing

J&J Plumbing and Heating

80/100
✓ MD Utility-Approved Tester Verified ★ 5 (4 reviews) On DC Water list Backflow Testing

8326 26th Ave, Adelphi, MD 20783 · 15 mi from Upper Marlboro

Call (301) 343-5390 Details

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 · 16 mi from Upper Marlboro

Call (301) 395-4177 Details

Verified Oct 2026 · Unclaimed listing

Acker & Sons, Inc

90/100
✓ MD Utility-Approved Tester Verified ★ 4.6 (65 reviews) On DC Water list Backflow Testing

10516 Summit Ave, Kensington, MD 20895 · 21 mi from Upper Marlboro

Call (301) 897-0700 Details Website

Verified Oct 2026 · Unclaimed listing

ADJ Sheetmetal Inc

90/100
✓ MD Utility-Approved Tester Verified ★ 3.6 (19 reviews) On DC Water list Backflow Testing

4510 Graphics Dr, White Plains, MD 20695 · 23 mi from Upper Marlboro

Call (301) 283-3000 Details Website

Verified Oct 2026 · Unclaimed listing

Sky Plumbing

90/100
✓ MD Utility-Approved Tester Verified ★ 4.9 (177 reviews) On DC Water list Backflow Testing

12342 Wilkins Ave, Rockville, MD 20852 · 24 mi from Upper Marlboro

Call (240) 207-1212 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 Upper Marlboro 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 Upper Marlboro

Who can test a backflow preventer in Upper Marlboro?

A tester certified as Maryland's rules require, and accepted by your water utility. The companies here are on the approved list of DC Water: companies allowed to file backflow test reports in that system. Check the notice your utility sent.

How many backflow testing companies serve Upper Marlboro?

31 companies on the approved list of DC Water work within 25 miles of Upper Marlboro, 3 of them based in town.

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.

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

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