BackflowNear Test-Due Reminder

Backflow testing in Gaithersburg, MD

36 backflow testing businesses work within 25 miles of Gaithersburg, 5 of them based in town. Every one is on the approved tester list of DC Water.

36 businesses within 25 miles

Backflow testing companies near Gaithersburg

Harvey W. Hottel

90/100
✓ MD Utility-Approved Tester Verified ★ 4.1 (48 reviews) On DC Water list Backflow Testing

18900 Woodfield Rd, Gaithersburg, MD 20879 · under 1 mile from Gaithersburg

Call (301) 461-0622 Details Website

Verified Oct 2026 · Unclaimed listing

James A Wheat & Sons

90/100
✓ MD Utility-Approved Tester Verified ★ 4.8 (1300 reviews) On DC Water list Backflow Testing

7834 Beechcraft Ave, Gaithersburg, MD 20879 · under 1 mile from Gaithersburg

Call (301) 670-1944 Details Website

Verified Oct 2026 · Unclaimed listing

JF Plumbing & Heating

90/100
✓ MD Utility-Approved Tester Verified ★ 4.8 (137 reviews) On DC Water list Backflow Testing

15751 Crabbs Branch Way, Derwood, MD 20855 · 4 mi from Gaithersburg

Call (301) 840-3830 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 · 8 mi from Gaithersburg

Call (240) 207-1212 Details Website

Verified Oct 2026 · Unclaimed listing

Delmar Plumbing, LLC

80/100
✓ MD Utility-Approved Tester Verified ★ 3.3 (16 reviews) On DC Water list Backflow Testing

2 Hilton Ct, Gaithersburg, MD 20882 · 6 mi from Gaithersburg

Call (301) 774-2355 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 · 11 mi from Gaithersburg

Call (301) 897-0700 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 · 13 mi from Gaithersburg

Call (301) 608-0550 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 Gaithersburg

Call (301) 270-6663 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 · 17 mi from Gaithersburg

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 · 18 mi from Gaithersburg

Call (888) 829-8510 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 · 19 mi from Gaithersburg

Call (703) 420-8260 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 · 16 mi from Gaithersburg

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 · 17 mi from Gaithersburg

Call (301) 395-4177 Details

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 · 20 mi from Gaithersburg

Call (202) 636-9451 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 Gaithersburg 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 Gaithersburg

Who can test a backflow preventer in Gaithersburg?

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 Gaithersburg?

36 companies on the approved list of DC Water work within 25 miles of Gaithersburg, 5 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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