BackflowNear Test-Due Reminder

Backflow testing in Washington, DC

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

42 businesses within 25 miles

Backflow testing companies near Washington

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 · 2 mi from Washington

Call (202) 636-9451 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 · 4 mi from Washington

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 · 4 mi from Washington

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 · 6 mi from Washington

Call (301) 608-0550 Details Website

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 · 8 mi from Washington

Call (301) 897-0700 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 · 9 mi from Washington

Call (301) 918-0056 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 · 9 mi from Washington

Call (301) 499-0987 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 · 11 mi from Washington

Call (240) 207-1212 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 · 11 mi from Washington

Call (301) 419-2488 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 · 15 mi from Washington

Call (443) 949-9842 Details Website

Verified Oct 2026 · Unclaimed listing

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 · 15 mi from Washington

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 · 15 mi from Washington

Call (240) 584-4551 Details Website

Verified Oct 2026 · Unclaimed listing

DC Water (District of Columbia Water and Sewer Authority): backflow test rules

  • Who must test. Water customers must contract with DC Water approved backflow service providers for installation, annual testing and maintenance of their backflow prevention assemblies, and allow DC Water cross-connection site inspections. Source.
  • Notices and deadlines. A BPA deadline extension request (30 or 60 days) can be refused if it is not submitted 10 calendar days before the existing deadline; DC Water answers in writing within 14 calendar days. Source.
  • How the report is filed. DC Water's Acquaa Portal, launched June 2024, is used to submit BPA installation and inspection (test) results for residential and commercial customers. It replaced the BPA module of the Third-Party Portal (3PP). Source.
  • Tester registration. A backflow service provider must obtain approval from DC Water to inspect and test backflow prevention assemblies and survey sites, and reports results to DC Water. Source.
  • Fees. DC Water's fee schedule lists a Cross-Connection/Back Flow Prevention Monthly Fee of $6.20 per backflow prevention assembly per month; residential fire sprinkler assemblies are exempt (per the BPA fee FAQ). Source.

Everything about DC Water (District of Columbia Water and Sewer Authority)'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 Washington 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 Washington

Who can test a backflow preventer in Washington?

A tester certified as District of Columbia'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. In Washington, see DC Water (District of Columbia Water and Sewer Authority)'s rules below.

How many backflow testing companies serve Washington?

42 companies on the approved list of DC Water work within 25 miles of Washington, 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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