Backflow Testing Services in Fairfax, Virginia
Finding a reliable backflow testing professional in Fairfax, Virginia is essential for maintaining a safe water supply and staying in compliance with local regulations. Our directory lists 25 backflow testing companies serving Fairfax and surrounding communities including Burke, Oakton, Annandale.
Whether you need annual backflow testing, RPZ (Reduced Pressure Zone) valve inspection, or cross-connection control services, the providers listed below offer professional testing services for both residential and commercial properties throughout the Fairfax area.
Most water authorities in Virginia require annual testing and reporting for all backflow prevention assemblies. A certified backflow tester will inspect your devices, perform the required differential pressure tests, and file compliance reports with your local water authority.
Browse the listings below to compare ratings, read customer reviews, and contact backflow testing professionals near Fairfax directly. Use the filters above to narrow results by rating, review count, or specific services like RPZ testing and preventer installation.
Data source: Google Maps. Always verify licensing with your local water authority.
25 listed providers

Pioneer Plumbers
Testing Verified · Fairfax, VA · < 1 mi
Roto-Rooter Plumbing & Water Cleanup
Springfield, VA · 4 mi

Back Flow Services Done Right
Testing Verified · FX STATION, VA · 5 mi
“Andy handled our backflow repairs fast! He communicated every step of the repair and was a true professional. If you are looking for a plumbing contractor that takes pride in his work this is the…”
Read more on Google
Baumbach Plumbing & Remodeling services llc
Testing Verified · Fairfax Station, VA · 5 mi
“This company lives up to the high rating on Google. Around 9pm I had a busted pipe in my basement, no hot water. A quick Google search later, I chose to call Baumbach’s based on the reviews. Andy…”
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John C. Flood
Alexandria, VA · 7 mi
“I came home to a flooded basement and a leaking water heater. I called John C Flood and they sent Nassim S. I immediately felt at ease with him! He was super knowledgeable and took something that was…”
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ABCO Plumbing Company LLC
Testing Verified · Vienna, VA · 7 mi
Sertec LLC
Testing Verified · Alexandria, VA · 8 mi

F.H. Furr Plumbing, Heating, Air Conditioning & Electrical
Lorton, VA · 9 mi
Roto-Rooter Plumbing & Water Cleanup
McLean, VA · 9 mi
O'Neill Plumbing Services L.L.C.
Alexandria, VA · 9 mi
Roto-Rooter Plumbing & Water Cleanup
Arlington, VA · 9 mi

Alexandria Plumbing Pro Services
Alexandria, VA · 10 mi
Roto-Rooter Plumbing & Water Cleanup
Alexandria, VA · 12 mi
“Delighted with the quick response to our sewer line blockage, they got a technician out to us within an hour of my call. The service include running the cutter snake as well as a camera afterwards so…”
Read more on GoogleFerguson Plumbing Supply
Alexandria, VA · 12 mi
“It’s the little things…… I called in search of a small o-ring and was the attendant wasn’t certain they had what I needed but encouraged me to come down and show them the part I was looking for. I…”
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DB's Plumbing and Drain®
Testing Verified · Woodbridge, VA · 12 mi

Emerald Plumbing Co.
Alexandria, VA · 13 mi
“Five-Star Review for Somerville and Their Inside Sales Manager Andy I have been working with Somerville for close to twenty years and I can say without hesitation that Andy is the heart and soul of…”
Read more on GoogleHydro-Tech, Co.
Testing Verified · Sterling, VA · 15 mi
“Our experience with Hydrotech was one of the best relationships we have had in our recent large-scale landscaping project. We had a challenging, low-output well system that required real…”
Read more on GoogleBG Outdoor Services
Testing Verified · Sterling, VA · 15 mi
Backflow Technology, LLC
Testing Verified · Ashburn, VA · 17 mi
Helpful resources
Frequently Asked Questions About Backflow Testing in Fairfax
Look for testers with active state certification, strong Google reviews, and experience with your type of backflow preventer (PVB, DCVA, or RPZ). Ask whether they file compliance reports with your local water authority and request a written estimate before scheduling. Our directory lists testers near Fairfax with real customer reviews.
RPZ (Reduced Pressure Zone) testing verifies that your reduced pressure backflow preventer is functioning correctly to protect your water supply from contamination. A certified tester uses specialized gauges to measure differential pressures across the assembly. RPZ devices are typically required for high-hazard connections.
Most jurisdictions in Virginia require backflow testers to hold a current certification from an approved training program, typically involving classroom instruction, a hands-on practical exam, and continuing education credits. Some municipalities maintain their own approved-tester lists. Always verify certification before hiring.
Residential tests typically involve a single PVB or DCVA device and are quicker to complete. Commercial properties in Fairfax often have multiple assemblies, RPZ devices, and fire-line backflow preventers that require more time and specialized equipment. Pricing and scheduling may differ for each type.
Many certified backflow testers in Fairfax will file test reports directly with your local water authority or municipality on your behalf. Confirm this with your provider before scheduling. Some jurisdictions require the property owner to submit reports, while others accept direct submissions from the tester.
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