Backflow Testing Services in Baltimore, Maryland
Finding a reliable backflow testing professional in Baltimore, Maryland is essential for maintaining a safe water supply and staying in compliance with local regulations. Our directory lists 31 backflow testing companies serving Baltimore and surrounding communities including Dundalk, Catonsville, Woodlawn.
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 Baltimore area.
Most water authorities in Maryland 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 Baltimore 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.
31 listed providers
Roto-Rooter Plumbing & Water Cleanup
Baltimore, MD · < 1 mi
Nationwide Plumbing & Heating
Testing Verified · Halethorpe, MD · 3 mi
“Called for a quote of a replacement of my water heater, and receive GREAT customer service and a VERY reasonable total for the work to be done. I will be referring yall to my neighbors, friends, and…”
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Mr. Rooter Plumbing of Greater Baltimore
Baltimore, MD · 4 mi
“On late Friday evening, I had a flood in my home. The water was coming through my refrigerator and it leaked down to my basement.. I called one of the popular plumbing services. They came out only to…”
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A & A Construction And Utilities, Inc.
Baltimore, MD · 5 mi
Roto-Rooter Plumbing & Water Cleanup
Dundalk, MD · 5 mi
“After an almost 12-hr work day, I arrived home to an intermittent gurgling sound coming from my bathroom. I immediately turned the shut-off valve to the off position and contacted Roto-Rooter. Brian…”
Read more on GoogleD W Bahr Plumbing & Heating Co
Testing Verified · Baltimore, MD · 6 mi
“I ordered a new cast iron kitchen sink, faucet and garbage disposal from Home Depot. At my request, Home Depot contacted one of their trusted plumbing companies, D W Bahr Plumbing and Heating…”
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Roto-Rooter Plumbing & Water Cleanup
Linthicum Heights, MD · 6 mi
Metcalf Plumbing Service, LLC
Catonsville, MD · 7 mi
“I had gotten three quotes from other plumbing companies to replace the entire drain stack in my home. None of the quotes really specified what work was to be done and the prices were magically round…”
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Trust Plumbing & Heating, LLC
Testing Verified · Baltimore, MD · 7 mi
“Trust was wonderful to work with. My water heater busted and flooded my basement. They got to my home quickly, competently diagnosed the problem and took the time to explain my options for…”
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Albright's Mechanical Services
Testing Verified · Essex, MD · 8 mi
Prime Plumbing
Testing Verified · Glen Burnie, MD · 9 mi
“It's taken me a while to write a review with two young kids- but i wanted to make sure i shared what a wonderful experience we had using Prime Plumbing. We had a sewer line back up in our basement…”
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F.H. Furr Plumbing, Heating, Air Conditioning & Electrical
Glen Burnie, MD · 10 mi
Roto-Rooter Plumbing & Water Cleanup
Ellicott City, MD · 10 mi
Roto-Rooter Plumbing & Water Cleanup
Elkridge, MD · 11 mi
SLO-FLO Plumbing
Testing Verified · Severn, MD · 11 mi
“I had Slo-Flo Plumbing come out on 10/17/2024 to replace my main water line, and I couldn’t be happier with the service! They arrived on time and immediately impressed me with their professionalism…”
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Alpha Plumbing
Pasadena, MD · 12 mi
“Found Alpha Plumbing off Angi while looking for a local company. A+ BBB reviews. Arrived on time with everything needed. Quickly and efficiently replaced my leaking pressure valve. Workmanship…”
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Anne Arundel Plumbing, Inc.
Pasadena, MD · 12 mi
“We purchased a home after moving to the area and were not familiar with sump pumps and ground saturation, so we really didn't know where to start when our crawlspace was flooded with standing water…”
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Chesapeake Plumbing, Inc
Testing Verified · Pasadena, MD · 12 mi
“I was very pleased with the work that David from Chesapeake Plumbing, Inc. did. The one toilet had been spraying a fine mist which I felt might be the beginning of a leak and the handle on the shower…”
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Roto-Rooter Plumbing & Water Cleanup
Jessup, MD · 13 mi
1st Choice Plumbing & Backflow Prevention, LLC
Testing Verified · Pasadena, MD · 14 mi
“Moving into a new home is supposed to be exciting, but discovering a sewer backup and basement flooding was an absolute nightmare. Thankfully, Matt from 1st Choice Plumbing and Backflow Prevention…”
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Associates Plumbing, Inc.
Testing Verified · Columbia, MD · 15 mi
Five Star Plumbing Services
Testing Verified · Joppatowne, MD · 18 mi
“I don’t write post often but feel compelled to share my experience with Five Star Plumbing. I had a water line leak originating from the outside and leaking into my basement. Unfortunately, my home…”
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North River Plumbing & Gas, LLC
Testing Verified · Gambrills, MD · 19 mi
Pipeline Training Institute
Testing Verified · Sykesville, MD · 19 mi
“Class was professional presented, the professor knowledge of cross contamination as it relates to the different types of contamination hazards, which DCV, BP, and VB devices that should be used on…”
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Frequently Asked Questions About Backflow Testing in Baltimore
Most jurisdictions in Maryland 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 Baltimore 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 Baltimore 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.
Backflow testing in Baltimore, Maryland typically costs between $50 and $200 per device, depending on the type of backflow preventer and the complexity of the installation. RPZ assemblies generally cost more to test than double check valve assemblies. Contact providers listed above for current pricing in the Baltimore area.
If a backflow preventer fails its annual test, the certified tester will diagnose the issue — often a worn check valve, damaged disc, or fouled relief valve. Most testers in Baltimore can repair the device on site and re-test it the same day. Your water authority may require the passing report within a set deadline.
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