Our team has years of experience handling commercial plumbing needs. From a simple (or not-so-simple) drain clog to running new sewer lines or installing a new water heating system, we can handle any light commercial plumbing repair you throw our way. We offer emergency service 24/7. Call our service number at (443) 506-2503 and we'll get someone out as soon as possible. Our goal is to resolve the problem quickly and keep your business or building operational.

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Our Plumbing Services

Our wide range of products and services includes:

  • Backflow Devices & Testing
  • Drain Clogs
  • Faucet Repair
  • Fit Outs & Alterations
  • Fixtures & Appliances of All Types
  • Gas Lines
  • Lint Traps
  • Pipe Replacement
  • Sand Traps
  • Sump Pumps
  • Water & Sewer Lines
  • Water Heaters

Backflow Testing & Device Replacement

Maryland state plumbing code requires that backflow devices are tested annually for the safety of your family and your neighbors. McAllister Plumbing is certified to provide testing for both residential and commercial backflow systems and we also replace backflow devices when needed. As required by Anne Arundel County, our testing equipment is inspected and calibrated annually.

What is Backflow?

Backflow is when water flows backward into the water distribution system, caused by sudden or gradual changes in pressure in plumbing systems. There are two main causes of backflow:

  • Sudden reductions in water pressure in the distribution system, for example, when water mains break or firefighting occurs.
  • Recirculation of water through pumps, thermal expansion and elevation, which can cause higher water pressures than the incoming water supply.

These changes in pressure can cause the water to reverse its direction as it flows through the plumbing system, creating backflow.

Family Owned Since 2006 Serving Baltimore & Surrounding Areas View Counties Served