Skip Navigation

Certified Backflow Preventer Service


A backflow prevention device is commonly required by plumbing codes in Maryland. You can rely on B&D Plumbing, Inc. for all of your residential and commercial plumbing needs, including testing and repair of your backflow preventer. In areas of high hazard water usage, this technology protects the community and our water source. Safe drinking water, and safe and healthy sewage management is a priority for all. From commercial needs to home needs to irrigation needs, we are certified to test and conduct repairs.

There are various devices for different purposes, including but not limited to the following

  • Air gap
  • Atmospheric vacuum breaker (AVB)
  • Check valve (usually not a legally approved method of backflow prevention)
  • Chemigation valve (primarily used in agriculture)
  • Double check valve, or double check valve assembly (DCVA)
  • Pressure vacuum breaker assembly (PVB)
  • Reduced pressure zone device (RPZ)
  • Spill resistant pressure vacuum breaker assembly (SPVB)
  • Vacuum breaker

One form of backflow prevention is to provide an air gap. An air gap is an open space between any fixture or appliance that connects to a plumbing system, and a place where contaminated water can gather. For example, at the drain connection for a dishwasher. Air gaps use only running water and no moving parts, so it’s a reliable and low-maintenance solution.

When there is not enough space for an air gap, a backflow preventer valve can be installed wherever there is a risk of contaminated water entering the water supply. Because these valves use moving parts, they are often required to be inspected or tested periodically. That’s where we come in.

We are a local family company, service geared and committed to a first-rate customer experience. Discover the peace of mind in working with a plumbing contracting company that promises to have an owner or family member on-site at all times. Known for our stellar customer service and attention to detail, we find tremendous satisfaction and value in leaving a happy client after a job well done. Born and raised in Maryland, we are an established part of the local community fabric, and we work hard to uphold our reputation.

Well respected in the industry, Bob and Dave are both members of the Master Plumbers Association WSMPA. Additionally, we have long-standing and personable relationships with the Washington Suburban Sanitary Commission WSSC, and Better Business Bureau. We stay on top of rules and regulation changes, so we are always equipped with the latest information about the how and the why. When you hire a B&D Master Plumber, you are hiring a quality plumber at a quality price.

Call Today for Your Free Estimate! 301-595-1141.