Service Area

We are licensed and insured to test and repair all make model and sizes of backflow assemblies in Maryland, Virginia, West Virginia, Delaware, Pennsylvania and the District of Columbia.

What We Do


Professional Testing: Our certified backflow technicians are highly trained and licensed in every jurisdiction we serve. In addition we use only the highest quality gauging equipment which are calibrated on a regulated schedule. Accurate testing is paramount for successful diagnostics of faulty RPZ and Double Check Valve assemblies. Incorrect readings could result in unnecessary and costly repairs.

Repairs:  As required by Maryland code our technicians are also licensed plumbers assuring you of professional service. Repair parts are costly and we are experts at getting it right the first time saving time and money. As for parts, we use only original manufacturers factory replacement components, assuring the right fit for your device.

The Paperwork
 From tagging the device in the field to the filing of  forms with your local agency, we handle it all. Year after year you can be assured that you are in compliance with all annual testing and reporting requirements. Our extensive database enables us to efficiently generate detailed reports on all your backflow devices as well as automatically inform you thirty days in advance of due test dates.

New Installations and Retrofits: Industrial, commercial or residential, we determine your backflow prevention needs and install the proper device. We also schedule and meet with local inspectors as required by law. Licensed in Md. Del. Va. and DC., we know your local codes.

Site Assessment: Included as part of all our services. We identify and record the location of all existing backflow assemblies on your property. In addition to locating your existing devices, we also inspect your plumbing and piping systems for other potential cross-connections.


What is backflow?

Water normally flows in one direction, from the City’s drinking water system to the pipes in your premises. Backflow is the flow of water in the opposite direction. Backflow can contaminate either the potable water within your building or the City’s drinking water system. There are two situations that can cause backflow:

  •  Back-siphonage,  the pressure in the City’s drinking water system drops due to activities that draw a lot of water from the system (e.g., firefighting, water main breaks, cleaning the water mains). The water in your pipes is sucked back into the City’s drinking water system.
  • Back-pressure , the pressure in your system increases (e.g., due to devices such as a booster pump, pressure vessel, pressure type chemical injector, boiler, or elevated plumbing). The water in your pipes is forced back into the City’s drinking water system

What is a cross-connection?

A cross-connection is an actual or potential connection between the drinking water supply and a source of contamination in a plumbing system. When a cross-connection is not properly protected, and a backflow situation occurs, contaminants can enter the drinking water system or the water pipes on your premises. An example is the common garden hose attached to a sill cock with the end of the hose lying in a cesspool. Other examples are a garden hose attached to a service sink with the end of the hose submerged in a tub full of detergent.

How is the type of backflow prevention device selected?

The device is selected based on the degree of hazard to public health and the type of backflow it is controlling. There are three degrees of hazard: Severe – any cross-connection or potential cross-connection to any substance that could be a danger to health. Severe hazards are typically found in industrial, commercial facilities, hospitals and mortuaries. Moderate – any minor hazard that has a low probability of becoming a severe hazard. Moderate hazards are typically found in office buildings, schools, shopping malls, and high-rise buildings. Minor – any cross-connection or potential cross-connection that is primarily a nuisance with a very low probability of becoming a health hazard. Minor hazards are typically found in residential homes, hair salons and restaurants.

Why do backflow prevention devices have to be tested annually?

Mechanical backflow prevention devices have internal seals, springs and moving parts that can become dirty and wear out. They must be tested annually with properly calibrated equipment to ensure they are working properly.

Who is responsible to test and maintain the backflow prevention device?

It is up to the property owner to ensure the device is installed correctly,  properly maintained and repaired and tested at the time of installation, and once a year thereafter. Assemblies also need to be retested if any maintenance or repairs are performed on the device

How much does a backflow test cost?

Our prices range from $99.00 to $250.00 for testing. That is because there are more than 3000 backflow assemblies approved for installation in North American plumbing systems. These backflows are utilized in most every commercial/industrial building and a growing number of residential homes. We offer competitive pricing for every application of backflow assemblies.