Backflow Preventers in Maryland

Call 301-953-2846 for Backflow Testing in Anne Arundel County!

Clean water is essential to your health both at home and at work. A backflow preventer can stop stagnant water from entering your water line if your fire suppression system fails. Look to Water Doctor for residential or commercial backflow preventer services in Maryland.

Our team can test your device and perform any repairs or a replacement to ensure your property stays up to code. We’ll even stay in touch to ensure that you get the annual testing you need.

Avoid backflow issues with help from Water Doctor. Schedule services with us online now.

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Backflow Services Offered

Water Doctor provides comprehensive backflow preventer services for property owners in Maryland. We have the tools and expertise needed to install new units, repair old ones, maintain backflow preventers, and test the units as needed.

Installation of Backflow Preventers

Our team can install a backflow preventer, attaching it directly to your water line to avoid backflow issues from your fire suppression system. With this unit installed by a pro, you can be confident that your system is as safe as possible from backflow issues. We’ll also make sure that you get the right backflow preventer for your property.

Maintenance and Repair

Regular maintenance can make a huge difference for your backflow preventer. An annual tune-up of the system can keep it working like new. If a repair is needed, our team is on it. We can repair assemblies, bonnets, valves, handles, and more.


Keep your backflow preventer up to code and working properly with annual testing. We can test the valves against back pressure, test the shutoff valve for tightness, test the differential pressure relief valve, and more.

Why You Need a Backflow Preventer

A backflow preventer is a vital addition for many properties. Just a few reasons you may need a backflow preventer include:

  • Protecting the local water supply: These units help protect the local water supply from contamination. When the local water supply has a major change in pressure, it could trigger a backflow issue that delivers sewage into the local line. A backflow preventer can help avoid these issues.
  • Complying with local regulations: Some municipalities may require backflow preventers to be installed at certain properties. In these cases, you need to work with a pro to add these units to your home or business. If refused, you may be subject to fines.

Make sure your water system is in tiptop shape with a backflow preventer. Reach out online now to schedule backflow preventer services.

Types of Water Backflow Preventers

ASSE 1013 RPZ and ASSE 1015 DCVA backflow preventers are required to be tested and certified annually. Read more to find out about these models.

Reduced Pressure Zone Type ASSE 1013

This design consists of two independently acting check valves. The valves are internally force loaded to a normally closed position and separated by an intermediate chamber. This backflow preventer is designed to operate under continuous pressure conditions and is used in high-hazard situations.

Double Check Valve Assembly Type ASSE 1015

This device consists of two independently acting check valves, which are internally force loaded to a normally closed position. They also contain two properly located, tightly closing shut-off valves. The ASSE 1015 is designed and constructed to operate under intermittent or continuous pressure conditions.

Pressure Vacuum Breaker (PVC)

These devices are designed to protect against back siphonage only.  The PVC is commonly found outside on a Lawn Sprinker System.  Yearly testing of this device in required in Maryland.

Backflow Preventers in Annapolis, Gaithersburg, Bethesda & Germantown, MD

The team at Water Doctor is set on ensuring your total satisfaction. From small plumbing repairs to major plumbing overhauls, we do it all, up to code and to your liking.

Since 1979, we’ve been delivering top-tier plumbing services throughout Maryland. Count on us for certified technicians, complete repairs, proper installations, and essential maintenance.

Schedule backflow preventer installation in Maryland now.

Frequently Asked Questions: Backflow Prevention

What is backflow?

Backflow is an undesirable reversal of flow of non-potable water or other substances through a cross-connection and into the piping of a public water system or a consumer’s potable water system.

What is potable water?

Potable water is water that is safe for human consumption, free from harmful microbiological or chemical substances as described by federal and state drinking water regulations.

How does backflow occur?

Backflow may occur due to high pressure on the customer side, or low pressure in the water system. Backflow through a cross-connection can contaminate the potable water in a building, on a block, or throughout an entire water system.

Does the backflow preventer protect my entire facility?

No. The required backflow prevention assembly provides containment, and it protects the public water system from hazards in your facility. Cross-connections in your own plumbing may allow contaminants to backflow from hazardous processes to drinking water taps in your building.

How much will backflow preventer installation or testing cost?

The cost of having a backflow prevention device installed or tested varies. The cost is also dependent on several factors, including the size of the device, where the device is located, the type of device, etc. Give Water Doctor a call for a quote.

What areas of my business need protection from a backflow?

There are many areas of a business that require backflow preventers, including:

  • Landscape irrigation systems
  • Boilers
  • Fire protection systems
  • Post-mix soda machines
  • Water tank or chemical storage
  • Laboratory or medical clinics
  • And more!

Additional Resources

Want to learn more about backflow preventers? Check out these articles to educate yourself further:

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Anne Arundel | Howard | Baltimore | Frederick | Montgomery | Carroll | Charles | Calvert | Queen Anne's | Harford