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Avoid backflow water contamination!

Protect your building’s water.


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Plumbing code is becoming even more regulated and it’s important that your building’s plumbing is up to par — for both your occupants and the state code.

backflow preventer testing

What is Backflow?

When there’s enough water pressure in your building’s plumbing, everything works as it should.

However, when there is a drop in water pressure due to a burst water main, frozen pipes, or a significantly higher demand on water supply, backflow can occur. The reduced pressure in the pipes can allow water from other sources to flow in the reserve direction, causing contamination.

Backflow in the water supply poses a serious health risk. This is why commercial plumbing code requires backflow preventers to be installed and maintained.

Backflow Prevention & How it Works

Backflow preventers or RPZ valves (reduced pressure zone valves) can be installed in your commercial building’s plumbing to prevent backflow.

When there is a decrease in water pressure and backflow could occur, the RPZ valve opens, allowing water out rather than allowing backflow to reverse into the water supply. In order to be compliant with plumbing code for commercial buildings, you must have backflow preventers installed and tested at least once a year by a professional plumber.

Count on Sobieski to Install Your Commercial Backflow Preventers

At Sobieski, our professional plumbing team is here to help your commercial building stay compliant with plumbing code. We can install backflow preventers, test them, and ultimately maintain them so your Delaware, Maryland, or Pennsylvania commercial property is code-compliant and protected.

Get your building up to plumbing code & prevent backflow contamination. Contact us or call 866-477-4404866-477-4394 to have your backflow preventers installed or tested today!


  • As a Commercial Property Manager I have seen my share of contractors. I have used Sobieski for all of our HVAC, plumbing and life safety needs. The office staff and field personnel are kind, professional and prompt. I feel like I am the only customer.

  • I've worked with Sobieski for many years. They have always stood out to me as a company who you can count on for quality workmanship, meeting demanding construction schedules, and taking care of the homeowner after settlement.