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Backflow Testing and Prevention

Plumbers For Harbor Springs, Charlevoix, Petoskey and More!

What Is Backflow?

Backflow Testing and PreventionAs the name implies, backflow is the reverse flow of waste water back into the clean water supply. Backflow can result in the contamination of the water supply, making drinking water unsafe to consume.

For backflow to occur, one of two conditions have to be present in the plumbing system – backpressure or back-siphonage. Backpressure happens when the downstream pressure in a water line is greater than the supply pressure. Back-siphonage is caused by a partial vacuum in the plumbing system. When the pressure in a system drops below 14.7 PSI (atmospheric pressure), it causes negative pressure, resulting in a siphon within the pipe.

Backflow can be caused by a number of conditions, including: high demand, such as when a fire hose is used down the line, a main line breakage, pump failure, or the collapse of a water column in an elevated line.

Backflow Prevention

To prevent backflow, plumbing systems employ different types of backflow assemblies and devices that work to prevent the water supply from flowing backwards. Some of these assemblies can be tested to ensure they are working correctly, while other devices, such as those used on outdoor hose bibs, cannot be tested. Because all plumbing systems eventually wear out, it's a good idea to have these systems inspected or tested to ensure they are working correctly.

At MacGregor Plumbing and Heating we are backflow prevention experts and can install the right cross connect backflow system in your home. If you have questions or would like more information on backflow prevention, give us a call anytime.

Professional Plumbing Services We Offer

  • Leaking Pipes
  • Faucet Repair & Replacement
  • Garbage Disposal Replacement
  • Outside Faucets
  • Bathroom & Kitchen Remodeling
  • Ice Maker Hookups
  • Re-Piping/Re-Routing
  • Whole-House Water Purification
  • Reverse Osmosis Systems
  • Appliance Hook-ups
  • Frozen Drain Lines
  • Water Heaters – Standard Tank-style & On Demand
  • Drain Cleaning
  • Sump Pumps
  • Water Pressure Problems
  • Water Closet Repair & replacement


Proudly serving the Emmet and Charlevoix areas for over 60 years

Call Anytime

A woman-owned business.

What Your Neighbors Are Saying...

  • "John followed up to a previous visit. He promised to service and flush our water heater. For this follow up visit, he arrived on time and quickly went to work. He not only flushed the water heater but also replaced the elements that were in bad shape. John was professional and extremely responsive and did an excellent job! " Read More
    – Timothy Manning
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