Backflow is the unwanted reversal of water flow in your plumbing, which can pull contaminants into your clean drinking water. Backflow prevention devices stop this, but they only work if they're tested and maintained.
How backflow happens
A sudden pressure change, such as a water main break or heavy demand from firefighting, can reverse the normal flow direction and siphon contaminated water back into the supply.
Who needs testing
Many commercial properties, and some residential ones with irrigation systems or special connections, are required to have backflow preventers tested regularly to stay compliant.
What testing involves
A certified technician checks that the device holds pressure and seals correctly, documenting the results for code compliance.
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