What a Backflow Valve Does

Backflow valves are used to prevent flooding.

A backflow valve is a device used in irrigation systems to protect water supplies from pollution or contamination. It prevents the reversal of water from a source of contamination back to clean water supplies.

Contamination

A backflow valve is installed at exit points in a basement or in sewer pipes. The valve closes immediately when sewage flows to ensure it does not return through the pipe and contaminate clean water.

Flooding

Besides preventing the contamination of clean water, backflow valves also minimize the risk of flooding. They are used to block drain pipes and prevent flow of water into the house during heavy rain.

Cost

The cost of installing a backflow valve varies depending on where you live. In Lousiana, for instance, a contractor may charge $525 to install one backflow valve (as of 2010). The cost includes excavation and backfilling.

References

• Louisiana State Gov: Louisiana Office Of Emergency Preparedness