Backwater valve

Short description: Backflow prevention device

A backwater valve is a backflow prevention device used to prevent outbound water through a dwelling's drain pipes from re-entering -- "back flowing"—into a home. The valve contains a flap that allows water to exit the home, but closes to prevent the back flow into the home.[1]

Backwater valves commonly activate when a city's sewer lines are unable to handle a large amount of falling precipitation; this puts homes that are tied into the storm lines at risk of having water back flow into them.[citation needed]

There is a big difference between backwater valves and backflow preventers:[citation needed]

* A backwater valve prevents raw sewage from backing up into your home through your toilets, showers, etc.
* A backflow preventer deals with protecting a potable water source from being contaminated by a reverse flow of foul water (ex: isolating your toilet's flush cistern and water supply from the toilet bowl water itself).

## See also

* Check valve

## References

1. ↑ "Backwater Valve". https://www.london.ca/residents/Sewers-Flooding/Basement-Flooding-Causes/Pages/Backwater-Valve.aspx.

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