What is a backflow preventer?

Why you need to know about

This page includes detailed, need-to-know, information for residential water customers.

  • Is your water system at risk because of you?
  • Are you doing your part?
  • What’s the big deal?

What is a Cross Connection and what is Backflow?

Cross-Connection – is the physical connection between the potable (drinking) water system and an “end-use” (water utilizing fixture, equipment, or process) where a potential water contaminating hazard exists.

Backflow is caused by cross-connections that have the potential of allowing contaminants into the drinking water system. Back siphonage can occur when the pressure in a tank or water trough is lower than the water system’s pressure. This could allow the influx, or pulling, of contaminated water into the system.

backflow preventer is a device that’s installed on your home’s water pipes that allows water to flow in one direction but never in the opposite direction. Its sole job is to prevent drinking water from being contaminated due to backflow.

Other Water Uses

Consult with a licensed plumber regarding proper connection and protection requirements or contact a Crestline Service Department inspector at (419) 683-3800

Best Management Practices

Understanding and respecting the risk of water contamination is a great start, when in doubt, seek help. Basic guideline: every water outlet needs some form of protection; get to know what is needed.

Have “non-testable” backflow devices replaced at the intervals described above. Have “testable” backflow assemblies tested yearly and rebuilt or replaced as needed (usually every 5-8 years).

Questions or Concerns? Send us a message.

If you would like more information about Backflow Prevention and Cross Connection Control for your home or business, send us a message to day using the convenient online form below.