What is Backflow?

Backflow is the reversal of flow of a non-potable water supply into the piping of a public potable water supply which occurs when the conditions inside of the public water system change, causing the water to flow in the opposite direction. Backflow can easily cause potable water to become contaminated and polluted, making it unsafe for human consumption.

Preventing Backflow


- Submerge hoses in buckets, pools, tanks, sinks or ponds

- Use spray attachments without backflow prevention device

- Connect waste pipes from water softeners or other treatment systems to the sewer or submerged drain pipes

- Use a hose to unplug blocked toilets or sewers


- Keep the ends of hoses clear of all possible contaminants

- Install hose bib type vacuum breakers

- Install approved backflow prevention assembly on underground lawn irrigation system (plumbing permit required).

- Educate others on the importance of Backflow Prevention

Need to test your pipes for Backflow?

Provided here for your reference is a List of Certified Testers (PDF)

Backflow Prevention Test & Maintenance Report (PDF)