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1. What does this program mean for public health?

Backflow prevention devices help protect you and our community by preventing potentially contaminated water from coming back through water supply systems and into your home, business, or the public water supply.

2. When would a residence need backflow prevention?

If you have a lawn irrigation system at your home, you are required by the Missouri Department of Natural Resources to:

1. Have an approved backflow prevention device
2. Have the device tested annually

3. What does this program mean for commercial businesses?

• An approved backflow prevention device shall be installed at ALL potable water service lines entering the premises of all retail, commercial, and industrial facilities.
• An approved backflow prevention device shall be installed at any non-potable auxiliary water service connection within any facility where food services and public drinking fountains are present including:
  • chemical feed systems or soap additive devices
  • carbonated fountain machines
  • ice machines
  • steam tables
  • laundry machines
  • boiler feed systems
  • chillers
• An approved reduced pressure zone (RPZ) backflow prevention device shall be installed on all lawn irrigation and all fire protection systems with chemical additives present.  An approved RPZ or double-check (DC) backflow prevention device shall be installed on all fire protection systems without chemical additives present.