Backflow & Cross Connection Control

The purpose of the Cross Connection Control Program is to protect the City’s public potable water system and its customers from contamination by backflow from private water plumbing and water use facilities.

Backflow & Cross Connections


Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. It can be a serious health risk for the contamination of potable water supplies with foul water.


Backflow due to an increased pressure above the supply pressure, which may be due to pumps, boilers, gravity, or other sources of pressure.


The reserve flow of water or other liquids, mixtures, gases or substances into the distribution pipes caused by negative or sub atmospheric pressure.

Cross Connection

A cross connection is any physical arrangement whereby a potable water supply is connected, directly or indirectly, with any of the following which may be capable of imparting contamination or pollution to the potable water supply as a result of backflow:

  • Conduit
  • Drain
  • Plumbing fixture
  • Sewer
  • Tank
  • Water supply system
  • Other assembly which contains, or may contain:
    • Contaminated water
    • Sewage
    • Or other waste, liquid or gas of unknown or unsafe quality, 

The following are considered to be cross connections if through which, or because of which, backflow could occur:

  • Arrangements
  • Bypass
  • Four-way valve connections
  • Jumper connections
  • Removable spools
  • Swivel or changeover assembles
  • Other temporary or permanent assembles

For Testers

Backflow test results and renewal certifications for testers and gauges can be emailed or faxed to 719-687-5232.