a splash of water

Cross-Connection Control & Backflow Prevention Program

Thornton has implemented an operational backflow and cross-connection control program. A cross-connection control program is important because controlling cross-connections and preventing backflow is critical to ensuring the safety of the drinking water we provide to our residents. 

It’s up to all of us to ensure that all backflow prevention assemblies within the water distribution system are tested and maintained annually.

Facility Owners: See Important Information to right for testing and inspection information.

What is a Cross Connection?

Cross Connection.jpgA cross-connection is a direct arrangement of a piping line that allows the potable water supply to be connected to a line that contains a contaminant. An example is the common garden hose attached to a sill cock with the end of the hose lying in a cesspool. Other examples are a garden hose attached to a service sink with the end of the hose submerged in a tub full of detergent, supply lines connected to bottom-fed tanks, supply lines connected to boilers.

What is Backflow?

Backflow is unwanted flow of water in the reverse direction. Back pressure and back siphonage are the two types of backflow.

backflow backsiphonage.jpg

Annual Inspections

The city looks for potential risks to the water distribution system via annual inspection of all commercial, industrial, and non-single family residences (townhomes and apartments) properties. If the plumbing system inside of your building were built to code, these risks will be well-managed. However, older buildings may need to be brought up to current plumbing requirements.

Additionally, all commercial, industrial, and non-single family residences (townhomes and apartments) are required to have approved backflow device installed and tested annually to stay in compliance with the city’s Cross-Connection Control & Backflow Prevention Program.

Backflow preventers or cross-connection devices are required by Thornton city ordinance 74-156. Operational tests by a Certified Backflow Technician must be conducted on all required backflow prevention assemblies at installation and at least annually thereafter. Test results must be submitted online at Backflow Solutions, Inc. prior to the annual test due date.

Testing Companies

Many backflow testing companies serve Thornton. The city of Thornton does not recommend any testing company over another. Please contact us for further information regarding the testing process or requirements.

Annual Inspections
Important Information