Backflow Program

Backflow Program

** Beginning in January 2023, Mooresville will no longer accept hard copy of emailed backflow inspection reports from certified testers.  Contractors wanting to submit a backflow certification report on behalf of a customer should contact Angie Boliek, Backflow Coordinator to set up an account in the new on-line portal.  Customers may also set up accounts to view past backflow certification reports and future due dates. **

Cross-Connection Control & Backflow Prevention
A cross-connection is any physical connection between the public water system and a potential source of non-potable, polluted, or contaminated water or substances that can then enter into the safe drinking public water system.  Below are a few examples of possible cross-connections: 

  • Lawn irrigation sprinkler heads that are below ground level.  Water which may have been in contact with chemicals, pesticides, or animal/bird droppings can be back-siphoned through a leaky valve into the potable water system.
  • Soapy water or other cleaning compounds can be back-siphoned into your water supply plumbing through a faucet or hose submerged in a bucket or laundry basin.
  • A hose submerged in a swimming pool creates a pathway for pool water to be back-siphoned into your water supply plumbing.
  • Fertilizers/pesticides can be back-siphoned into your water supply plumbing through a garden hose attached to aa fertilizer/pesticide sprayer.

 Water systems depend on pressure in the distribution pipes to keep water flowing in the proper direction.  However, anything causing a drop in water pressure can reverse flow of water or other substances (like detergents or fertilizers) from a customer’s plumbing system back into the public water system, creating a health hazard for anyone connected to the system.  This is called backflow. 

North Carolina General Statutes require backflow prevention assemblies be installed on all cross-connections to help keep our water supply safe.  
This includes most commercial water customers as well as residential in-ground irrigation customers or customers who have a pool with auto-fill capabilities.  These devices must be permitted through the Town of Mooresville Public Utilities Department, and tested and certified every year to ensure they are working properly, in accordance with State law.

For more information or to ask if your project may require a backflow prevention assembly, you can contact the Town’s Backflow Coordinator at, or 704-799-8995.

Backflow Prevention Service Application (PDF)
Fire Service Connection (PDF)
Principle Assembly 2" and Under (PDF)
Principle Assembly 3" and Up (PDF)

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