Irrigation & Backflow Prevention

Annual certification of backflow prevention devices is required in Holly Springs. Residents who have a second water meter connected to the Town’s drinking water supply, commercial properties, and commercial fire lines are affected. Second water meters often are used for irrigation systems and pools because customers can avoid paying sewer fees for water flowing through the second meter. As an alternative, the irrigation meter may be disconnected.

For more information on device requirements or standards, permits, and inspections, contact the Department of Public Works at (919) 552-5920. 

The Town requires backflow prevention device testers to be certified by a state-recognized certification program.

The Town of Holly Springs does not endorse or recommend anyone on this list.

Getting a Residential Backflow Prevention Device Certified

  • A letter will be mailed to residents with backflow prevention devices 30 days before certification is due. 
  • Residents contact a certified plumber or certified backflow tester not affiliated with the town to complete the inspection. The tester will confirm the device is in working order and submit test results directly to Backflow Solutions Inc., which manages backflow prevention device data for the town. 
  • If a resident does not wish to have a backflow prevention device tested, a request can be made to have the second meter turned off to stop using water from that meter.

Test Submission

Backflow test reports are submitted directly to Backflow Solutions Inc. at

About Backflow Prevention Devices

Backflow prevention devices prevent drinking water contamination, which could occur, for example, if water from an irrigation system, pool or other use flows back into the town’s drinking water supply. The devices prevent cross connections between the Town’s water system and a private water system.

Backflow prevention devices use a system of check valves to prevent water and potential contaminants (for example, from the irrigation system or swimming pool) from being forced backward into the Town’s drinking water supply.

A break in a water line or a firefighting effort causing a loss of pressure in the town’s drinking water system could result in a backward flow of water. Backflow also could be caused by an increase of pressure in the resident’s system. Backflow prevention devices prevent water from flowing back into the town’s drinking water supply.

State law requires municipalities to create cross connection programs and to monitor which properties need backflow prevention devices and ensure the devices are being maintained. To ensure the continued quality of the Town’s drinking water supply and to comply with state law and the Federal Safe Drinking Water Act, Holly Springs requires residents and businesses that have water systems with the potential to contaminate the public drinking water supply to install backflow prevention devices. 

Backflow prevention devices have been required and cross connection control programs have been in place in Raleigh since 1985, in Durham since 1987, in Apex since 1993, and in Cary since 2003.