A backflow preventer keeps water from an irrigation system, boiler or other connection from flowing back into the drinking water supply. In Charlotte, most residential backflow questions come from irrigation systems, and Charlotte Water sets the rules for which assemblies are needed and who may test them.
Who needs backflow testing in Charlotte?
Does my irrigation system need a backflow preventer?
Yes. Charlotte Water's backflow guide lists irrigation among connections that need a device, and says irrigation systems installed since March 24, 2003 require a reduced pressure principle assembly (RP). Older systems with a double check valve assembly are grandfathered until that assembly needs replacing.
How often does a backflow preventer need testing?
Charlotte Water's guide says devices must be tested by a Charlotte Water approved and certified tester when installed and annually after that. North Carolina law has adjusted the schedule for some eligible residential irrigation systems that don't feed chemicals, so confirm your schedule with Charlotte Water's backflow office.
Failed tests and freeze damage
Assemblies fail when internal check valves or relief valves wear or foul with debris. Many can be rebuilt with a parts kit rather than replaced. Outdoor assemblies that are left full in winter can freeze and crack; drain or insulate them in fall, and have them tested when the system is turned back on in spring.
Hiring a plumber for this job: backflow testing in Charlotte
SteadWell is a free referral service, not a plumbing company. We connect you with an independent, licensed plumber who serves Charlotte; that plumber prices the job and stands behind the work.
- Confirm the North Carolina license with the State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors.
- Ask whether the tester is on Charlotte Water's approved list.
- Ask whether repair parts are included if the assembly fails.
