Holly Springs doesn't run a water department; the Cherokee County Water & Sewerage Authority serves the city, and its Backflow Department takes test reports from testers and master plumbers through an online portal. The authority's page doesn't state how often testing is due, so confirm that with CCWSA. Call the number on this page to be connected with a local plumber in Holly Springs.

Who handles backflow for Holly Springs homes?
The Cherokee County Water & Sewerage Authority. The City of Holly Springs runs no water department, and its own rezoning application asks for a water and sewer availability letter from CCWSA. That makes the authority's Backflow Department the office whose rules apply to your connection. Backflow testers and master plumbers submit device test reports electronically through CCWSA's Backflow Prevention Test Portal, using a login issued by the department. Questions go to the Backflow Department at 770-479-9107.
How often does the device need a test?
CCWSA's backflow page doesn't state a testing interval, so we won't guess at one. If you've received a reminder, it will say when the test is due. If you haven't, call the Backflow Department and ask whether your account has a device on record, how often it must be tested and whether the authority accepts reports from any tester with a portal login. A plumber who does backflow work can also tell you what kind of device you have and what it protects.
Which homes here are most likely to have one?
Holly Springs is one of the fastest-growing suburbs on I-575, between Woodstock and Canton, and most of its homes were built after 2000; the median dates to 2009. New subdivisions around Hickory Flat, Sixes and Toonigh frequently come with in-ground irrigation from the builder, and an irrigation line is the connection most likely to need backflow protection. A sprinkler line runs through soil, fertilizer and standing water, and a drop in main pressure could pull that water back toward the house without a device to stop it. Homes without irrigation, a pool fill or a business connection are less likely to have a testable device at all.
If your device fails or leaks, the usual fix is a rebuild of the checks and seals, followed by a retest. A body cracked by a freeze means replacement. Work that adds or moves piping is inspected by the city's building official, and the city's Building Inspections page points to its Cloudpermit online permitting portal; City Hall is at 770-345-5536.
A local note
Newer homes often have the device tucked into a meter-side box that fills with mulch and pine straw. Before the plumber arrives, clear the lid, note the device's make and size, and find any paperwork the builder left about it. If it's spraying, close the irrigation valve and leave the house supply on.
Backflow Testing questions in Holly Springs
How do test results get to the water utility?
How often does a backflow assembly need testing here?
I just bought a house with irrigation. What should I do about backflow?
How do I keep an outdoor backflow assembly from freezing?
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