Rex is unincorporated, so Clayton County issues plumbing permits there, and the Clayton County Water Authority supplies water and sewer and tests backflow devices at customer connections itself. Call the number on this page to be connected with a local plumber in Rex.

Who issues permits for a business in Rex?
Clayton County. Rex was incorporated as a town in 1912 but its charter was repealed in 1922, so it has no city government today. The county's Community Development building permit section issues building, mechanical, electrical and plumbing permits for residential and commercial remodels, repairs and new construction. Its office is at 121 South McDonough Street in Jonesboro, and the phone is 770-477-3569.
How does backflow testing work here?
The Clayton County Water Authority provides water, sewer and stormwater service across the county, including Rex. CCWA installs backflow devices at all customer connections, and its own state-certified specialists test each device every year, scheduled around meter reading, and repair it as needed. Non-residential accounts pay a monthly per-connection fee for that service. A business in Rex doesn't need to hire its own tester for the CCWA device. That's quite different from neighboring DeKalb and Henry counties, so don't assume a contractor's quote for a yearly test applies here.
Which part of the water line belongs to the business?
CCWA's service line runs from the main to the meter. From the meter to the building, the line is owned by the customer. CCWA has finished a service line material inventory and runs a public portal where owners can look up their property. For large leaks or sewer backups after hours, call CCWA at 770-960-5200. Most local buildings are fairly recent; Rex's median home dates to 1995 and about a fifth predate 1980.
A short local note
Rex is centered on the historic Rex Mill and Rex Village, with small businesses spread along GA-42 and Rex Road. Older buildings near the village may have pipe that has been patched over the years, while newer strip buildings mostly have plastic drains and modern fixtures. Either way, find the main shutoff before you need it, and tell the plumber your hours so the work can fit around them.
When you call, you'll be connected with an independent local plumber who takes commercial jobs in Rex. Describe the business, which fixtures are affected and when the space can be closed. If the work needs a permit, the plumber will file it with Clayton County rather than a city office, which is worth confirming on the quote.
Commercial Plumbing questions in Rex
Which office issues the permit for commercial plumbing work?
Who tests a commercial backflow assembly, and how often?
Where does the utility's part of the water line end?
What should employees do if they smell gas at work?
More plumbing services in Rex
Commercial Plumbing nearby
Helpful guides
Sources
- Clayton County Community and Economic Development: Building Permits
- Clayton County Water Authority: Backflow Prevention
- Clayton County Water Authority: Who We Are
- Clayton County Water Authority: Water Service Line Inventory
- Clayton County Water Authority: Contact Us
- Atlanta Gas Light: Our Service Area
- Rex housing by year built (ACS 2019-2023, via Point2Homes)
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