Is Dunwoody, GA tap water safe?
Data: U.S. EPA · How we read the data · How we check it
Summary
No federal limits exceeded in EPA data for DeKalb County Water System.
DeKalb County Water System supplies Dunwoody (743,000 people).
Water system
DeKalb County Water System
743,000 people · Surface water · EPA ID GA0890001
Buys treated water from Gwinnett County Dept. of Water Resources, City of Atlanta Department of Watershed Management.
| PFAS | Highest average | Limit |
|---|---|---|
| PFOA Not detected | – | 4 ppt |
| PFOS Not detected | – | 4 ppt |
| PFHxS Not detected | – | 10 ppt |
| PFNA Not detected | – | 10 ppt |
| HFPO-DA (GenX) Not detected | – | 10 ppt |
ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.
Lead: 5.5 ppb at the 90th percentile (Dec 2024, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 0
Across Georgia, 27 of 252 water systems EPA tested had PFAS above a 2024 federal limit, and 16 systems were above the lead action level in results from the last five years. Georgia results.
Dunwoody homes and lead pipes
Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. Renting? Ask your landlord what the service line is made of, because it's their pipe to replace. How to check your own line.
Housing: Census American Community Survey 2020–2024 5-year estimates for Dunwoody city (tables B25034, B25003). Estimates for small places have a margin of error.
How nearby cities compare
| City | PFAS | Lead (90th pct.) |
|---|---|---|
| Chamblee 4 mi DeKalb County Water System | None above limits | 5.5 ppb |
| Brookhaven 5 mi DeKalb County Water System | None above limits | 5.5 ppb |
| Roswell 7 mi Cobb County Water System | None above limits | – |
| Johns Creek 9 mi North Fulton County Water System | None above limits | 1.6 ppb |
| Tucker 9 mi DeKalb County Water System | None above limits | 5.5 ppb |
| Alpharetta 9 mi North Fulton County Water System | None above limits | 1.6 ppb |
Dunwoody ZIP codes (3)
- 30338
- 30346
- 30360
Questions
Is Dunwoody tap water safe to drink?
DeKalb County Water System has had no health-based violations since 2016. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.
Who supplies water in Dunwoody, GA?
DeKalb County Water System, which serves 743,000 people.
Does Dunwoody tap water have PFAS?
None detected above EPA's reporting limits. DeKalb County Water System had no PFAS detected in EPA's 2023–2025 testing. "Not detected" means below the reporting limit (about 2 to 20 ppt), not proven zero.
Do Dunwoody homes have lead pipes?
Census estimates put 44% of Dunwoody homes as built before 1980 (Georgia: 32%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. DeKalb County Water System's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.
Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.