Cherokee County, GA
drinking water quality
293,513 residents · 10 public water systems · 7 ZIP codes
EPA sampled 4 of 10 public water systems here, together serving about 263,014 people. The highest reading was PFOA at 6.8 ng/L at Woodstock. 1 of the sampled system was above a federal limit. Last sampled 9/29/2025.
What was found
| Compound | Highest result | Federal limit | Ratio |
|---|---|---|---|
| PFOA | 6.8 ng/L | 4 ng/L | 1.7× |
| PFOS | 5.3 ng/L | 4 ng/L | 1.3× |
| PFHxS | 4 ng/L | 10 ng/L | 0.4× |
Also detected, with no federal limit set: PFBS (7.4 ng/L), PFPeA (5.1 ng/L), PFHxA (4.7 ng/L).
What this means
PFAS are industrial chemicals that EPA describes as breaking down only very slowly in the environment. In April 2024 EPA set the first enforceable national limits: 4 ng/L for PFOA and PFOS, 10 ng/L for PFHxS, PFNA and GenX.
These figures are county-level and come from EPA’s sampling of public water systems. They describe the worst result found in the county, not what comes out of any particular tap — that depends on which system serves the address, and on the plumbing in the building. A private well is not covered by this programme at all.
ZIP codes in Cherokee County
30102 · 30107 · 30114 · 30115 · 30183 · 30188 · 30189
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.