Clayton County, GA
drinking water quality
297,703 residents · 3 public water systems · 8 ZIP codes
EPA sampled 1 of 3 public water systems here, together serving about 298,374 people. The highest reading was PFOS at 8.5 ng/L at Clayton County Water Authority. 1 of the sampled system was above a federal limit. Last sampled 8/9/2023.
What was found
| Compound | Highest result | Federal limit | Ratio |
|---|---|---|---|
| PFOS | 8.5 ng/L | 4 ng/L | 2.1× |
| PFOA | 8.4 ng/L | 4 ng/L | 2.1× |
| PFHxS | 6.6 ng/L | 10 ng/L | 0.7× |
Also detected, with no federal limit set: PFPeA (18 ng/L), PFHxA (16 ng/L), PFBA (6.8 ng/L), PFBS (6.5 ng/L), PFHpA (5.5 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 Clayton County
30236 · 30238 · 30250 · 30260 · 30273 · 30274 · 30296 · 30297
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.