DeKalb County, GA
drinking water quality
770,307 residents · 2 public water systems · 29 ZIP codes
EPA sampled 2 of 2 public water systems here, together serving about 1,832,893 people. EPA detected PFBA at 8.3 ng/L. EPA has not set a drinking water limit for PFBA, so there is no figure to compare it against. Last sampled 9/16/2025.
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 DeKalb County
30002 · 30021 · 30030 · 30032 · 30033 · 30034 · 30035 · 30038 · 30058 · 30072 · 30079 · 30083 · 30084 · 30087 · 30088 · 30288 · 30294 · 30307 · 30316 · 30317 · 30319 · 30322 · 30329 · 30338 · 30340 · 30341 · 30345 · 30346 · 30360
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.