Jefferson County, IL
drinking water quality
36,107 residents · 16 public water systems · 12 ZIP codes
EPA sampled 3 of 16 public water systems here, together serving about 24,863 people. EPA detected PFBA at 9.9 ng/L. EPA has not set a drinking water limit for PFBA, so there is no figure to compare it against. Last sampled 9/26/2023.
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 Jefferson County
62810 · 62814 · 62816 · 62830 · 62846 · 62864 · 62872 · 62883 · 62889 · 62893 · 62894 · 62898
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.