Alcorn County, MS
drinking water quality
34,228 residents · 8 public water systems · 3 ZIP codes
EPA sampled 4 of 8 public water systems here, together serving about 33,211 people. The highest reading was PFOS at 10.6 ng/L at City Of Corinth. 1 of the sampled system was above a federal limit. Last sampled 9/22/2025.
What was found
| Compound | Highest result | Federal limit | Ratio |
|---|---|---|---|
| PFOS | 10.6 ng/L | 4 ng/L | 2.6× |
| PFOA | 8.7 ng/L | 4 ng/L | 2.2× |
Also detected, with no federal limit set: lithium (263000 ng/L), PFBA (10 ng/L), PFBS (4.3 ng/L), PFHxA (3.6 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 Alcorn County
38834 · 38846 · 38865
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.