Marshall County, TN
drinking water quality
37,847 residents · 4 public water systems · 4 ZIP codes
EPA sampled 2 of 4 public water systems here, together serving about 37,826 people. The highest reading was PFOA at 11 ng/L at Marshall Co B.p.u. #1. 2 of the sampled systems were above a federal limit. Last sampled 9/28/2023.
What was found
| Compound | Highest result | Federal limit | Ratio |
|---|---|---|---|
| PFOA | 11 ng/L | 4 ng/L | 2.8× |
| PFOS | 5 ng/L | 4 ng/L | 1.3× |
Also detected, with no federal limit set: PFBS (34 ng/L), PFHxA (27 ng/L), PFPeA (20 ng/L), PFBA (13 ng/L), PFHpA (3.8 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 Marshall County
37019 · 37034 · 37047 · 37091
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.