Loudon County, TN
drinking water quality
62,129 residents · 4 public water systems · 5 ZIP codes
EPA sampled 3 of 4 public water systems here, together serving about 64,703 people. The highest reading was PFOS at 4.6 ng/L at Lenoir City Utility Board. 1 of the sampled system was above a federal limit. Last sampled 9/10/2024.
What was found
| Compound | Highest result | Federal limit | Ratio |
|---|---|---|---|
| PFOS | 4.6 ng/L | 4 ng/L | 1.1× |
Also detected, with no federal limit set: PFBS (6.2 ng/L), PFHxA (4.6 ng/L), PFPeA (3.2 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 Loudon County
37742 · 37771 · 37772 · 37774 · 37846
Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.