Knox County, TN
drinking water quality

506,748 residents · 9 public water systems · 23 ZIP codes

Worst PFAS result on federal record
PFAS detected, no federal limit set

EPA sampled 6 of 9 public water systems here, together serving about 601,594 people. EPA detected PFBS at 6.4 ng/L. EPA has not set a drinking water limit for PFBS, so there is no figure to compare it against. Last sampled 9/18/2023.

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.

Request a test of your own supply.

This is Knox County's worst federal result, not a reading from your tap. Leave a number and a local water specialist will test it.

No obligation. Your details go to a local water specialist to arrange the test, and to no one else.

ZIP codes in Knox County

37721 · 37806 · 37849 · 37871 · 37902 · 37909 · 37912 · 37914 · 37915 · 37916 · 37917 · 37918 · 37919 · 37920 · 37921 · 37922 · 37923 · 37924 · 37929 · 37931 · 37932 · 37934 · 37938

Readings are county-level, so every ZIP here shares the figure above. Search your ZIP on the map to see it in context.

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