Warren County, IA
drinking water quality

56,343 residents · 14 public water systems · 12 ZIP codes

Worst PFAS result on federal record
PFAS detected, below the federal limit

EPA sampled 4 of 14 public water systems here, together serving about 54,432 people. The highest reading was PFHxS at 3.1 ng/L at Carlisle Water Supply. Last sampled 9/17/2024.

What was found

CompoundHighest resultFederal limitRatio
PFHxS3.1 ng/L10 ng/L0.3×

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 Warren 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 Warren County

50001 · 50047 · 50118 · 50125 · 50139 · 50145 · 50160 · 50166 · 50210 · 50211 · 50229 · 50241

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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