Humboldt County, IA
drinking water quality

9,617 residents · 13 public water systems · 10 ZIP codes

Worst PFAS result on federal record
No PFAS above the federal limit

EPA sampled 1 of 13 public water systems here, together serving about 4,792 people. Last sampled 7/15/2025.

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 Humboldt 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 Humboldt County

50519 · 50520 · 50529 · 50545 · 50548 · 50558 · 50570 · 50577 · 50582 · 50591

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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