Whitman County, WA
drinking water quality

48,399 residents · 34 public water systems · 20 ZIP codes

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

EPA sampled 3 of 34 public water systems here, together serving about 56,328 people. Last sampled 9/20/2023.

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 Whitman 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 Whitman County

99017 · 99033 · 99102 · 99111 · 99113 · 99125 · 99128 · 99130 · 99136 · 99143 · 99149 · 99158 · 99161 · 99163 · 99170 · 99171 · 99174 · 99176 · 99179 · 99333

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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See every Washington county, ranked by what was found