Rock County, MN
drinking water quality

9,525 residents · 8 public water systems · 11 ZIP codes

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

EPA sampled 1 of 8 public water systems here, together serving about 4,946 people. Last sampled 5/13/2025.

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 Rock 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 Rock County

56116 · 56134 · 56138 · 56144 · 56146 · 56147 · 56156 · 56158 · 56173 · 57030 · 57068

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

Other Minnesota counties

Anoka CountyCarver CountyDakota CountyHennepin CountyOlmsted CountyRamsey CountyScott CountySherburne CountySt. Louis CountyStearns CountyWashington CountyWright County

See every Minnesota county, ranked by what was found