Is chromium-6 a problem in Wisconsin drinking water?

Chromium-6 was detected above the EPA limit of 100 ppb (total chromium MCL) in 5 ZIP codes across Wisconsin. Check the table above for specific areas. Consider Reverse Osmosis or Strong-Base Anion Exchange if your ZIP is affected.

How widespread is chromium-6 in Wisconsin water?

No chromium-6 detections were reported in Wisconsin in current EPA data. Monitoring data is updated periodically.

Chromium-6 · Wisconsin

Chromium-6 in Wisconsin Drinking Water — 5 Violations

EPA data analysis for chromium-6 in Wisconsin drinking water systems

ZipCheckup tracks Chromium-6 in Wisconsin drinking water: 0 ZIP codes with detected levels on record. 5 ZIP codes exceed the EPA limit (100 ppb (total chromium MCL)). Chromium-6 carries a high health-risk designation.

ZIPs with Violations

0.6%

Violation Rate

100 ppb (total chromium MCL)

EPA Limit

High

Health Risk

Reverse Osmosis or Strong-Base Anion Exchange

Best Filter Method

Chromium-6 Contamination in Wisconsin

ZipCheckup analyzed EPA enforcement records across 898 ZIP codes in Wisconsin. 5 ZIP codes have chromium-6-related violations on record.

The violation rate for chromium-6 in Wisconsin is 0.6% of all ZIP codes — lower than the national average.

EPA Standard for Chromium-6

The EPA maximum contaminant level (MCL) for chromium-6 is 100 ppb (total chromium MCL), governed by the National Primary Drinking Water Regulations. Water systems that exceed this limit must take corrective action and notify consumers.

Health Effects of Chromium-6

How to Remove Chromium-6 From Drinking Water

The most effective treatment for chromium-6 removal is Reverse Osmosis or Strong-Base Anion Exchange. Look for filters certified under NSF 58 standards.

Check Your ZIP Code

Use the ZipCheckup water quality search to see chromium-6 data for your specific water system in Wisconsin.

Cities with Chromium-6 Data in Wisconsin

3 cities in Wisconsin have chromium-6 testing data available.

De Forest Madison Sun Prairie

Wisconsin Water Quality Overview: See statewide water quality rankings on the Wisconsin water quality page.

Learn more about Chromium-6: Read the full guide on Chromium-6 in drinking water.

Home → Contaminants → Chromium-6 → Wisconsin

How to cite this page

APA

ZipCheckup. (2026). Chromium-6 in Wisconsin Drinking Water — 5 Violations. https://zipcheckup.com/contaminants/chromium-6/wisconsin/

BibTeX

@misc{zipcheckup-contaminants-chromium-6-wisconsin,
  author = {{ZipCheckup}},
  title  = {{Chromium-6 in Wisconsin Drinking Water — 5 Violations}},
  year   = {2026},
  url    = {https://zipcheckup.com/contaminants/chromium-6/wisconsin/}
}

Data as of July 2026.