Your county health department
Wisconsin doesn't run a statewide free testing program that we know of. Some county health departments test wells or sell kits, so call yours first.
Wisconsin's private well pageUranium in Wisconsin well water, by county
Uranium is worth checking in 1 of the 6 Wisconsin counties with 10 or more tested wells, and rare in the rest. A county's share tells you how likely a problem is nearby. Only a test of your own well tells you what's in it.
How Wisconsin compares with the rest of the country
Across Wisconsin, 1 of 197 tested wells had uranium over the EPA limit of 30 µg/L (1 of 197). Across all tested wells in the US it's about 1 in 22. That's less often than in the country as a whole. Counties still differ, so check yours below.
Why it matters: Drinking it for years can harm your kidneys and raises the risk of cancer.
Uranium comes out of the rock and sediment the wells draw from.
Uranium in tested wells, county by county
Share of each county's tested wells with at least one result over the EPA limit of 30 µg/L. Counties need 10 or more tested wells to be listed. Widespread means 15% or more, worth checking 5 to 15%, rare under 5%.
| County | Wells tested | Wells over the limit | Level |
|---|---|---|---|
| Shawano County | 13 | Worth checking | |
| Portage County | 32 | Rare | |
| Waukesha County | 16 | Rare | |
| Waupaca County | 15 | Rare | |
| Waushara County | 13 | Rare | |
| Marquette County | 10 | Rare |
37 more Wisconsin counties have 1 to 9 tested wells for uranium, too few to rate.
Download this table (CSV) · Free to reuse under CC BY 4.0
Where to get your well tested for uranium in Wisconsin
A lab Wisconsin certifies
Ask for uranium by name. Results from a certified lab count for a home sale or a loan.
Labs certified by WisconsinA mail-in kit
Fill the bottles at your kitchen tap and mail them back. We mark the kits that include uranium.
Compare kitsKeep reading about wells in Wisconsin
- Well water testing in Wisconsin: how to get tested and what turns up statewide
- Uranium in well water: where it comes from, what it does and how to remove it
- Nitrate in Wisconsin wells, by county
- Arsenic in Wisconsin wells, by county
- Manganese in Wisconsin wells, by county
- Lead in Wisconsin wells, by county
Questions people ask about uranium in Wisconsin
Is there uranium in Wisconsin well water?
Uranium is worth checking in 1 of the 6 Wisconsin counties with 10 or more tested wells, and rare in the rest. Across Wisconsin, 1 of 197 tested wells had uranium over the EPA limit of 30 µg/L (1 of 197). Across all tested wells in the US it's about 1 in 22. That's less often than in the country as a whole. Counties still differ, so check yours below.
Where can I get my well tested for uranium in Wisconsin?
Use a lab certified by Wisconsin for drinking water, or a mail-in kit that includes uranium from a certified lab. Some county health departments test wells too, so call yours first.
See Wisconsin's list of certified labs, or compare mail-in kits.
Where these numbers come from
- Lab tests: Water Quality Portal (USGS and EPA), well samples since 2000. A well counts as over if any of its tests was over the EPA limit of 30 µg/L. Wells tested for studies and monitoring, not a random sample of homes.
- Likely overstated: our own check of who tested the wells, when and where. How we check.
- State programs and links: Department of Natural Resources (DNR).