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What Tests Should be Run on Private Wells?

Well Construction Information

Instructions for Collecting a Water Sample

Certified Laboratories for Water Testing (WDNR)

Coliform Bacteria

Coliform bacteria are one of the most common problems in Wisconsin's private wells.  As many as 25% of the private well samples tested annually are unsafe because of the presence of coliform bacteria.

Nitrate Nitrogen

Nitrate nitrogen (commonly referred to as nitrate) is one of the most common chemicals found in Wisconsin groundwater.  Approximately 12% of private wells in the state exceed the drinking water limit of 10 milligrams per liter (mg/L, also called parts per million or ppm) for nitrate nitrogen.

Water Softening

Arsenic

For the most up to date information on arsenic in drinking water visit the Wisconsin DNR arsenic page.

Other Useful Extension Bulletins on Drinking Water Issues