Tests for Drinking Water from Private Wells
Ask an expert!
List of certified water testing labs for coliform bacteria and nitrate testing
Locate a certified water testing laboratory for other contaminants of concern
How to request a well constructor's report
If you have a WUWN you can search online here.
Search using DATCPs mapping tool
Better Homes and Groundwater
Maintaining your home well water system
Arsenic is a naturally occurring element found in soil and rock and under certain conditions can be released into groundwater and enter wells. Elevated levels of arsenic have been found in a number of wells throughout the state with the majority of these being reported in northeastern Wisconsin. Because arsenic is a known carcinogen, the State of Wisconsin has recently lowered the allowable level of arsenic in drinking water to 10 micrograms per liter (ug/L, also called parts per billion or ppb).
For the most up to date information on arsenic in drinking water visit the Wisconsin DNR arsenic page.
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.
Increased levels of copper in drinking water is caused by corrosive water and the dissolution of copper plumbing. Levels of copper in drinking water greater than 1.3 milligrams per liter (mg/L, also called parts per million or ppm) may cause digestive problems.
Hard water is caused when water comes in contact with rocks such as limestone and dolomite which contain calcium and magnesium. While hard water is not a health concern, excessive amounts of water hardness can cause lime or scale build-up in pipes and reduce the effectiveness or life of your plumbing. Water softeners are a common and effective treatment device for homes with water hardness problems.