Since 2005, the MSU Extension Well Educated program has provided water quality testing assistance to private well owners across Montana. Data from the program provides insights about what parameters (arsenic, nitrate, etc.) well owners may find in their groundwater in different parts of the state. Currently, data from the 2015 to 2019 program years has been currated into our database, which supports the information on this webpage. 

Testing Packages and Parameter Glossary: This page contains information on testing packages offered through the Well Educated Program and a glossary of water quality parameters.

Interactive Map

Click on your county in the to map below to view testing recommendations and parameters of concern in your area.

Statewide Parameters of Concern

MCL = Maximum Contaminant Level

All Parameters with Exceedances MCL Units
Arsenic 0.01 mg/L
Fluoride 4 mg/L
Nitrogen, Nitrate+Nitrite as N 10 mg/L
Selenium 0.05 mg/L
Uranium 0.03 mg/L
Lead* 0.015 mg/L
Copper* 1.3 mg/L
*Lead and copper typically come from plumbing fixtures rather than groundwater, however, corrosive groundwater can exacerbate the issue.