Click on a county to see county-level information about:
Click each of the three different map layers to turn them on or off.
The individual well points are not interactive.
The eight counties shaded darker gray tested at most 10 wells for nitrate or bacteria between 2002 and 2017. This incredibly low amount of testing does not allow anyone to grasp the true scope of the contamination problems in these counties. All other counties are shaded lighter gray, and tested more than 10 wells.
To find out more about the map, click here.
Data for this map was gathered using the Iowa Department of Natural Resources’ Private Well Tracking System.