• EPA drinking water standards
  • Map of hardness
  • Madison well water quality - major ions and other parameters
  • Madison water utility reports on water quality
  • USGS Trace Element Projects
  • US counties with high arsenic in groundwater
  • Arsenic in Wisconsin GW
  • Radon detections in wells in a portion of Wisconsin
  • USGS Circular on Nutrients and Pesticides
  • Nitrate exceedances for wells in Wisconsin
  • Pesticide detections in wells in a portion of Wisconsin
  • DNR LUST (and other contaminated) site database
  • EPA fact sheet on MTBE
  • USGS fact sheet on MTBE and VOCs
  • VOC exceedances for wells in Wisconsin
  • Superfund Program
  • Location of Superfund sites in Wisconsin