Carbonate aquifers form important regional sources of drinking water in eastern and southern Wisconsin. Previous work in Door County suggests that vertical fractures as well as horizontal partings and dissolution zones provide the primary pathways for groundwater flow

Inorganic arsenic is a well-known human poison that causes a wide array of adverse health effects. The World Health Organization and U.S. Environmental Protection Agency classify inorganic arsenic as a human carcinogen.

Benzene, toluene, ethylbenzene and xylenes (BTEX) are among the groundwater contaminants of greatest concern because of their toxicity, their solubility in water, and their resistance to degradation in anaerobic environments.

The primary goal of this study was to obtain the percentage of wells impacted by contaminants based on three indicators studied by the Environmental Protection Agency (EPA) as tools to identify fecal contamination in groundwater.

Recent studies monitoring ground water for enteric viruses have focused on municipal wells, whereas the incidence of viruses in private household wells is unknown.

The Token Creek watershed is an important contributor of water to the Yahara River and the Madison chain of lakes. Much of the baseflow for Token Creek comes from springs.