Kenosha County, Wisconsin: drinking water report. Kenosha County sits along Lake Michigan's western shore in southeastern Wisconsin, encompassing the
Kenosha County sits along Lake Michigan's western shore in southeastern Wisconsin, encompassing the cities of Kenosha, Pleasant Prairie, and Bristol, along with several smaller communities. The county's water supply draws primarily from Lake Michigan for municipal systems serving the more populated eastern areas, while rural western portions rely on groundwater wells tapping into shallow aquifers beneath the glacial till plains. This split between surface and groundwater sources creates distinct water quality challenges across the county's 19 ZIP codes.
Wisconsin's Lake Michigan intake systems face less agricultural contamination than inland communities, but industrial legacy concerns remain relevant in Kenosha County. The city of Kenosha's waterfront hosted manufacturing operations for over a century, and while municipal water treatment meets federal standards, the lake intake point sits in waters that received decades of industrial discharge. The Wisconsin Department of Natural Resources has documented historical contamination in harbor sediments, though treatment plants use conventional filtration and disinfection processes designed to address these concerns before water reaches households.
Lead exposure represents a more immediate risk for many Kenosha County residents. The county's older housing stock, particularly in the city of Kenosha where development peaked in the early-to-mid 1900s, contains thousands of lead service lines and interior plumbing with lead solder. Wisconsin's Lead and Copper Rule testing has identified elevated lead levels in some sample homes, though utilities are working through replacement programs. The challenge grows more complex in the county's rural areas, where private well owners lack the regulatory oversight that municipal systems receive. These homeowners bear sole responsibility for testing and treating their water.
The western half of Kenosha County faces agricultural water quality pressures common to southeastern Wisconsin. Nitrate contamination from fertilizer application affects shallow groundwater in farming communities, with some private wells exceeding the 10 mg/L federal standard. Per- and polyfluoroalkyl substances (PFAS) have been detected in Wisconsin groundwater with increasing frequency as testing expands, and Kenosha County's mixture of industrial history, fire training sites, and landfills creates multiple potential sources. The state's PFAS testing program is still building baseline data, but residents on private wells in areas near former or current industrial operations should consider testing as these "forever chemicals" do not break down naturally.
Municipal water customers should request lead testing if their home was built before 1986 and flush taps before drinking if water has sat unused for several hours. Private well owners need to test annually for bacteria and nitrates, with additional testing for PFAS if near potential contamination sources. Check your water to see current data for your specific address, review the water filter guide for treatment options matching your contaminants, access the detailed report for comprehensive testing information, and visit the Wisconsin state page for context on statewide water quality patterns.