St Joseph County, Indiana: drinking water report. St. Joseph County is home to South Bend and about 272,000 residents in northern Indiana.
St. Joseph County is home to South Bend and about 272,000 residents in northern Indiana. The county draws water from the St. Joseph River and groundwater from glacial aquifers. Indiana American Water and the City of South Bend operate the main distribution systems. The county's industrial heritage – automotive parts, aerospace manufacturing, and metalworking – left a mark on both soil and groundwater throughout the urbanized corridor.
The former Studebaker manufacturing complex and multiple metalworking operations contributed chlorinated solvent contamination to South Bend's groundwater. According to Indiana DEM's 2024 site investigation reports, TCE plumes from three separate industrial sites intersect in the central part of the county. South Bend's switch to river water reduced direct exposure from these plumes, but private well users in the affected zones remain at risk.
The EPA's UCMR5 data also flagged PFAS in St. Joseph County's water supply. South Bend International Airport's use of AFFF is the suspected primary source. A 2024 IDEM investigation found PFAS at 18 ppt combined in monitoring wells near the airport – above the federal cumulative hazard index threshold.
South Bend's water treatment handles most regulated contaminants, but the industrial legacy in the county means groundwater users face a different risk profile. If you are on a private well anywhere near the airport or former manufacturing sites, testing is essential.
Check your water for current data at your address. For the mix of solvents and PFAS found in this area, reverse osmosis is the most effective single-system solution. Our water filter guide ranks options by independent test results. Get your detailed report for historical context, and visit our Indiana page for statewide data.