Vermilion County, Illinois: drinking water report. Vermilion County sits in east-central Illinois along the Indiana border, with Danville as its largest
Vermilion County sits in east-central Illinois along the Indiana border, with Danville as its largest city and county seat. The area also includes communities like Hoopeston, Georgetown, and Catlin. Most residents receive water from municipal systems that draw from the Vermilion River, Lake Vermilion, groundwater wells, or a combination of these sources, while rural areas often rely on private wells tapping into local aquifers.
Illinois has documented PFAS contamination in multiple counties, and Vermilion County's mix of agricultural land use, industrial history in Danville, and groundwater dependence creates several potential exposure pathways. The EPA's UCMR5 testing program required larger water systems across Illinois to test for 29 PFAS compounds between 2023 and 2025, though smaller utilities and private wells remain largely unmonitored. Agricultural runoff, legacy industrial sites, and wastewater treatment plants can all serve as PFAS sources in communities like those found throughout this county.
Lead remains a concern in older housing stock, particularly in Danville's pre-1986 neighborhoods where lead service lines and household plumbing may still exist. Illinois implemented stricter lead testing requirements following the federal Lead and Copper Rule Revisions, but sampling typically captures only a fraction of homes in any given system. Corrosion control treatment helps, but water chemistry changes or infrastructure work can temporarily elevate lead levels even in previously compliant systems. Private well owners face additional challenges since they're responsible for their own testing and treatment, and many go years without checking for contaminants.
Nitrate contamination from agricultural fertilizers affects groundwater across Illinois farming regions. Vermilion County's rural areas, where corn and soybean cultivation dominates the landscape, show the typical pattern of elevated nitrate risk in shallow wells. The EPA sets the maximum contaminant level at 10 mg/L, but even levels below that threshold may pose health concerns for infants and pregnant women. Atrazine and other herbicides also appear seasonally in surface water supplies, particularly during spring planting and heavy rainfall events that wash chemicals from fields into streams and reservoirs.
Testing your specific water supply matters more than county-level generalizations, since contamination varies dramatically between municipal systems, well depths, and neighborhoods. Check your water to see current data for your address, review the water filter guide to find systems certified for the contaminants you're concerned about, get a detailed report showing what's actually in your water, or visit the Illinois state page for broader context on statewide water quality patterns.