Henry County, Illinois: drinking water report. Henry County sits in northwestern Illinois along the Illinois and Rock rivers, with Kewanee as its largest…
Henry County sits in northwestern Illinois along the Illinois and Rock rivers, with Kewanee as its largest city and Geneseo, Cambridge, and Galva among its other communities. Most residents rely on municipal systems drawing from groundwater aquifers or river sources, though rural areas often use private wells tapping into the region's agricultural groundwater. The county's position in prime farming territory means water systems face the pressures common to agricultural regions across Illinois.
Illinois agricultural counties like Henry face persistent challenges with nitrate contamination from fertilizer runoff and tile drainage systems that channel field chemicals into groundwater. The state's monitoring data shows that shallow aquifers in farming regions regularly approach or exceed the EPA's 10 mg/L nitrate limit, particularly during spring planting and after heavy rains. Private well owners in Henry County bear the highest risk since these systems lack the treatment infrastructure that municipal utilities provide.
Lead exposure remains a concern in the county's older towns where service lines and household plumbing installed before the 1986 lead ban still deliver water to homes. Kewanee, Geneseo, and Cambridge all have housing stock dating to periods when lead pipes were standard, and Illinois utilities participating in the Lead and Copper Rule testing have documented elevated readings in first-draw samples across similar communities. The state's accelerated lead service line replacement program targets these older systems, but progress varies widely by utility budget and local prioritization.
PFAS contamination represents an emerging issue that Illinois is only beginning to map comprehensively. The EPA's UCMR5 testing between 2023 and 2025 has detected these "forever chemicals" in water systems statewide, including small and medium utilities serving rural areas. Industrial operations, wastewater treatment plants, and historical use of firefighting foam at airports all contribute potential PFAS sources. Henry County's municipal systems likely underwent this federal testing, though results for specific utilities may not yet be public. Agricultural pesticides including atrazine also show up regularly in Illinois surface water monitoring, affecting systems that draw from the Rock or Illinois rivers.
If you get water from a private well, annual testing for nitrates, bacteria, and lead provides essential baseline data that no regulatory agency will collect for you. Municipal customers should request their utility's latest Consumer Confidence Report and ask specifically about lead service line inventories and PFAS testing results. Check your water for current data on your specific address, review our water filter guide for treatment options that match your contamination concerns, download a detailed report showing what's in your water, and visit the Illinois state page for context on statewide patterns and regulations affecting your drinking water.