Clinton County, Iowa: drinking water report. Clinton County sits along the Mississippi River in eastern Iowa, with cities including Clinton, Camanche,…
Clinton County sits along the Mississippi River in eastern Iowa, with cities including Clinton, Camanche, DeWitt, and Low Moor drawing water from both the river and underground aquifers. The county's water systems serve roughly 47,000 residents through a mix of municipal utilities that rely on Mississippi River surface water treatment and smaller communities using groundwater wells. This dual-source geography creates different contamination profiles depending on whether your tap water comes from the river or from deep wells beneath agricultural land.
Surface water utilities drawing from the Mississippi River face the typical challenges of large midwestern waterways: agricultural runoff carrying nitrates and herbicides, plus industrial legacy pollution from decades of manufacturing along the riverbanks. Clinton's main water treatment plant processes Mississippi River water and must contend with seasonal spikes in atrazine and other pesticides during spring planting and post-application rainfall. The EPA's Unregulated Contaminant Monitoring Rule (UCMR5) testing has flagged PFAS compounds in numerous Iowa river systems, and communities using surface water in eastern Iowa have detected these forever chemicals at levels warranting attention, though not always exceeding federal health advisory levels.
Groundwater-dependent systems in Clinton County's smaller towns face different concerns. The Cambrian-Ordovician aquifer that supplies many rural Iowa communities shows vulnerability to nitrate contamination from decades of fertilizer application on row crop agriculture. Iowa has some of the highest agricultural nitrate levels in the nation, and while municipal wells typically remain below the 10 mg/L maximum contaminant level through blending and source water management, private wells in farming areas often exceed safe drinking water standards. Lead service lines remain a concern in older housing stock in Clinton and other pre-1950s developments, though the county's utilities have been working through Iowa's lead service line inventory requirements.
The county's location downstream from multiple states means Clinton County residents drinking Mississippi River water also inherit upstream pollution. Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) detections in Iowa's eastern river communities reflect both local sources like wastewater treatment plants and firefighting foam use at regional airports, as well as contamination traveling hundreds of miles downstream. Testing data from Iowa utilities using river water shows these compounds appearing intermittently, and while treatment upgrades have helped, granular activated carbon systems are not universal across all county water providers.
Request your utility's latest Consumer Confidence Report to see which contaminants were detected in your specific system, and note whether your water comes from the Mississippi or from wells, since contamination patterns differ significantly. Given the agricultural landscape and river pollution legacy, Clinton County households may benefit from point-of-use filtration for PFAS, nitrates, and seasonal pesticide spikes. Check your water for current data on your specific address, review our water filter guide to match filtration technology to your contamination profile, read the detailed report for full county testing data, and see the Iowa state page for broader context on agricultural runoff and river water quality issues.