Kansas City metro: water quality. Kansas City straddles the Missouri-Kansas border, and so does its water supply.
Kansas City straddles the Missouri-Kansas border, and so does its water supply. KC Water on the Missouri side draws from the Missouri River, one of the longest rivers in North America and the primary drinking water source for communities across the Great Plains. Overland Park and other Johnson County suburbs on the Kansas side are served by WaterOne, which also draws from the Missouri and Kansas rivers. The metro's 2.2 million residents span two states, two sets of regulations, and multiple water providers.
The Missouri River carries sediment, agricultural chemicals, and municipal discharges from thousands of miles of upstream watershed. KC Water's treatment plants handle high turbidity loads that would overwhelm less heavy-duty systems.
PFAS monitoring in the KC metro has found detectable compounds in both Missouri and Kansas side water systems. The Kansas City metro does not have a major military AFFF contamination site within its immediate footprint, but the Missouri River collects inputs from military and industrial sources along its course.
Kansas has established recommended action levels for PFAS in drinking water, while Missouri has been slower to set state-specific standards. The regulatory asymmetry means a resident in Overland Park falls under different oversight than a resident in Kansas City, Missouri, even though both may be drinking water from the same river.
According to data from the Kansas Department of Health and Environment, WaterOne's supply has shown PFAS detections below the federal MCL but above detection limits in multiple sampling periods. Missouri's Department of Natural Resources has published similar findings for KC Water's Missouri River-sourced supply.
KC's river-sourced supply places it in the same category as other Missouri and Mississippi River cities – St. Louis, Memphis, New Orleans – that draw from major waterways carrying accumulated contamination from upstream. Compared to those peers, Kansas City faces moderate PFAS risk: less than communities near concentrated military or manufacturing sources, but more than cities with protected reservoir or mountain watershed supplies.
The two-state dynamic adds a layer of complexity that few other metros face. Water quality regulations, testing frequency, and public disclosure requirements differ between Missouri and Kansas, creating information gaps for residents trying to compare across the state line.
Visit our Missouri state page for data on the Missouri side.
Knowing which side of the state line you're on – and which utility serves you – is the starting point.
Check your water to identify your provider and see the latest monitoring data. If you want to compare KC Water versus WaterOne results side by side, our data can help you do that. For filtering advice, our water filter guide addresses both PFAS and the high-sediment conditions common in Missouri River-sourced systems. A detailed report tracks how your area's readings have changed over time.