Free Kansas water report: PFAS & lead levels for every water system, worst-affected cities, and EPA violations. Check your ZIP.
Kansas serves approximately 2.9 million residents through municipal water systems, rural water districts, and private wells spread across a state that stretches from the humid eastern tallgrass prairie to the semi-arid western High Plains. Water sources vary accordingly: eastern Kansas communities draw from rivers, reservoirs, and alluvial aquifers fed by adequate rainfall, while western Kansas depends heavily on the Ogallala Aquifer – the massive underground formation that stretches from South Dakota to Texas and supplies roughly 30% of the nation's irrigation water. The Kansas Department of Health and Environment (KDHE) oversees about 900 public water systems. Wichita, the largest city at roughly 400,000 people, uses a combination of Cheney Reservoir surface water and the Equus Beds Aquifer, supplemented by an aquifer recharge project that injects treated surface water back underground to maintain storage levels.
The split between eastern and western Kansas is not just geographic – it determines what contaminants residents are most likely to encounter. Eastern systems face agricultural runoff, legacy industrial contamination, and reservoir sedimentation. Western systems face declining aquifer levels, naturally occurring minerals, and agricultural chemical residues concentrated by decades of irrigation return flow.
PFAS monitoring in Kansas has centered on military installations, and the data from those sites is concerning. McConnell Air Force Base in Wichita is the state's highest-profile PFAS contamination site. AFFF used in decades of firefighting training exercises has contaminated groundwater in the surrounding area, with PFOA and PFOS detected at levels well above EPA health advisory limits in some monitoring wells. The Department of Defense has conducted extensive sampling around the base and is providing alternative water supplies to affected residents.
Beyond McConnell, Kansas has not yet conducted comprehensive statewide PFAS monitoring. The EPA's UCMR5 program is filling some of that gap for larger public water systems, but smaller systems and private wells remain largely uncharacterized. KDHE has not adopted state-specific PFAS MCLs, relying on federal standards.
The Ogallala Aquifer, which supplies much of western Kansas, has not been systematically tested for PFAS. While the aquifer's depth (often 200+ feet below surface in western Kansas) provides some natural protection, the recharge areas where surface water enters the aquifer may be vulnerable to contamination from agricultural chemicals, including PFAS in biosolids applied as fertilizer.
Among Great Plains states, Kansas has a more documented PFAS problem than Nebraska or the Dakotas, largely because of the McConnell AFB contamination. Colorado, with multiple military installations and a larger population, has a more extensive PFAS profile. Oklahoma's situation is less well characterized.
Kansas faces a unique long-term challenge in the Ogallala Aquifer depletion. The aquifer is being drawn down faster than it recharges – in some parts of western Kansas, water levels have dropped by more than 150 feet since large-scale irrigation began in the 1950s. According to the Kansas Geological Survey, portions of the aquifer in southwest Kansas may be effectively exhausted within 25 years at current pumping rates. This is a quantity crisis rather than a quality crisis, but it intersects with contamination concerns: as the aquifer shrinks, remaining water may carry higher concentrations of any dissolved contaminants.
On treatment infrastructure, Kansas performs reasonably well for its larger systems but struggles with the same rural capacity gaps as other agricultural states. Small systems serving a few hundred people often lack the technical and financial resources to address emerging contaminants.
Your water quality picture in Kansas depends heavily on whether you are in the Wichita metro, in eastern Kansas on surface water, or in western Kansas on the Ogallala.
1. Check your specific location at the homepage. We show available monitoring data by ZIP code, including PFAS results where available. 2. Wichita-area residents near McConnell AFB should pay particular attention to PFAS data. If you are on a private well within several miles of the base, contact KDHE about available testing programs or the DoD's response efforts. 3. Western Kansas well owners should test for nitrate and total dissolved solids in addition to considering PFAS testing. The Ogallala's water quality is changing as levels decline. 4. Review our water filter guide for options that address the specific contaminants showing up in your area. A detailed water report can provide multi-year trends.
Kansas's water story is defined by two forces: agriculture and military activity. The Ogallala Aquifer enabled the transformation of western Kansas from dryland ranching to intensive irrigated agriculture in the postwar period. Center-pivot irrigation systems, visible as green circles from the air, pump billions of gallons annually from the aquifer. The resulting agricultural boom made Kansas a global grain producer but set the aquifer on an unsustainable trajectory.
The Kansas Water Office and the state legislature have attempted various conservation measures, including Local Enhanced Management Areas (LEMAs) that allow groundwater districts to impose pumping reductions. The Sheridan County LEMA, established in 2013, was one of the first farmer-led aquifer conservation programs in the country and has shown measurable results in slowing drawdown. But the fundamental math – extraction far exceeding recharge – has not changed.
McConnell AFB's PFAS contamination came to public attention in the mid-2010s when DoD testing detected PFOS and PFOA in groundwater at concentrations exceeding 1,000 ppt in some monitoring wells – orders of magnitude above current health advisories. The base, an active B-1B bomber installation, used AFFF extensively in training exercises over several decades. The contamination plume extends off-base into residential areas south and east of the facility.
Wichita's water system has been relatively proactive. The Equus Beds Aquifer Storage and Recovery project, which began in 2006, has banked over 2 billion gallons of treated water underground to buffer against drought and maintain supply for the city. This kind of infrastructure investment is beyond the reach of most Kansas communities.
Reservoir sedimentation is another slow-motion crisis. Many of Kansas's federal reservoirs – built in the 1950s and 1960s for flood control and water supply – are filling with sediment from upstream erosion. John Redmond Reservoir, a key supply for several eastern Kansas communities, has lost roughly half its storage capacity to sedimentation. Dredging efforts are underway but expensive, and the upstream erosion that drives sedimentation continues.
Check your address to see what data is available for your part of Kansas. In a state where water challenges range from aquifer depletion to military contamination, knowing your local situation is the starting point.