Wyandotte County, Kansas: drinking water report. Wyandotte County is consolidated with Kansas City, Kansas, with a population of about 167,000.
Wyandotte County is consolidated with Kansas City, Kansas, with a population of about 167,000. The Board of Public Utilities draws water from the Kansas (Kaw) River and the Missouri River, treating it at the Nearman Water Treatment Plant. Both rivers carry heavy agricultural runoff from the Kansas and Missouri watersheds – among the most intensively farmed regions in the country. The county also hosts significant industrial operations, including rail yards, meatpacking plants, and chemical facilities along the riverfront.
The Kansas River carries atrazine at concentrations that regularly spike during spring planting. According to the USGS monitoring station at DeSoto (upstream of KCK), atrazine concentrations exceeded 3 ppb on 15 days during the spring 2024 season. The Board of Public Utilities' treatment removes atrazine to compliant levels, but the raw water challenge is significant.
The county also sits adjacent to the former Sunflower Army Ammunition Plant in neighboring Johnson County, which has documented explosives and solvent contamination in regional groundwater. The EPA's UCMR5 data shows PFAS detections in the KCK system. A 2024 KDHE report documented PFAS at low levels in two monitoring points within the system.
Wyandotte County's drinking water carries the agricultural signature of the entire Kansas River basin. Spring and early summer are the peak risk periods for herbicide spikes, and that is when supplemental household filtration provides the most value.
Check your water for the latest data on your area. For atrazine and disinfection byproducts, activated carbon filters certified to NSF 53 are effective. For PFAS, reverse osmosis adds broader protection. Our water filter guide covers both. Pull your detailed report for seasonal patterns, and visit our Kansas page for statewide context.