Sedgwick County adopts countywide stormwater code after extended debate

The Sedgwick County Board of County Commissioners approved amendments to the county Stormwater Management Code on Sept. 3, 2025, extending stormwater-quality requirements to all unincorporated areas and transferring oversight from Environmental Resources to Public Works.

Director of Public Works and County Engineer Lynn Packer told commissioners the change aims to create consistent, countywide standards that reduce pollutants reaching downstream waters. "We want to make this more of a regional attack," Packer said, citing repeated blue‑green algae closures at Lake Afton and concerns about groundwater quality in unserved well areas. Packer said staff expects the change to be phased in as new subdivisions are platted and annexation/road planning proceeds.

Commissioner Howe opposed the measure, arguing it would increase development costs and disproportionately affect builders and homebuyers in unincorporated areas. "I think this is gonna pass. I'm gonna be opposed," Howe said, adding he feared larger retention requirements would raise housing costs without substantially addressing certain dissolved contaminants.

Environmental Resources director Susan Ellerwein and stormwater manager Scott Lindeback described low‑cost options (grass swales, channel protection and detention ponds) that can be used in rural and suburban settings. Ellerwein summarized a county study of sand‑pit lakes and nearby private wells that found elevated pesticide and nutrient concentrations migrating downgradient. "The water table is very shallow in these areas," she said, noting monitoring wells showed higher atrazine levels in downgradient samples than upgradient controls.

The board voted 4–1 to adopt the amendments. Commissioners and staff agreed to monitor the policy’s implementation and to coordinate with cities and developers to minimize unintended cost impacts on housing projects.