Sedgwick County expands stormwater rules to all unincorporated areas; commissioners approve amendments

The Sedgwick County Board of County Commissioners on Sept. 3 adopted amendments to the county Stormwater Management Code that extend water-quality requirements to all unincorporated areas and move administration of the code to the Division of Public Works.

County Engineer Lynn Packer, who presented the item, said the change would expand inspections and design standards currently limited to urban areas so that water leaving new developments is treated more consistently before it reaches downstream lakes and private wells. "Stormwater quality has become more of an issue with property owners, especially with subdivisions that are popping up outside of areas that have access to city or rural water connections," Packer said.

The move responds to repeated blue-green algae advisories at local recreation areas and citizen concern about well water quality, county staff said. Susan Erlerwine, director of Environmental Resources, described testing around local sand pits that found elevated pesticide and nutrient levels in groundwater downgradient from some excavations. She said monitoring showed some chemicals were present at higher concentrations downstream of sand pits than upgradient controls.

Commission debate was lengthy. Commissioner Trevor Howe argued the change would raise development costs, potentially harming housing affordability, and questioned the effectiveness of expanded rules against nonpoint agricultural runoff. "Farmers are exempt from this regulation," Howe said, noting suspended sediment (dirt) is a leading pollutant and arguing the proposed rules would impose costs on developers without addressing the largest sources of runoff. "I'm going to be opposed," he said during the discussion.

Supporters, including Packer and Commissioner Scott Meitzner, said the policy is a long-term, countywide measure intended to reduce smaller, frequent flooding and decrease nutrient loading that contributes to algae events in lakes. Packer noted the amendment aligns county standards more closely with the City of Wichita's existing requirements and stressed the change will take effect as new development occurs rather than immediately altering existing projects.

Stormwater manager Scott Lindenback told the commission that common low-cost measures such as grass swales and vegetated practices can achieve much of the desired water-quality gains in rural subdivisions, while denser development uses detention ponds that can be designed to provide quality treatment in a relatively small additional footprint.

After debate, the commission voted to adopt the amendments. The roll call produced a 4–1 vote: Commissioners Blue Ball, Wise, Meitzner and Chairman Beatty approved the change; Commissioner Howe voted no.

County staff said they will follow up with additional outreach to developers, water districts and municipal partners, and that the ordinance change will be phased in as plats and development proposals are filed. Packer described the change as the first step toward broader regional cooperation on water quality and said staff will pursue coordination with cities in Sedgwick County.

The amendments take effect after publication of the adopted resolution and as subsequently applied during plan review and permitting. The county will provide design guidance and contact information for developers seeking compliance details.

Votes at a glance: The board approved the Stormwater Management Code amendments by a 4–1 vote.