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Sedgwick County staff propose raising rural minimum lot size to protect water resources
Summary
Planning staff proposed amending the comprehensive plan and unified zoning code to raise the rural residential minimum from 2 to 5 acres and to limit rezonings to single-family districts where municipal or rural water service exists; commissioners asked staff for permit data and mapping and directed staff to draft regulations for future consideration.
Justin Constantino of the Sedgwick County Planning Department told commissioners that staff are drafting changes to the comprehensive plan and unified zoning code to address water-quality and water-quantity concerns tied to rural residential density. He said staff recommend limiting new residential density where municipal or rural water is not available and increasing the RR (rural residential) minimum from 2 acres to 5 acres.
The change would appear as edits to the comprehensive plan's locational guidelines and to the unified zoning code. Constantino reviewed existing rules and noted that subdivision regulations tie lot-size minimums to wastewater treatment options (for example, lagoons historically required larger acreage, while advanced on-site systems can allow smaller lots depending on soils). He also showed how other Kansas counties set widely varying rural minimums: Johnson County (10 acres), Douglas County (10–20 acres), Saline County (3 acres) and Riley County (2 acres).
Commissioners pressed staff on implementation details and compatibility with the rezoning process. The chair and several members said water availability — not arbitrary countywide limits — should drive where higher-density single-family zoning is allowed. Commissioners debated policy tools: a flat, countywide 5-acre minimum in the RR district; conditional use permits or overlays for targeted areas; and strengthening comprehensive-plan language to require municipal or rural water for single-family rezonings.
A discrepancy between documents emerged during the discussion: planning and subdivision rules currently list different minimums for lagoon siting (the zoning text referenced 4.5 acres, subdivision regulations 5 acres), and county sanitary-code changes appear to allow lagoons on as little as 3 acres but the updates have not been fully enacted across related documents. County wastewater staff said advances in treatment technology and alternative systems reduce odor and can make smaller-lot wastewater solutions feasible in some soils, complicating a single-number rule.
The commission did not adopt formal legislation at the workshop. Instead, commissioners directed staff to gather permit and application data (requests for lots between 2 and 5 acres), produce a map showing where those approvals are occurring, bring Tim Wagner or sanitary/wastewater staff into follow-up discussions, and return in a few weeks with drafted regulatory language. Staff described the likely initial framing as a 5-acre RR minimum and limiting single-family rezonings in RR to parcels served by municipal or rural water, but said specific language and targeted options (overlays, conditional uses) will be developed and presented to the board for formal consideration.
Next steps: staff will compile the historical lot-permit data and maps requested by the chair, refine code language to reconcile zoning and subdivision discrepancies, and return to the commission with proposed regulatory text and analysis before any vote.
