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Stewartville notified as MS4 by MPCA; council told to document stormwater outlets and begin inspections
Summary
The Minnesota Pollution Control Agency has designated Stewartville as an MS4, which will require the city to document stormwater outlets, institute inspections and monitoring, and run public-education activities; staff proposed using GIS and assigning tasks to existing public-works employees.
City staff informed the council Stewartville has been officially identified by the Minnesota Pollution Control Agency as a municipal separate storm sewer system (MS4). Staff explained the designation will trigger permit requirements, documentation, inspections, and public-education obligations under MPCA rules.
Staff said much of the citys existing stormwater work is already in place but that the MPCA designation requires formalizing practices: the city must map every discharge/outlet, document periodic inspections, and follow up on observed discharges or noncompliance. Staff described a practical approach using the citys GIS system so public-works crews can record outlet locations, attach photos and notes while on site, and automatically create documentation for MPCA audits. City staff recommended assigning core responsibilities to existing employees (Dylan and Sean were named as likely leads) and splitting reporting duties so no single person carries the whole workload.
Council members asked whether the designation changes what the city does materially; staff replied that the primary difference is required documentation and auditability rather than entirely new fieldwork in many areas. One councilmember asked how the city previously handled stormwater enforcement; staff said enforcement had been more ad hoc and generally the counties/other regulators had handled enforcement in the past, but that the MS4 designation shifts formal responsibility to the city for future inspections and corrective actions.
Staff noted the city will need to demonstrate annual public-education activities (flyers, booths at community events, or online campaigns) and keep records to show MPCA the city is fulfilling the educational component. A provisional timeline was discussed for implementation and the MPCAs auditing process; staff suggested full formal implementation around 2026, while working with MPCA if earlier steps are triggered.
Next steps: staff will draft an implementation plan with a GIS-based inspection program, assign responsibilities, and present a timeline to council for phased compliance work. The council asked staff to consider how to document and staff the duties without overburdening existing employees.
