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Staff: state shoreland rules cap impervious coverage at 25% to protect lakes
Summary
Land‑services staff reminded the board that Minnesota shoreland rules limit impervious coverage to protect ground and surface water, and explained how setbacks and lake classifications affect local permitting.
Chris told the committee that shoreland rules and lake classifications drive many county permit requirements. "When we're dealing with, within the thousands feet of a lake, there's definite requirements in Minnesota rule 6120, and they do have caps impervious limits on those lots at 25%," he said, framing the standard as one protective measure for water quality.
He explained that those state rules establish minimums the county must meet but that counties may adopt more restrictive measures. Chris walked through setback sizes by lake class (for example, general development lakes use a 75‑foot setback split into shore impact zones; natural environment lakes have larger setbacks and, in some cases, special shallow lake protections) and noted the county uses a protected‑waters inventory to verify ordinary high‑water marks and other regulatory elevations.
Staff stressed the purpose of impervious limits and setbacks is to prevent runoff and contamination of groundwater and surface water and to reduce conflicts between intensive and residential uses along shorelines.
