McHenry County panel debates raising impervious-area exemption, advances plan for a ‘simplified method’ tool County staff presented analyses showing why keeping a half-acre trigger may be safer than a blanket 1-acre exemption and proposed a GIS-based "simplified method" to let landowners estimate runoff without routine engineering. The committee asked staff to refine curve-number tables and bring a draft tool back for review.

McHenry County is considering a game-changing stormwater ordinance that could raise the exemption threshold for impervious-area reviews—will this move put local communities at greater risk of flooding?

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