Staff updates board on MS4 and CSGP draft changes from IDEM

Sep 23, 2026

Town staff reported on a stormwater conference summary: IDEM may shift post-construction requirements from the CSGP to the MS4 general permit; drafts are not public, and staff expect follow-up by year end.

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Michael briefed the board on proposed regulatory changes discussed at a recent stormwater conference. He said IDEM presented draft changes that are not public yet but could change how local MS4s handle post-construction requirements; staff are gathering information and expect an update by the end of the year. "IDEM is considering removing post construction requirements from the CSGP and keeping the post construction requirements in the MS4 general permit," Michael said.

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