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New law S.310 prompts Chittenden County towns to reconsider how stormwater utilities calculate ERUs

Chittenden County Regional Planning Commission MS4 Subcommittee · April 1, 2026
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

At the MS4 Subcommittee meeting July 9, South Burlington’s Marisa Rorabaugh said Vermont Act S.310 (effective July 1) prescribes how utilities calculate an Equivalent Residential Unit (ERU), likely requiring municipalities to update impervious-surface data; CCRPC staff and members discussed options for who collects the data and whether to recalculate townwide averages.

South Burlington council member Marisa Rorabaugh said Vermont Act S.310 took effect July 1 and includes specifications for how stormwater utilities must calculate an Equivalent Residential Unit (ERU), a technical change she said will require municipalities to revise current methods.

"S.310 came into effect July 1," Rorabaugh said during the Chittenden County Regional Planning Commission MS4 Subcommittee meeting on July 9. She said South Burlington will have…

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