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2020-2021 IEPA Annual NPDES Permit for Stormwater Drainage (PDF) 2019-2020 IEPA Annual NPDES Permit for Stormwater Drainage (PDF) 2018-2019 IEPA Annual NPDES Permit for Stormwater Drainage (PDF) 2017-2018 IEPA Annual NPDES Permit for Stormwater Drainage (PDF) 2016-2017 IEPA Annual NPDES Permit for Stormwater Drainage (PDF)