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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) 2015-2016 IEPA Annual NPDES Permit for Stormwater Drainage (PDF) 2014-2015 IEPA Annual NPDES Permit for Stormwater Drainage (PDF)