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MS4 Annual Report 2023 (PDF) MS4 Annual Report 2022 (PDF) MS4 Annual Report 2021 (PDF) MS4 Annual Report 2019 (PDF) MS4 Annual Report 2017 (PDF) MS4 Annual Report 2016 (PDF) MS4 Annual Report 2015 (PDF) MS4 Annual Report 2014 (PDF) MS4 Annual Report 2013 (PDF) MS4 Annual Report 2012 (PDF) Ms4 Annual Report 2011 (PDF) Summary Major Changes 2003 through 2010 - Small MS4s Permit (PDF)