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Stormwater Permits, Plans and Reports


The City of Lake Oswego's obligations toward our stormwater permit ("municipal separate storm sewer" or MS4) and related water quality ("total maximum daily load" or TMDL) are outlined in a number of plans and progress reports, provided as Supporting Documents.  These Supporting Documents are prepared by the City in response to the MS4 permit and TMDL analyses. The Permit and TMDLs are prepared by the Oregon Department of Environmental Quality and available through the web links at the bottom of this page.

The City is accepting comments through 5:00 P.M., October 29, 2014, on our current annual report to DEQ. Comments will be considered as the City finalizes the document prior to submission to DEQ by November 1, 2014. Please email comments to the Stormwater Quality Coordinator at

MS4 Annual Report 2013-2014 Public Review Draft