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.  Each year, the City prepares and submits the MS4/TMDL Annual Report to DEQ, describing efforts to manage water quality in the City for the prior fiscal year.

The City applied for a UIC permit which was approved by DEQ on October 3, 2016. Visit our UIC page for more information.



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