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City of Lake Oswego

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.

Please email comments on this report to the City's Stormwater Quality Coordinator, Anne MacDonald, no later than March 20, 2016. These comments will be considered in any revisions to this submittal.

In addition to the normal reporting on TMDL activities in Appendix D of the annual report, the City has made minor revisions to the TMDL Implementation Plan at DEQs request for their review and approval. These revisions consisted of changing the TMDL Imlementation Plan period of performance to 2015-2019 (rather than 2015-2020) and additional clarification of implementation milestones (see revised Table E-1). A complete version of the revised plan will be posted here once the revisions are approved by DEQ.