Total Maximum Daily Loads (TMDLs)

A TMDL is the calculated pollutant amount that a waterbody can receive and still meet Oregon water quality standards. This page contains links to Oregon Water Quality Standards and the applicable TMDLs within the City of Lake Oswego.

View links below:

• Oregon Water Quality Standards
• Tualatin River TMDL (includes Oswego Lake TMDL)
• Willamette River TMDL (includes Tryon Creek and Springbrook Creek TMDLs)