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Water Quality Improvement Projects (TMDLs)

Okanogan County projects

The following table lists overview information for water quality improvement projects (including total maximum daily loads, or TMDLs) for this county. Please use links (where available) for more information on a project.

To get additional information about the water bodies in Okanogan County please use the Water Quality Assessment Query Tool.


WRIAs in Okanogan County

  • WRIA 47 - Chelan
  • WRIA 48 - Methow
  • WRIA 49 - Okanogan
  • WRIA 50 - Foster
  • WRIA 51 - Nespelem
  • WRIA 52 - Sanpoil
  • WRIA 53 - Lower Lake Roosevelt
  • WRIA 60 - Kettle

Waterbody Name Pollutant(s) Status TMDL Lead(s)
Okanogan River, Lower DDT
EPA approved

Has an implementation plan

Mark Peterschmidt
Similkameen River


Palmer Creek

Arsenic EPA approved Mark Peterschmidt

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Last updated April 2014