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Walla
Walla WatershedThe Walla Walla Watershed is located in southeastern Washington in Walla Walla and Columbia counties and extends into Oregon. This drainage basin covers approximately 1760 square miles, two-thirds of which are within Washington State. Three rivers in the watershed were placed on the 1998 Water Quality Assessments (303[d]) list, with additional listings on the 2004 list, because they do not meet water quality standards.
- Chlorinated Pesticide & PCB TMDL
- Fecal Coliform Bacteria TMDL
- Temperature TMDL
- Dissolved Oxygen and pH
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