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TMDL Technical Assessment of DDT and PCBs in the Lower Okanogan River Basin

Publication number Date Published
03-03-013July 2003
VIEW NOW: TMDL Technical Assessment of DDT and PCBs in the Lower Okanogan River Basin (Number of pages: 142) (Publication Size: 2MB)

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Author(s) Serdar, D.
Description Prompted by elevated concentrations in fish tissues, a TMDL assessment was done for DDT and PCBs in the lower Okanogan River basin. Results indicate there is little external loading to the mainstem Okanogan River through tributaries or sewage treatment plants (STPs). Most tributaries and STPs are below load/waste load allocations needed to meet criteria. Contaminated sediments appear to be the primary source for accumulation in fish tissues Significant decreases in sediment DDT and PCB concentrations will be necessary to reduce fish tissue concentrations below criteria. Recommendations are made to augment data from Osoyoos Lake and in certain fish species.
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Keywords recommendations, Okanogan River, investigation, contaminated, technical, toxics, results, sampling, environmental, fish, study, basin, river, plan, water, assessment, Ecology, waste, PCBs, pesticide, lake, contaminated sediment, DDT
WATERSHED Water Resource Inventory Area 49 Okanogan
DATA Environmental Information Management (EIM) #DSER0009


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