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Lower Okanogan River Basin DDT and PCB Total Maximum Daily Load: Water Quality Effectiveness Monitoring Report

Publication number Date Published
11-03-009May 2011
VIEW NOW Lower Okanogan River Basin DDT and PCB Total Maximum Daily Load: Water Quality Effectiveness Monitoring Report (Number of pages: 79) (Publication Size: 1MB)

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Author(s) Newell, E
Description DDT and PCB concentrations in composite fish tissue samples collected from the Lower Okanogan River in 2001 were compared against a similar data set collected in 2008. Three species were sampled: smallmouth bass (Micropterus dolomieui), mountain whitefish (Prosopium williamsoni), and common carp (Cyprinus carpio).

The number of samples not meeting (exceeding) National Toxics Rule criteria was similar between the 2001 and 2008 studies. No carp specimens were obtained from the lower reach in 2001 due to unavailability. However, large specimens of carp collected from this reach in 2008 had elevated concentrations of total DDT.
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Keywords Okanogan River, WRIA 49, fish, basin, water quality, monitoring, toxic, Total Maximum Daily Load, DDT
WATERSHED Water Resource Inventory Area 49 Okanogan
DATA Environmental Information Management (EIM) #CCOF0003


Quality Assurance Project Plan: Okanogan River DDT and PCB Total Maximum Daily Load Effectiveness Monitoring

Lower Okanogan DDT PCB Detailed Implementation Plan: Water Quality Implementation Plan

Lower Okanogan River Basin DDT and PCBs Total Maximum Daily Load: Submittal Report