Last week, caffeine and prescription drugs were found in trace amounts in the drinking water of Portland and several other large metropolitan regions.

This week, the US Army Corps of Engineers has released information showing that industrial chemicals, known as PCB's or polychlorinated biphenyls have been found to be present in unsafe levels in bass caught near the Bonneville Dam.

A seperate report, released as part of a five-year study by the USGS showed that 1/4th of all tributaries leading to the Columbia River had pesticides, and that trace amounts have also been found in Portland's drinking water.