The Puyallup Water Pollution Control Plant (WPCP) is an MLE activated sludge treatment plant with an average flow of 5 MGD. In the winter, the peak wet weather flow jumps up to 20 MGD. The WPCP discharges into the Puyallup River, which is a salmon bearing stream and has important historical and economic concern to the local Puyallup Tribal Nation. Because of these concerns, the WPCP has a very strict copper limit, and nutrient removal has been the goal for 20 years.
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