Water Quality Improvement Project
© Hank Lipchak, Flickr.
Excessive nutrient inputs to lakes provide aquatic plant and algae dominance, making lakes unsuitable for recreation or viewing enjoyment. Phosphorus is one of the nutrients. When it is discharged into a waterbody, like a lake, it fuels the growth of algae.
Excessive algae growth reduces water clarity, increases oxygen demand in the bottom sediments severely impacting coldwater aquatic habitat, and can, depending on the dominant algae present, pose a human health risk.
TMDL studies based on lake restoration plans for both Campbell and Erie lakes were submitted to the Environmental Protection Agency (EPA) by Ecology. EPA approved the TMDLs in 1997.
Alum treatments were applied to the lake for phosphorus control. Monitoring showed that the process was a success, but must be repeated on a recurring basis to maintain the water quality standard for aesthetics.
The TMDL studies on both Campbell and Erie lakes indicated restoration activities were successful, and the lakes were in compliance with the TMDL goals set for total phosphorus.
Erie Lake Total Phosphorus Total Maximum Daily Load (Ecology
Lake Campbell and Lake Erie Total Phosphorus Total Maximum Daily Load -
Water Quality Effectiveness Monitoring Report (Ecology publication)
Quality Assurance Project Plan: Total Maximum Daily Load Effectiveness
Monitoring Study: Lakes Erie and Campbell (Ecology publication)
WRIA 3: Lower Skagit-Samish Information (Water web site)
# of TMDLs: 1
Approved by EPA
Copyright © Washington State Department of Ecology. See http://www.ecy.wa.gov/copyright.htm