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Water Quality Improvement Project
© Stephen J. Brown
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.
A Total Maximum Daily Load (TMDL) study for Lake Ballinger was submitted by Ecology. EPA approved the TMDL in 1993. Data from monitoring done in 2005 show that Ballinger Lake met the phosphorus level goals specified in the TMDL.
Ballinger Lake Total Phosphorus Total Maximum Daily Load (Ecology
Quality Assurance Project Plan: Lake Ballinger Total Maximum Daily Load
Effectiveness Monitoring Study (Ecology publication)
Lake Ballinger Total Phosphorus Total Maximum Daily Load: Water Quality
Attainment Monitoring Report (Ecology publication)
WRIA 8: Cedar-Sammamish Watershed Information (Environmental Assessment
Program web site)
# of TMDLs: 1
Approved by EPA
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