2017 NATIONAL LAKES ASSESSMENT Nutrient Pollution 46% Poor Good Elevated 46% 1 8390/01 Nitrogen Fair 15% 1^ 45% Poor Good 45% 1 41% II Elevated w Phosphorus WFair0l 14% Nutrient pollution was the most widespread stressor measured https://www.epa.gov/national-aquatic-resource-survevs/nla Biological Condition Good, 47% Fair, 27% Poor, 24% Biological condition based on macro invertebrate communities Poor 45 % Good 34% Fair 20% Chlorophyll a, indicates the amount of algae and cyanobacteria present and was in excess in 45% of lakes Chemical Indicators 600600666 666666666 666666666 6666666666 6666666666 The herbicide atrazine was detected in 30% of lakes and exceeded the EPA "concentration level of concern" in 0.5% of lakes •I Microcystins were detected in 21% of lakes and levels exceeded the EPA recreational criterion in 2% of lakes v>EPA ------- |