Great Lakes Echo - Environmental news of the Great Lakes region

Great Lakes Echo (https://greatlakesecho.org/2010/03/02/study-lakes-in-the-great-lakes-region-healthier-than-those-in-the-rest-of-the-nation/biological-quality-small/)

Biological Quality

Published March 1, 2010 at 4200 × 2954 in Lakes in Great Lakes region healthier than those elsewhere

This map shows the biological quality of nationwide lakes. Image: EPA