Lake by lake
Resources and references
About the Great Lakes LaMPs study...
Glossary of terms
Other health issues
in the Great Lakes
Apart from the major Great Lakes health concerns of drinking water, recreational water, and fish consumption, there are a number of related issues that are interconnected to air and water quality, pollution and contamination, agriculture and industry, and wildlife.
Air quality |
Bacterial infection and beach closings |
Persistent Organic Pollutants (POPs)
The presence of toxic substances in the Great Lakes continues to be a significant concern in the 1990s. In the U.S., some 70,000 commercial and industrial compounds are now in use. More than 30,000 chemicals are produced and used in the Great Lakes region. There have been 362 contaminants identified in the Great Lakes system; of these 362, approximately one-third have been evaluated for their potential toxic effects on aquatic life, wildlife, and human health, according to the International Joint Commission (IJC). In 1985, eleven of the most persistent and widespread toxic substances were identified as "critical Great Lakes pollutants" by the IJC. These critical pollutants are the following:
All eleven of the persistent toxic substances tend to bioaccumulate in organisms, biomagnify in food webs, and persist at high levels in some areas of the ecosystem of the Great Lakes. In the Great Lakes basin, 43 geographical locations in the U.S. and Canada have been identified as Areas of Concern (AOCs) because of high concentrations of these toxic pollutants. Of these 43 locations, 26 are located within the boundaries of the U.S. and five are shared with Canada, (i.e., connecting channels).
Eight of these pollutants are organochlorine compounds and are potentially harmful because of their persistence, ubiquity, and associated toxicity. Both alkylated lead and methylmercury are heavy metals that are potentially harmful because of their chemical characteristics and demonstrated toxicity. Eight of the eleven IJC critical pollutants are lipophilic and biomagnify within the aquatic food chain, thereby making them available to higher forms of life including humans. PAHs, methylmercury, and alkylated lead also bioaccumulate in human tissues.
Demonstrating health effects in humans from chronic, low level exposure to persistent organic pollutants typically encountered in the Great Lakes region is a challenge for researchers. Human epidemiological studies are limited in their ability to separate health effects attributable to contaminant exposures from those related to other known health factores like smoking, alcohol intake, and general health status. In addition, exposure to contaminants from Great Lakes fish is dependent upon the amount eaten and species consumed. For many parts of the Great Lakes basin, there is little information available on exposure levels, body burdens, and health effects.
Last modified: April 29, 2003