Great Lakes Monitoring

Clean water is fundamental to a healthy Great Lakes ecosystem.

• Beach Closings
  When bacteria standards are exceeded, local authorities may close swimming at a beach or issue an advisory that water is unhealthful for swimming.
• Dissolved Oxygen Depletion in Lake Erie
  Oxygen is essential for all plants and animals to survive, whether they live on the land or in the water. The Central Basin of Lake Erie is susceptible to low dissolved oxygen concentrations
• Lake Erie Phosphorus
  Phosphorus is an essential element for all organisms and is found naturally in tributaries and run-off waters. Excessive phosphorus can lead to over-enrichment with algae and aquatic weeds and depletion of dissolved oxygen as the excess plant and animal matter decay.
• Trophic State
  The trophic state of lakes is indicative of their biological productivity, that is, the amount of living material supported within them, primarily in the form of algae.