Lake George: Class AA-Special water quality, but also impaired

scenic view of lake georgeLake George is rated Class AA-Special by New York State. It is drinking water.

Despite this very high classification for the Lake’s water quality, Lake George is also on New York’s 303(d) list of impaired waterbodies because the Lake and a number of its tributary streams are listed as impaired from silt and sediment caused by stormwater runoff and erosion.

Key factors affecting Lake George water quality

Water quality is a result of  what goes in the water (nutrients, pathogens, contaminants, invasive species) and what stays there (increased productivity, turbidity, etc.).

When managing Lake George’s water quality, key factors we consider include:

You might think that in a large, deep basin of water like Lake George, any pollution entering the Lake will just be diluted. While it’s true that the Lake’s depth does allow for a certain amount of dilution, Lake George’s long retention time means that what does enter is there for a long time.

If the rate of pollutants entering the lake increases too quickly, the Lake’s natural capacity to clean itself can’t keep up.

Watersheds and water quality

Lake George's watershed is much smaller and steeper than Lake Champlain's watershed The mountains surrounding Lake George create a small watershed with steep slopes. This small, forested watershed doesn’t produce much pollution; it keeps Lake George’s water clean and clear.

You could compare our watershed with one like Lake Champlain. The much larger Lake Champlain watershed has areas of flat land that allow urbanization and agriculture. Due to its size and land uses, pollution from the Lake Champlain watershed has had a much greater impact on the water quality of that lake.

How human activities in the watershed affect the Lake’s water quality

Lake George has had watershed size and land use on its side for a long time. However, add changing land use in the watershed to our Lake’s long water retention time, and a decline in water quality is a real concern:

  • When trees and vegetation are cleared for development, the soil (with nothing to hold it in place) quickly erodes, right down the very same steep slopes that have been protecting the Lake for so long.  In addition, stormwater runoff from roads, parking lots, roofs and other impervious surfaces sends pollutants such phosphorus, soil and road salt even more quickly into the Lake.
  • When we bring new and potentially invasive species into the watershed through landscaping, boating, fishing, or other recreational activities, we change the organic matter in the lake.  This changes the water quality and puts stress on native plants fish and wildlife in the Lake George food web.

The health of the lake will continue to decline unless we all do our part to protect the water.

We all are here because we love the Lake: the beauty, the tranquility, and the memories it holds for us. But the Lake can’t protect itself. It relies on those who love it to protect it as well.

drawing showing how human activity affects the lake
Image credit: UW Extension and Wisconsin DNR

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All the money raised by the Lake George Association stays in the Lake George watershed and is used to protect Lake George from Ticonderoga to Lake George Village.
Lake George Association

Lake George Association