A LAKE OR STREAM HAS A DELICATE
BALANCE
WE CAN HELP MAINTAIN OR
INJURE...LIKE FALLING
DOMINOES, ONE AFFECTS ALL. 
Pollution enters a lake or stream easily, as shown in the school drawing at top left. There are sources of pollution from the watershed, called Non-Point Source pollution, and sources at the lake, called, Point Source pollution.
  There are many sources of pollution, storm water, livestock, factories, farms, roads roofs, lawns, all within the watershed.
  Generally, controlling how water flows from the watershed can help limit pollutants coming into a lake or stream.
  People are the greatest contributors of pollution for a lake or stream, usually through carelessness.

  Water Quality is illustrated by the drawing at  bottom left. It depicts those things that can have the  most impact on  water quality.
  Water quality is dependent upon a healthy habitat, influx of "new" water, chemical balances, quantity of aquatic plants, and more.
  Chemical imbalances, like too much phosphate, can cause an overabundance of exotic and unwanted plants that disturb the balance of the fishery.
  Constant stirring of the water by excessive boat or watercraft uses,  particularly in shallow areas, also disturb the balance of chemicals by hindering natural digestion of those elements at the lake bottom. This in turn, disturbs the fishery, plant life, etc.
  Good management of the watershed and lake use can actually improve water quality, fishing and
property values.