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Friday, December 9, 10:10 am

All SVC locations are open with normal operations, with the exception of the Marine Technology Center in Anacortes. The Marine Technology Center in Anacortes is closed today.


Human Impacts

Point Source Pollution

Single source that discharges pollutants into the environment.

  • Smokestacks
  • Drainpipes
  • Chimneys
  • Effluent pipes from industry or wastewater treatment facilities
  • Generally easy to identify and control (cost not considered)

Non-Point Source Pollution

Discharge of pollutants into the environment over a large area from a dispersed source.

  • Fertilizer applications
  • Pesticide applications
  • Manure from domestic livestock
  • Automobile exhaust
  • Air pollution from metropolitan and industrial areas
  • Sediment from land use practices (grazing, urban development, agriculture, forestry)

Air pollution from urban or industrial areas:

  • Acid deposition
  • Nutrients (NOx) fertilization of oligotrophic ecosystems


  • Nutrients (N & P)
  • Pesticides
  • Toxic pollutants
  • Generally more difficult to identify sources and consequently control
  • May have origin outside the boundary of watershed of concern

Impervious Surfaces

Coming Soon

Land Uses and Natural Events

Land Uses Char