U.S Environmental Protection Agency
   Envirofacts
   Surf Your Watershed
   Nonpoint Source Homepage
   TMDL Home page
   Clean Lakes Program

U.S. Department of Agriculture
   Agricultural Research Service
   Natural Resources Conservation Service

Other sites
   Environmental Information Resources
   National Wildlife Federation
   U.S. Geological Survey
   Global Rivers Environmental Education Network
   Washington State Lake Book

Interesting sites about invasive species
   Center for Aquatic & Invasive Weeds
   Invasive Species
   USGS Non-indigenous Aquatic Species
   Aquatic Nuisance Species Task Force
   Weevil Information

More information about:
   Benthic Organisms
   Endangered Species
   Hazardous Waste Alternatives
   Hazardous Material Facts