Water Links

Government Agencies
http://www.epa.gov/ow Environmental Protection Association (EPA)
http://www.astm.org ASTM
http://www.usgs.gov US Geological (USGS)

Water Associations
http://www.awwa.org American Water Works Association (AWWA)
http://www.nrwa.org National Rural Water Association (NRWA)

Company Sites
http://www.amcoclear.com AMCO Clear Turbidity Standards
http://www.in-spec.com In-Spec Photometric Standards for Spectrophotometers
http://www.gfschemicals.com GFS Chemicals, Inc.
http://www.gfsinternational.com GFS Chemicals International Sites