Primary Water Quality Sites

EPA's Office of Water

Monitoring and Assessing Water Quality (EPA page)

Water Quality Standards and Criteria (EPA page)

Section 404 of the Clean Water Act

USGS Water Resources Information

USGS publications

Handbook of water quality monitoring (Part 1, NRCS)

Handbook of water quality monitoring (Part 2, NRCS)

Clean Water - A newsletter concerning water quality issues.

WaterOnline

USDA's Water Quality Information

Idaho Division of Environmental Quality

Vital Water Graphics (United Nations Environmental Programme, UNEP)

University of Idaho Water Quality Home Page

Secchi Disk

Water/hydrology links