Rivers
Mississippi, Missouri, Ohio, Potomac, Saint Croix, American Heritage Rivers, American Rivers, Mississippi River Basin Alliance, River Forecasts, River Network, Southeast River Forecast Center, The Nationwide Rivers Inventory, Upper Mississippi, Illinois and Missouri River Ass, USGS Real-Time Water Data
Center for Environmental Education and Information
CEEI documents polluted streams in the United states by publishing on the web all the Clean Water Act 303(d) lists and documentation.
Great Lakes Aquatic Habitat Network and Fund
Provides information and financial support to those working to protect and restore shorelines, lakes, rivers, wetlands, and other aquatic habitats in the Great Lakes Basin. Includes news and grant information.
Ground Water Atlas of the United States
Online USGS publication describes U.S. ground-water resources by region. Covers the 50 states, Puerto Rico, and the U.S. Virgin Islands.
USGS - Arsenic in ground water of the United State
Publications, maps, and data on arsenic in U.S. groundwater.
USGS -- Water Resources of the United States
Information about water resources from the U.S. Geological Survey. Topics include ground water, surface water, water use, water quality, acid rain, toxic substances hydrology.
Watershed Information Network
EPA guide to information and services for protecting and restoring water resources. Includes state and local watershed information.