U.S. Geological Survey:
Water Resources of the United States
Excellent resource information that provides background as well as current information on water topics.
Water Environment Federation
Technical information and a world of interesting links.
Trade Journals and Magazines
WaterandWasteWater listing of featured trade journals and magazines.
Try this direct link to their calculating tools:
Water Online Calculating Tools
A fountain of information for those involved with local government can be found at this site.
The American Water Works Association
This site contains a plethora of information pertaining to the water and wastewater industry.
Water Quality Association
Order your home Water Awareness Kit for $5.00 here.
International Water Association
New site for news and articles on the water industry worldwide.
Check your local drinking water quality at this site.
The single best source for facts on the NET