EPA Office of Water - (has games, activities, & experiments forkids)
Project Wet - (has water education activities for kids & parents)
Massachusetts Water Resources Authority
Water Science Glossary of Terms
Classroom Activities & Experiments http://www.epa.gov/safewater/kids/exper.html
Water for Kids http://www.epa.gov/ow/kids/waterforkids.html
How NASA Studies Water http://kids.earth.nasa.gov/water.htm
Water on the Space Station http://kids.msfc.nasa.gov/news/2000/news-stationwater.asp
Water What-ifs http://www.ncsu.edu/sciencejunction/depot/experiments/water/
Science Fair Studio http://school.discovery.com/sciencefaircentral/scifairstudio/ideas.html#water
Droplet and the Water Cycle http://kids.earth.nasa.gov/games/
Water Science for School http://ga.water.usgs.gov/edu/
http://ga.water.usgs.gov/edu/links.html
Water in The City http://www.fi.edu/city/water/water.html
What is Water? http://www.seaworld.org/Water/whatisit.html
http://www.epa.gov/OGWDW/kids/
http://www.des.state.nh.us/wet/
http://water.usgs.gov/education.html
http://k12science.ati.stevens-tech.edu/curriculum/waterproj/
http://www.epa.gov/kids/water.htm
http://mbgnet.mobot.org/fresh/index.htm
http://imc.lisd.k12.mi.us/msc1/invert/inverts.html
http://www.seacentr.org/programs/school_program.html
http://www.neaq.org/scilearn/kids/index.html
http://www.waterinfo.org/cnsrv.html
http://dmoz.org/Science/Environment/Water_Resources/Drinking_Water/
http://www.highlinewater.org/kid's1.htm