Drinking Rain Water
Ask a scientist: why can't I drink rain water?
http://www.newton.dep.anl.gov/askasci/wea00/wea00044.htm

Rainwater Harvesting
information on the history of water harvesting methodologies in Tamilnadu and the modern methods adopted for rain water harvesting structures and advised by TWAD Board for both the individuals & professionals.
http://www.aboutrainwaterharvesting.com/

Rain Water System Design Report
Report on rain water system designs for the new environmental science and engineering building at the University of Waterloo, Canada.
http://www.adm.uwaterloo.ca/infowast/watgreen/projects/library/760/final.html

USGS -- Water Resources of the United States
Home page for water resources information from the US Geological Survey
http://water.usgs.gov/

Clean the Rain, Clean the Lakes: Mercury in Rain Is Polluting The Great Lakes
Mercury runs many processes in our lives but we must take a stand to prevent mercury pollution because it can adversely affect wildlife and people's health.
http://www.nwf.org/mercury/

Rain Barrel Information and Sources
Read how to set up rain barrels to reduce your consumption of public water and save money, and where to buy them. Rain barrels help leave water in tapped streams so aquatic creatures can survive through drought.
http://dnr.metrokc.gov/wlr/PI/rainbarrels.htm

Van Essen Instruments
Offers water monitoring products including ground water, rain water, and sewage system overflow sensors.
http://www.vanessen.com

Energy Management and Control
Save money by not paying for hot water you don't need. Our systems monitor and control hot water usage so you only heat water when you need it.
http://savehotwater.com

Gramm Environmental Limited
Gramm - Water our planet’s most precious resource rain water harvesting, rain water systems, grey water systems, rain harvesting, rain water harvesting, rain water, water recycling systems, Water Recycling Systems, Rain Water Systems, Grey Water Recycling, Grey Water , Systems, Reclaimed Water, enviromental, inviromental, environmental products, Environmental Products, waste water, water products, water treatment, re claimed , water, recycled water, green products, invironmentally friendly, environmentally friendly, air conditioning controls, energy savings, water storage, water tanks, rain water harvesting, rain water recycling, rain water collection, rain water storage, rain water reclamation grey water, bath water, no- potage, shower water, secondary water, refridgeration controls, water matters, rain water matters, grey water matters, water
http://www.grammenvironmental.com/

S. S. Exploration Enterprises
Services in groundwater exploration, recharge, rain water harvesting, roof water harvesting, and tube well drilling. Based in India.
http://www.hydroexplore.com/