Clean water is an issue around the world. Charles J. Vorosmarty writes a great article about the issues the world is facing around the world with poor water quality.
Exposure to unsafe drinking water and inadequate sanitation results in 3.4 million deaths, mostly children, each year from diarrhea. In the U.S more than 200 million people live within 10 miles of degraded fresh water. In Australia the town of Brisbane was down to a 6 hour supply due to clogged pipes from sediment washing down from a poorly managed land upstream.