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It's a low-cost commodity, but make no mistake--there's money to be made in water. Water entrepreneurs are problem solvers who look at global issues like water scarcity and failing infrastructure and see opportunity.

The EPA took another step toward tightening oversight of hydraulic fracturing today, announcing it would initiate a process to set national rules for treating wastewater discharged from gas drilling operations. Until now, the agency has largely left it to states to police wastewater discharges. Some have allowed drillers to pump waste through sewage treatment plants that aren't equipped to remove many of the contaminants, leading to pollution in some rivers and to problems at drinking water facilities.

More than 6,000 chemicals pollute U.S. drinking water, yet the U.S

Sand is a cheap and easy to find water filter. It's also not a very good water filter