Water is essential for life, and like most invaluable resources, it's a big business as well.

Investors don't typically pay much attention to water stocks, as most water utilities are considered boring dividend stocks. They're reliable sources of cash flow, but the businesses are thought to be predictable.

However, that could be changing. Sources of natural water supply are drying up, which is causing communities big and small to look for new sources of fresh, drinkable water. One of the most common ways to process clean water, especially for coastal communities, is the use of desalination plants -- facilities that remove the salt from ocean water and treat it to make it drinkable.

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Source Fool.com