There is a growing desire among global investors to hold specialized commodities, in particular a commodity -- water -- that many in the U.S. may not even think of along with gold, oil or soybeans.

Water resource service providers are bundled for safety in one ETF.

Aging water infrastructure and booming global population mean long-term investors would be wise to shift their portfolios.

The Dow Jones US Water Utilities Index has quietly rallied 20% rally in a month. This is now a viable sector for investment again.

Water stocks aren't making headlines right now, but investors should plan for tomorrow. We examine three lesser-known companies.