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15. Purfresh

VC Funding: $56.2 million
Employees: 41
Headquarters: Fremont, Calif.
Founded: 1996

Purfresh offers a range of solutions that purify, protect and preserve food and water. Growers use its products to keep food fresh on the way to store shelves, and bottlers use it to sterilize the plastic bottles before they put in the water. Coca-Cola (KO), Procter & Gamble (PG) and Safeway (SWY) are among the Purfresh's customers.

Photo: Wataru Yanagida | Photodisc | Getty Images