** FILE ** A sign marks the Ashokan Reservoir in Shokan, N.Y., in this Dec. 19, 2007 file photo.
Generic over the counter medicines are seen in Philadelphia on Monday, Feb. 25, 2008.
As part of the advanced secondary treatment, at the Orange County Sanitation District, a settling basin is used to filter water before it's diverted into the ocean, Monday, Nov. 19, 2007, in Fountain Valley, Calif.
Duane Moser, an assistant research professor with Desert Research Institute, collects water samples from the Las Vegas Wash in Henderson, Nev., Thursday, Oct. 18, 2007.
The Ashokan Reservoir, part of New York City's water supply, is seen in Shokan, N.Y., Wednesday, Dec. 19, 2007.
Machinery at the barscreen building is used to remove trash from raw sewage at the Orange County Sanitation District, Monday, Nov. 19, 2007, in Fountain Valley, Calif.
flow splitter, a circular structure that adds oxygen to water, is shown at the River Mountains Water Treatment Facility in Henderson, Nev., Thursday, Dec. 6, 2007. The facility treats up to 300 million gallons of water from Lake Mead daily.
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