A pureplay in the purification-of-water sector is Calgon Carbon Corp (CCC). Their products are used to remove organic compounds from water, air , and other liquids. The company is ramping up their profitability with analysts expecting the company to go from losing money last year to 16 cents a share earnings this year and 30 cents a share in earnings the year after.

a company that normally provides its services to the oil and gas industry but has also developed an expertise in clean water treatment is engineering and construction company, Jacobs Engineering (JEC), which has a subsidiary devoted to providing the project management, engineering, and materials for providing potable water to areas. Because of their exposure to the oil and gas industry they count among their investors one of the greatest investors ever, T. Boone Pickens. The companies earnings are expected to go from $1.61 per share in 2006, to $2.22 per share in 2007 to $2.57 per share in 2008, giving them a forward P/E of slightly above 20 and solid double digit growth each year. They've beaten analyst estimates for the past four straight quarters. JEC is also in a recent Cramer portfolio from Mad Money, Cramer's Go-To Stocks where he states that earnings estimates for JEC, and others on his list including QCOM and FWLT, are way too low for the year.

GE also has a subsidiary for manufacturing the chemicals and equipment for treatment of water and process systems. GE is owned by, amng others, value investors such as Warren Buffett amd David Dreman. Click on the above links to see their top holdings.

Makes the pipes for water transmission.

provides environmental services (i.e. they clean up the mess everyone else dumps)

engages in the development, manufacture, and marketing of patented water technologies worldwide

engages in the development, manufacture, and marketing of antibody products and analytical test kits for a range of food, water, agricultural, industrial, environmental, and scientific applications in the United States and internationally. It primarily focuses on immunology, proteomics, bio-luminescence, and other bio-reactive technologies.

their Fluids segment has wastewater treatment and handling products.