Investing in water is an important and growing opportunity. Water is by far the world's most critical resource, and countries around the world, including the United States, are facing water scarcity. The water and wastewater treatment markets continue to grow, and public companies will continue to be part of the equation as they develop innovative solutions to address water crises. Investors can gain exposure to water through the stocks of individual water technology companies, such as Xylem and Badger Meter, or through water exchange-traded funds.