Fifteen Midwestern towns and cities have sued the manufacturer of a popular weed killer over drinking water contamination. The weed killer atrazine, manufactured by Syngenta, is commonly used in Midwestern cornfields. The lawsuit was filed by towns and cities in Kansas, Illinois, Indiana, Ohio, Missouri and Iowa. Atrazine has been banned in the European Union since 2004, but here in the United States about 80 million pounds of atrazine is used each year. A recent study found that the weed killers can turn male frogs into females. The chemicals in the weed killer atrazine disrupt development and make frogs develop both male and female features.