Bill Donahue takes a trip to Fallon, Nev., a town of 8,300 that has the highest level of arsenic in its drinking water of any town its size or larger in the United States. The town's municipal reserves contain arsenic levels of 100 parts per billion, more than twice the current EPA limits. "It sounds minuscule, but that 100 ppb is toxic enough...to pose a 2 percent cancer risk above the national norm to anyone who spends 30 years drinking it." Fallon is one of many towns that the Environmental Protection Agency hopes to bring into compliance. But Fallon officials and many residents are cynical that high arsenic levels are serious health threats, and they are not enthused about the $7 million to $10 million price tag of a filtration plant that would bring them into compliance.