This week The Naturalist takes you on a historical tour of New York City's water supply. From the early days in the 1700s when the city got its water from aqueducts from Croton and the Catskill mountains to today's modern high-tech testing and treatment system. Learn what makes New York water some of the cleanest and best in the nation and how hydrofracking could ruin all of that. This episode is sponsored Roberta's Pizza.