Fatbergs are ‘the bane of utilities’ existence’—they exist because many cities take for granted an essential but largely hidden public health tool: urban sewers. In this episode, Natalie Exum, Assistant Scientist in the department of Environmental Health and Engineering, and Baltimore Harbor Waterkeeper Alice Volpitta of Blue Water Baltimore, a nonprofit that serves as a watchdog for the city’s water systems, about the immovable clogs that threaten public health in cities across the globe—and what we do about it.