Once known as the "richest hill on Earth" for its wealth of mineral deposits, Butte became the first major city in Montana thanks to the boom of copper mining. But early 20th century mining practices led to serious environmental consequences, including contaminated local groundwater unfit to drink. The city’s new Basin Creek Water Treatment Plant has become a source of civic pride, showing off some of the flashiest technology in the drinking water industry. But on top of many engineering firsts, the facility’s story is rooted in the rich history of Butte.