The Santa Cruz River, a vital waterway traversing Pima County, has made a decade’s worth of strides towards ecological health, according to the latest annual report by the Sonoran Institute, Pima County, and the City of Tucson. Dubbed “Ten Years of Clean Water,” the 11th annual Living River Report illustrates the river’s transformation since major wastewater treatment upgrades in 2014. Prior to these efforts, the river bore a greasy film with scarce signs of life, but today, it’s a bubbling hub for biodiversity.