The landmark Rights of Nature case for the Machángara River in Quito, Ecuador, is examined. Long degraded by untreated wastewater, industrial discharges, and urbanization, the Machángara River became the focus of a citizen-led lawsuit supported by scientists, academics, and indigenous representatives. In 2024, an Ecuadorian court recognized the river as a rights-bearing entity and ordered the municipality to implement a 27-point restoration plan. The case demonstrates how Rights of Nature offers a more effective legal strategy than traditional loss-and-damage claims, correcting power asymmetries, expanding legal standing, and shifting the burden of proof from plaintiffs to authorities responsible for environmental protection. The ruling catalyzed public awareness, institutional learning, and political commitments, culminating in a November 2025 pledge by the mayor to clean Quito’s rivers by 2040. It also sparked new governance structures, such as community groups tasked with monitoring compliance, and encouraged discussion of nature-based solutions despite municipal resistance. The Machángara case highlights the potential of Rights of Nature to transform urban environmental governance by integrating science, community action, and legal innovation, positioning Quito once again as a global reference in watershed protection.