Save the Sound is a regional environmental nonprofit organization dedicated to protecting and restoring the Long Island Sound ecosystem and its surrounding watersheds across Connecticut and New York. Originally established as the Connecticut Fund for the Environment, the organization has a history spanning over 50 years, marked by significant mergers that expanded its reach and capabilities. In 2019, it merged with Soundkeeper, a group focused on water quality monitoring and pollution watchdog efforts, integrating a network of volunteers, a dedicated water quality team, and legal support to enhance its advocacy. Headquartered in New Haven, Connecticut, Save the Sound employs a holistic approach combining law, science, engineering, and grassroots activism to address pressing environmental issues, working in partnership with communities, lawmakers, and allied organizations to ensure clean air, healthy water, and preserved natural habitats for people and wildlife.

The organization's mission centers on leading environmental action in the Long Island Sound region, fighting climate change, saving endangered lands, protecting rivers and the Sound from pollution, and restoring ecosystems through nature-based solutions. Key victories include spearheading Connecticut's adoption of California's clean car standards in 2004, passing the state's Global Warming Solutions Act in 2008 via grassroots campaigns, and serving on the Governor’s Council on Climate Change. Save the Sound has achieved numerous legal, legislative, restoration, and activist successes, such as enforcing environmental laws, removing aging dams to reconnect waterways, and rallying for protections like the Horseshoe Crab Protection Act. Its efforts extend to New York, including Westchester County, New York City, and Long Island, where it combats urban pollution, preserves shorelines, wetlands, and forests, and promotes sustainable policies amid federal retreats on environmental protections.

With a small but expert staff of lawyers, engineers, scientists, community organizers, and communications specialists, Save the Sound leverages public support, donations, and volunteer involvement to drive change. It maintains a broad toolkit for impact, from litigation and legislative advocacy to environmental monitoring, hands-on restoration projects, and public campaigns. The nonprofit's work underscores a commitment to regional environmental justice, ensuring that neighborhoods and natural places remain safe and resilient for future generations, while actively engaging in current issues like climate adaptation and biodiversity conservation.