Surfers Against Sewage is an environmental charity established in 1990 by surfers in Cornwall to improve water quality. They campaign on issues like marine litter, sewage pollution, toxic chemicals, and coastal development through community action, volunteering, education, and research. SAS is funded through donations and run by voluntary trustees. They have successfully campaigned against issues like plastic pellets called "Mermaid's Tears" on beaches and helped implement solutions through partnerships with plastic manufacturers. Their ongoing goals include further reducing marine pollution and protecting coastal environments.