This study is the first LCA of superhydrophilic membranes for oil-water separation. It compares two membrane-fabrication routes using a "cradle-to-gate" approach, which includes resource extraction (cradle) to membrane fabrication (i.e., at the factory gate, ready for shipment/use) and excludes the membrane use phase. This study aims to: (1) evaluate the resource demands and associated environmental impacts for the two fabrication routes; identify the environmental hotspots (e.g., process, material, and energy) in each route; and (3) suggest strategies to reduce these impacts. Our work provides new insights into the development of green membranes for oil-water separation.