Hannah Escalante, a student at the College of Charleston, performs water quality tests at a salt marsh Monday, Oct. 6, 2025, in Charleston, S.C. (AP Photo/Joshua A. Bickel) by: Danika Young Posted: Jun 11, 2026 / 06:10 PM EDT Updated: Jun 11, 2026 / 06:10 PM EDT CHARLESTON, S.C. (WCBD) – World Saltmarsh Day is annually celebrated on June 11 as a day to celebrate the superpowers of the amazing wetland habitat.