The Martinez Community Swim Team welcomes you to our 2025 swim season! We are very excited to see our returning swimmers back in the water and welcome our new Otters to the MCST family! The Otters have been an active part of the Martinez community since 1980. We look forward to another great season in the beautiful Rankin Aquatic Facility in downtown Martinez. Our team has grown substantially over the past several years with the help of an experienced volunteer parent board of directors and a well qualified professional coaching staff. Please continue to monitor our website for information about sign-ups or reach out to head coach Keelan Kirshen or any member of the Board for information. Go Otters! MCST Otters: The 2012-2023 Tri County Swim League Champions.