The season begins on March 1, 2010 and ends with the Championship meet on July 10, 2010. Registration typically begins in February. Visit any of the 10 teams’ websites for more information.

The Marin Swim League (MSL) is a summer league dedicated to providing and preserving quality amateur competitive swimming events for its subscribing membership. The MSL fosters and promotes the ideals of good sportsmanship, fair play and good fellowship for participants of all ages and abilities in an environment that nurtures self-esteem in all the children it serves.