US Masters Swimming is a non-profit organization for swimmers over 18. The organization provides insurance, SWIMMER magazine, sanctioned events, and many more services to its nearly 60,000 members.
They have 52 Local Masters Swimming Committees that support 1,500+ Masters Swimming clubs and workout groups.
Members do not have to compete if they do not wish to do so, but the option is available.
You also don’t have to be an expert swimmer, US Masters Swimming offers programs to help you get in shape and become a better swimmer.
To find out more about the organization and possibly join it, check out their website at usms.org.