Per the CMSL bylaws
a. Membership in the Corporation shall be limited to those pools or pool organizations which maintain outdoor swimming facilities primarily organized for family recreational swimming during the summer months. Only children of dues-paying full-family members of such pools or pool organizations shall be eligible to swim in CMSL competition. A "full-family membership" shall be defined as one which entitles the head of a household, his or her spouse if residing at the address, and all children between the ages of 4 and 18 years inclusive, also residing at the address, full use of the swimming facilities without the payment of any additional dues or fees. This does not preclude the payment of additional fees for participation on the swim team which may be required by the pool organization or swim team. Further, no pool or pool organizations shall have any rules or regulations which would in any way prohibit or discriminate against the child of any such full-family member so as to preclude the child from swimming in CMSL competition. Any exceptions to the above requirements must be approved by the Board of Directors by a simple majority.