California Code, Government Code - GOV § 20684

For each local safety member subject to Section 21370, effective on January 1, 1985, or later date of entrance into this system as such a member, the normal rate of contribution shall be 7 percent of compensation.

The normal rate of contribution as established under this section for a local safety member whose service is included in the federal system and whose retirement allowance is reduced pursuant to Section 21370 because of that inclusion shall be reduced by one-third as applied to compensation not exceeding four hundred dollars ($400) per month for service rendered after the date of execution of the modification of the federal-state agreement including services in the federal system and prior to termination of his or her coverage under the federal system.

The operative date of this section with respect to a local safety member shall be the date upon which the local safety member becomes subject to Section 21370.