If SUBROGATION IS WAIVED, subject to the terms and conditions of the policy, certain policies may require an endorsement. You have no legal obligations to respond to a subrogation letter.A Subrogation Letter should clearly state the facts of the case, including details of the incident (e.g. Name Of Additional Insured Person(s) Or Organization(s):. The City of Riverside, its officers, employees and agents are added as additional insureds. Information required to complete this Schedule, if not shown above, will be shown in the Declarations. Subrogation is an arrangement between insurance companies to prevent insured parties from receiving double compensation. Subrogation is an insurer's right to recover payments made to you under your insurance policy from a third party who is at fault for the loss. Additionally, a Waiver of. Your insurance company will likely want you to sign a subrogation release form.