Assistance granted under this chapter shall not be transferable or assignable, at law or in equity, and none of the money paid or payable under this chapter shall be subject to execution, levy, attachment, garnishment or other legal process or to the operation of any bankruptcy or insolvency law, with the exception that the State shall seek recoupment for overpayments. Such recoupment may not exceed an amount which will result in the assistance unit's retaining from its combined aid, income and liquid resources, less than 90% of the amount payable under the State Plan to a family of the same composition with no other income. Recoupment must be made in accordance with applicable federal laws and regulations. The Department shall publish regulations establishing the recoupment rate at any time when there is a change.