Water Code § 72088

After the exclusion of territory from the improvement district pursuant to this division, all taxes levied for the carrying out of the improvement district’s purpose shall be levied exclusively upon the taxable property in the improvement district as then constituted, except that taxes shall continue to be levied upon the taxable property in the territory excluded for the payment of principal and interest on any outstanding bonds of the improvement district, if the board so determines in the resolution of exclusion.