Cal. Wat. Code § 75832
For the purpose of discharging the outstanding indebtedness at the time of the filing of the petition for exclusion of lands, the lands excluded shall be deemed and considered as part of the district the same as though the petition for its exclusion had never been filed or the order of exclusion never made.
All provisions which may have been resorted to to compel the payment by such lands of their quota or portion of such outstanding obligations had such exclusion never been accomplished, may, notwithstanding such exclusion, be resorted to to compel and enforce the payment on the part of such lands of their quota or portion of such outstanding obligations for which they are liable.
Such lands shall not be held answerable or chargeable for any obligation of any nature or kind whatever incurred after the filing with the board of the petition for the exclusion of such lands from the district.
Ca. Water Code § 75832