Cal. Water Code § 75850

The boundaries of a district may be changed to include additional land within the district as provided in this chapter, and the inclusion within a district of any land not contiguous thereto shall be deemed to effect a change of the boundaries of the district. No such change in the boundaries of a district shall impair or affect its organization, or its right in or to property, or any of its rights or privileges of whatsoever kind or nature; nor shall it affect, impair, or discharge any contract, obligation, lien, or charge for or upon which the district was or might become liable or chargeable had such change of its boundaries not been made.