California Code, Public Resources Code - PRC § 5542

A district may exercise the right of eminent domain to take any property necessary or convenient to accomplish the purposes of this article.

A district may not acquire by condemnation any of the lands, properties, or facilities of any municipal utility district which are appropriated to public use or are used in or are useful to the operations of the municipal utility district or which are within the watershed of any stream or reservoir which supplies water for domestic use or which the directors of the municipal utility district determine by resolution to be properties which are required for the purposes of the municipal utility district.