After all bonds issued by a commission to finance the acquisition of a project, and all obligations to the holders of any such bonds, have been fully met and discharged, the commission shall retain and have sole control and charge of such project, in trust however, for the contracting municipalities in the same manner and to the same extent as if the project were a water supply or water supply system acquired and constructed under the original act.
N.J.S. § 58:5-42