If the owner so notified shall not comply with the notice or order of the board of health having primary jurisdiction hereunder within the time specified, the board shall proceed to remove the nuisance and make the necessary repairs, bill the owner therefor, and, if necessary, to recover the expense in a civil action against the owner. The unpaid expense of the board shall become a lien on the real property immediately upon removal of the nuisance and completion of necessary repairs.
N.J.S. § 24:14A-9