Section 30. Prohibition Against New Illegal Structures. —

It shall be unlawful for any person to construct any structure in areas mentioned in the preceding section.

After the effectivity of this Act, the barangay, municipal or city government units shall prevent the construction of any kind of illegal dwelling units of structures within their respective localities. The head of any local government unit concerned who allows, abets or otherwise tolerates the construction of any structure in violation of this section shall be liable to administrative sanctions under existing laws and to penal sanctions provided for in this Act.