N.J. Stat. § 26:1A-18

The commissioner shall exercise general supervision over all matters relating to sanitation and hygiene throughout the State. Whenever in the opinion of the commissioner it is necessary or advisable, a sanitary survey of the whole or of any part of the State shall be made. The commissioner may enter upon, examine and survey any source and means of water supply, sewage disposal plant, sewage system, prison, public or private place of detention, asylum, hospital, school, public building, private institution, factory, workshop, tenement, public wash room, public rest room, public toilet and toilet facility, public eating room and restaurant, and also any premises in which he has reason to believe there exists a violation of any health law of the State, any provision of the State Sanitary Code, or any law which he has the duty of administering. L.1947, c. 177, p. 802, s. 18.