PEN §554: Any property, except that portion of such property to which the general public is accorded access, may be posted against trespassing and loitering in the manner provided in Section 554.

Any property, except that portion of such property to which the general public is accorded access, may be posted against trespassing and loitering in the manner provided in Section 554.1, and thereby become posted property subject to the provisions of this article applicable to posted property, if such property consists of, or is used, or is designed to be used, for any one or more of the following: (a) An oil well, oilfield, tank farm, refinery, compressor plant, absorption plant, bulk plant, marine terminal, pipeline, pipeline pumping station, or reservoir, or any other plant, structure, or works, used for the production, extraction, treatment, handling, storage, or transportation, of oil, gas, gasoline, petroleum, or any product or products thereof. (b) A gas plant, gas storage station, gas meter, gas valve, or regulator station, gas odorant station, gas pipeline, or appurtenances, or any other property used in the transmission or distribution of gas. (c) A reservoir, dam, generating plant, receiving station, distributing station, transformer, transmission line, or any appurtenances, used for the storage of water for the generation of hydroelectric power, or for the generation of electricity by water or steam or by any other apparatus or method suitable for the generation of electricity, or for the handling, transmission, reception, or distribution of electric energy. (d) Plant, structures or facilities used for or in connection with the rendering of telephone or telegraph service or for radio or television broadcasting. (e) A water well, dam, reservoir, pumping plant, aqueduct, canal, tunnel, siphon, conduit, or any other structure, facility, or conductor for producing, storing, diverting, conserving, treating, or conveying water. (f) The production, storage, or manufacture of munitions, dynamite, black blasting powder, gunpowder, or other explosives. (g) A railroad right-of-way, railroad bridge, railroad tunnel, railroad shop, railroad yard, or other railroad facility. (h) A plant and facility for the collection, pumping, transmission, treatment, outfall, and disposal of sanitary sewerage or storm and waste water, including a water pollution or quality control facility. (i) A quarry used for the purpose of extracting surface or subsurface material or where explosives are stored or used for that purpose.