Governmental functions of federal, state and municipal governments are not subject to the provisions of this chapter. Governmental functions of the Town of Selbyville government are considered exempt from the provisions of this chapter. It is further provided that the provisions of this chapter shall not apply to the installation, construction or erection of Governmental buildings serving the public, including, but not limited to, public educational institutions, fire stations, post offices or other public or semipublic offices or buildings, municipal water towers, government office buildings, water storage tanks, water reservoirs, water pumping stations, water treatment plant, sewage treatment plants, sewage lift stations and sewage pumping stations.