Sewer gas Sewer gas Sewer gas is a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage. Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides. Improper disposal of petroleum products such as gasoline and mineral spirits contribute to sewer gas hazards. Sewer gases are of concern due to their odor, health effects, and potential for creating fire or explosions. Sewer gas is typically restricted from entering buildings through plumbing traps that create a water seal at potential
Hospital Hill fire miles away because of the gas fire on Hospital Hill. Although the fire at the borehead was not a direct threat to the town of Roma, there was a fear that a nearby gasometer, which stored the town's supply of gas, would ignite. When gasometers are full, excess gas must be allowed to escape as a safety measure. The Roma gasometer was full and the excess gas was venting only 250 feet from the fire. If the venting gas came into contact with the flames it would have ignited and caused the entire gasometer to explode. Decisive action was needed