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
Merrimack Valley gas explosions explosions through their website. The updates expressed sympathy over the "tragic incident" and the resulting death, as well as directing readers to shelters, and how to remain safe throughout the incident. Governor Baker, and Lawrence mayor Dan Rivera were later heavily critical of the response issued by Columbia Gas. On September 14, 2018, Massachusetts Governor Charlie Baker declared a state of emergency and appointed Eversource to evaluate and oversee the management of the gas distribution system in the affected area. While some residents remained in emergency shelters or stayed in hotels or with friends and family, others were gradually able