Septic Smell

Gases which can accumulate in the septic tank or any other anaerobic environment include; hydrogen sulfide (H2S), chlorine (Cl2), carbon monoxide (CO), carbon dioxide (CO2) and methane (CH3). Hydrogen sulfide has a characteristic smell of rotten eggs and can form sulfuric acid that can corrode metal and concrete and remove paint.

As a gas, it can paralyze the human respiratory system. Chlorine gas can accumulate in the septic tank. It is heavier than air and can cause respiratory distress and suffocation. Since gas masks do not offer protection against chlorine, SCBA equipment is required.

Carbon dioxide and carbon monoxide are both colorless, odorless and can cause asphyxiation. Methane, an explosive gas, is given off by the anaerobic bacteria and can cause suffocation.