For Clean and Healthy Sewage we treat the Water to minimize H2O Hydrogen sulfide gas (H2O) is also known as "sewer gas" because it is often produced by the breakdown of waste material. At low levels, hydrogen sulfide gas has a strong odor similar to rotten eggs. At higher levels, hydrogen sulfide gas can make you sick and could be fatal. Hydrogen sulfide gas is present in every sewage system with different levels of concentration. We can reduce the gas to minimize impact to both nature and the sewage system itself.