A resident on East Las Vegas Street on the city's south side reported that the sewer gas problem began over Labor Day weekend. Two elderly family members who share the home and have health conditions reached him by phone while he was at work, and by the time he returned, the odor had driven them out of the house entirely.
The household aired out the space as best it could before Colorado Springs Utilities crews responded and determined that a rooftop vent had failed because its base had rotted away. The homeowner spent $250 of his own money on a replacement vent, but within about a week the odor returned and was worse than before.
Utilities crews then performed two smoke tests to understand how gas was moving through the system, and external sensors confirmed elevated sewer gas concentrations around the property. Colorado Springs Utilities subsequently told KRDO that the root cause was a surge in flow through a bypass pumping operation tied to an active wastewater project a few blocks to the east. Reducing that bypass flow brought the gas levels down.
Beyond adjusting the flow, crews dug up the sewer infrastructure near the residence, put in a backflow valve, and swapped out a fitting beneath the kitchen sink that is meant to stop gas from entering the home. The homeowner described the overall situation as "90% better" following those repairs.
Whether the nearby wastewater project has a firm completion date, and whether other households in the area have experienced similar effects, has not yet been reported.