Norman residents living north of Robinson and east of I-35 may detect an unusual tang or waft of chlorine in their water supply, following the revelation of routine water tests that signaled the presence of total coliform bacteria. According to a statement on the City of Norman website, while E. coli was not found in additional testing; the area is being treated with an increased chloramine residual to address the issue.
Immediate steps were mandated by the officials, in partnership with the Oklahoma Department of Environmental Quality, to send additional chloramine through the affected pipelines and to flush the system. Residents, however, are not required to take any action as the authority conveys that the water remains safe to consume. Nonetheless, residents and local businesses could perceive a heightened scent or taste of chlorine resulting from these corrective measures.
Authorities are investigating the cause of the incident, focusing on infrastructure work by a private company as a potential factor. Coliform bacteria, commonly found in soil and surface water, can enter a water supply during pipeline installation. While not harmful themselves, these bacteria can indicate conditions that allow more dangerous pathogens to enter the system, according to the City of Norman website.
The local water supply primarily comes from public wells with lower chlorine levels compared to treated sources like Lake Thunderbird or Lake Stanley Draper. A new Groundwater Treatment Plant, included in the Norman ballot for Spring 2026, will add chloramine to the well water to meet industry standards. The Norman Utilities Authority is addressing a potential public health concern while working to maintain a reliable water supply for residents.
