Sewage-smelling water flowed into the Danube in northern Budapest for at least three days before the leak was stopped, raising concerns about water pollution and potential health risks. The cause of the discharge near Óbuda remains under investigation.
Sewage flowed into the Danube for days
The pollution was first noticed on 21 October near the K Bridge on Mozaik Street, close to the entrance to Hajógyári Island in Budapest’s third district. Witnesses reported cloudy water with a strong sewage odour pouring continuously from a drainage outlet into the river. Initial reports estimated that several tens of litres were entering the Danube every second, reports Blikk.
Local residents reported the incident to the Budapest Sewage Works (Fővárosi Csatornázási Művek), the company responsible for the capital’s sewerage network. The utility responded on Saturday, inspecting the area around the Mozaik Street sewage pumping station and successfully stopping the discharge. However, the precise cause has not yet been established. According to the company’s response, a substantially smaller quantity of treated water was flowing into the Danube following the intervention.
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Investigators examine possible causes
Water management engineers have suggested that the discharge could have originated from a damaged sewer or a property not connected to the public sewerage network. Another possibility is that wastewater from buildings constructed after the area’s last major sewerage developments was never properly connected to the system.
No major public sewer construction or renovation project has taken place around Mozaik Street in recent years, according to the reports. Between 2013 and 2015, however, approximately 19 kilometres of sewerage infrastructure were renewed in Budapest’s third district as part of the Budapest Complex Integrated Wastewater Management Project.
The location of the discharge has prompted particular concern because the Danube supplies water to communities further downstream. Although the outlet was reportedly well below the capital’s drinking-water abstraction sites, residents warned that pollution entering the river could affect other settlements. It remains unclear whether the water contained untreated domestic sewage, and the investigation has yet to establish the source of the contamination.
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Health risks from contaminated water
Untreated domestic wastewater can contain pathogens originating from human waste and contaminated household water. Exposure through swallowing polluted water or direct contact can cause gastrointestinal infections and other illnesses.
Zoltán Vincze, a specialist engineer in municipal wastewater management, warned that sewage can carry pathogens associated with diseases including hepatitis A and E, typhoid and cholera. The actual health risk from this particular incident, however, has not been established. While the immediate flow has reportedly been stopped, questions remain about what caused the leak, how long the contamination lasted and whether further action will be needed to prevent a similar incident.
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