On August 16, 2023, UPM received a notice about an alkaline leak in the storage area of its pulp mill in Paso de los Toros, Uruguay. This leak caused an unusual color change in the water and fish mortalities in a creek that runs through stream that crosses the mill site and surrounding area. Problems in the stormwater control pond in the mill’s chemical storage and discharge area were the root cause of this leak.
As a result of the leak, the creek experienced an increase in sodium hydroxide levels and, consequently, an increase in the pH of the water. The water quality was also affected at the point where the creek stream flows into the Rio Negro River, although to a lesser extent.
UPM took immediate corrective measures to address the situation and prevent future leaks. The company informed the environmental authorities and local residents about the incident and posted a statement on the UPM Uruguay website.
The pH levels in the affected water bodies returned to normal within days. UPM, in collaboration with the Uruguayan environmental authority DINACEA, conducted a thorough investigation to identify the causes and consequences of the incident. The company committed to implementing all required actions, including continuous monitoring, following the authorities’ guidelines. In addition, preventive measures were implemented to avoid future similar incidents. UPM expects possible monetary sanctions that the authorities may impose in accordance with Uruguayan law.
The company stated it deeply regrets this incident and considers it of the utmost importance. UPM maintains rigorous environmental management processes, strict controls and constant monitoring in all its operations worldwide, and this type of incident is rare in its history.
