Po river choked by algae as Turin battles heat and water stress

Euronews reported on Wednesday that Italy is intensifying efforts to clear thick algae from the River Po in Turin, where weeks of sustained high temperatures have accelerated the bloom's spread along the country's longest river. The algae accumulation poses a dual threat: it impairs navigation—a critical concern for river commerce and barge traffic that serves the industrial heartland of the North—and degrades water quality for the millions of residents and businesses that depend on the Po for drinking water and irrigation.

The algae crisis reflects the broader climatic stress bearing down on Piedmont and the Po Valley. The region has endured successive heatwaves throughout July, with temperatures repeatedly climbing toward 42 degrees Celsius, a pattern that accelerates algal growth in slow-moving water and exacerbates evaporation across an already depleted river system. Earlier reporting documented deepening drought conditions in the Po Valley, with northern Italy tightening water rationing as summer advanced. The current algae bloom is the visible consequence of that stress: warm water, reduced flow, and nutrient loading create ideal conditions for cyanobacteria and green algae proliferation.

For Turin and the surrounding industrial zone, the Po's degradation carries immediate economic implications. The river supports barge traffic that moves materials to and from the port of Alessandria and serves as a cooling resource for power plants and manufacturing facilities. Algae-choked sections reduce navigability and can clog intake screens at water-treatment plants, forcing costly remediation and operational disruptions. The Euronews report did not specify which sections of the river near Turin are most affected or detail the scope of the cleanup operation, but the urgency of the Italian response underscores the severity of the blockage.