Record heat threatens Emilia's dairy belt as Po River dries in June peak

Italy's longest river, the Po, is running dry as a record heatwave sweeps across Europe, with seawater beginning to intrude inland and threatening the farming heartland that produces the milk for Parmigiano Reggiano cheese. According to the Guardian's reporting on Saturday, Germany and Italy endured sweltering conditions as temperatures broke records above 40 degrees Celsius across the continent, with the weather system linked to dozens of deaths in western Europe.

The World Health Organisation reported on Sunday that over 1,300 excess deaths had been recorded in Europe since June 21 in connection with the heatwave. Most of Italy remained under red alert as the extreme conditions persisted into this week, with relief forecast only for Wednesday. The drought threatens not only water supply for irrigation but also the quality and quantity of milk from dairy herds in Emilia-Romagna, where heat stress reduces lactation and milk composition.

The Po's decline is acute during June and July, when Parmigiano Reggiano production peaks. Dairy farmers in the region depend on consistent water supply for cattle cooling and pasture irrigation; saltwater intrusion into the aquifer raises the salinity of groundwater used for both. The combination of reduced rainfall, elevated temperatures, and saline contamination creates a three-fold pressure on milk yield precisely when demand from global markets is highest.

Emilia-Romagna's cooperative dairy system, which aggregates milk from thousands of small producers into consortiums that manage the Parmigiano designation, is built on volume and consistency. Heat-stressed herds produce less milk and milk with altered protein composition, both of which affect cheese quality and yield. A prolonged drought during the peak season could force production cuts and undermine the region's ability to meet export contracts.

The heatwave's broader European toll—with deaths mounting across the continent and health services warning of saturation—underscores the scale of the climate stress now affecting agricultural production. Italy's longest river, once taken for granted as a reliable source, is becoming a barometer of the region's vulnerability to extreme weather. How quickly the heat breaks, and whether summer rainfall restores the Po, will determine whether this peak season becomes a crisis for one of the world's most protected food names.