Belgium Heatwave: 2,000 Deaths, Water Crisis, and Coastal Dangers
Belgium is confronting one of its most severe environmental crises on record as a devastating heatwave, persistent drought, and coastal safety emergencies converge. New data from the Belgian health institute Sciensano reveals that over 2,000 excess deaths occurred during and after the June heatwave, making it the deadliest since measurements began in 2000. Simultaneously, the province of Antwerp has expanded its water pumping ban to the entire region, while lifeguards along the Belgian coast have rescued 53 swimmers in the first two weeks of July alone.
Record Mortality: The Deadliest Heatwave on Record
The June 2026 heatwave, which brought seven tropical days above 30°C and exceptionally warm nights, has proven catastrophic. Sciensano reported that excess mortality reached 48% — a sharp upward revision from the initial estimate of 1,747 deaths. The health institute extended its monitoring period by two days after discovering that mortality remained significantly elevated on days four and five following the heatwave.
“The increase has two causes,” Sciensano explained. “Some deaths are registered late. Moreover, Sciensano extended the period by two days because excess mortality was significantly higher than expected on days four and five after the heatwave.” The institute noted that this “lag effect” is observed in other countries as well, where people continue to die from heat-related causes even after temperatures subside.
Stark regional disparities have emerged. Wallonia was hardest hit with 77% excess mortality (1,059 deaths), followed by Brussels at 63% (188 deaths), and Flanders at 31% (768 deaths). Critically, the heatwave affected all age groups, including hundreds of excess deaths among those under 65.
Drought Deepens: Water Bans and Code Orange
As the heat persists, Belgium’s drought crisis is intensifying. Flanders was placed under code orange — a “phase of effective water scarcity” — by the Drought Commission on July 16, marking the second-highest alert level. Groundwater levels have dropped sharply, with approximately 70% of monitoring stations reporting low to very low readings for this time of year.
On July 17, Antwerp Governor Cathy Berx expanded the water pumping ban (oppompverbod) to the entire province, prohibiting the pumping of water from non-navigable waterways and public ditches. From July 22, a complete water extraction ban will take effect on navigable waterways in the IJzer basin, with restricted lock passage for pleasure craft.
Climate scientist Inne Vanderkelen of KU Leuven and the Royal Meteorological Institute explained the mechanism: “It is the combination of little precipitation and high evaporation that causes soils to dry out faster.”
Looming European Water Conflicts
The drought extends well beyond Belgium’s borders. June 2026 was the hottest June on record for Western Europe, with temperature records broken in at least 14 countries, according to the Copernicus Climate Change Service.
Hydrologist Niko Wanders of Utrecht University warned that without updated international agreements, tensions could rise between European countries over scarce river water from transboundary rivers like the Meuse and Rhine. “The Netherlands is at the very back, a bit in the drainpipe,” Wanders said. “A conflict between the Netherlands and Flanders over water in the Meuse would not be desirable.”
The Meuse River Agreement, signed in the 1990s between Belgium and the Netherlands, is increasingly outdated as climate change creates conditions beyond its original parameters. Wanders called for the European Commission to take the lead in establishing new frameworks for transboundary water management.
Coastal Crisis: 53 Rescues and a Fatal Drowning
Along the Belgian coast, the combination of spring tides, strong winds, and warm weather has created dangerous conditions. In the first two weeks of July, lifeguards rescued 53 swimmers, 10 of whom were in unguarded, forbidden zones. A 44-year-old French man died after swimming in an unguarded zone in Knokke-Heist.
“The message not to do it has been said so many times,” said Dries Hautekiet, head lifeguard in Knokke-Heist. “Our guidelines are not there to annoy people. They are for everyone’s safety. The sea is and remains treacherous and dangerous.” His colleague Tom Cocle, head lifeguard in Blankenberge, added: “Every year it’s not a question of if something will happen, but where and when. That is a painful but realistic observation.”
What Lies Ahead
While temperatures are expected to ease slightly, no significant rainfall is forecast, meaning the drought is likely to deepen. The Drought Commission will continue coordinating measures, with potential further restrictions on water use for agriculture and shipping. The staggering regional disparity in heatwave mortality — Wallonia suffering more than double Flanders’ rate — raises urgent questions about infrastructure readiness, public health communication, and social vulnerability that policymakers must address before the next extreme weather event arrives.