Wallonia Flooding: Waters Exceed 2021 Disaster Levels

Catastrophic flooding has struck the Basse-Sambre region of Wallonia after torrential rainfall on Saturday, May 30, 2026, with water levels in some areas exceeding those of the devastating 2021 “water bomb” disaster. The towns of Jemeppe-sur-Sambre and Auvelais have been particularly hard hit, leaving approximately 20,000 residents without drinking water and forcing the closure of schools and daycare centers.

Unprecedented Rainfall and Emergency Response

The storms, which began in the late afternoon on Saturday and intensified through the evening, dumped the equivalent of over a month’s rainfall in a single day. Climatologist Sébastien Doutreloup told L’Avenir that approximately 140 mm of rain fell in just a few hours, compared to Belgium’s monthly average of 70 mm. Meteorologist Pascal Mormal of the Royal Meteorological Institute (IRM) described the storm sequence as “probably the most devastating in the last 10 years, except for the historically tragic period of mid-July 2021,” as reported by DH Les Sports+.

Emergency services were overwhelmed. Colonel Marc Gilbert of the Val de Sambre fire brigade zone reported 750 interventions — a figure he described as unprecedented in his 50-year career. “The Walloon Region had announced an orange zone until 3 AM. I can tell you it was not at all orange, but red,” he told L’Avenir. Approximately 55 to 60 firefighters were mobilized across the affected zone.

Water Crisis Deepens

A critical secondary crisis emerged when the Onoz pumping station was flooded and a high-voltage cabinet was damaged, cutting off the water supply to approximately 20,000 residents in Jemeppe-sur-Sambre and Sambreville. Benoît Moulin, spokesperson for the Walloon Water Company (SWDE), confirmed that the pumping station was “noyée” (flooded) during the overnight floods and is now out of service, as reported by L’Avenir. Tanker trucks have been deployed to set up water distribution points, with authorities hoping to restore normal service by Tuesday morning, June 2.

RTBF reported that the majority of schools and daycare centers in Auvelais and Velaine-sur-Sambre remained closed on Monday, June 1. Mayor Olivier Bordon of Sambreville assured residents via social media that municipal services remain fully mobilized alongside SWDE to mitigate the consequences.

Personal Tragedy: Photographer Loses Life’s Work

Among the many personal stories of loss, the case of Dirk Leemans, a Leuven-based photographer, has drawn particular attention. Leemans watched helplessly as his studio filled with water and mud in barely an hour. “Half the studio was flooded, but in the lower rooms, where all my equipment is, the water reached the ceiling. Computers, screens, hard drives and professional lights were completely damaged,” he told VRT NWS. The damage is estimated at several hundred thousand euros. “Everything I have is gone,” he said.

Recurring Vulnerability and Climate Concerns

The flooding marks the third major inundation to hit the Basse-Sambre region in five years, following the catastrophic July 2021 floods — which killed 39 people in Belgium — and further flooding in July 2025. Residents expressed despair at having to rebuild yet again. “In 2021, we had to redo everything. And now, here we go again!” one resident told L’Avenir.

The intensity of the storm — with approximately 50,000 lightning strikes recorded across Belgium — aligns with patterns expected under climate change, where warmer air holds more moisture, leading to more intense precipitation events. An industrial fire in Sombreffe’s industrial zone was also reported as a secondary consequence of the storms.

What’s Next

Authorities are working to restore water supply by Tuesday morning while continuing damage assessments across the affected municipalities. Questions remain about whether the flooding will be officially recognized as a natural disaster for compensation purposes, and what long-term flood prevention measures will be implemented given the region’s recurring vulnerability. The full economic cost of the damage is not yet known, but with hundreds of homes affected and critical infrastructure compromised, it is expected to run into millions of euros.