Vivaqua warns heat and drought are straining Brussels water supplies

Vivaqua warned in Brussels on Thursday 13 August 2026 that the combination of drought and the heatwave was putting pressure on water availability, while the capital’s drinking-water network continued to operate without an announced restriction, according to La Dernière Heure and the latest published regional guidance. Updated: 17 August 2026, 12:00 CEST.

The warning sharpens a call for restraint already issued by the Brussels Regional Drought Unit. Brussels Environment said the unit activated its yellow vigilance level on 22 July after reviewing rainfall, waterways, groundwater, canal levels, drinking-water supply and fire risk with Vivaqua, the Port of Brussels and safe.brussels. The authority asked households, businesses, public bodies and sports clubs to postpone non-essential uses, including washing cars, filling swimming pools, cleaning outdoor surfaces and watering lawns.

At the start of the alert, public supply remained normal across the region, according to Brussels Environment. The authority said Vivaqua was prepared to take measures if dry conditions persisted, but it did not announce compulsory household restrictions. Brussels Environment also reported falling flows in non-navigable waterways, measures to conserve canal water and a very high wildfire risk in regional forests and green spaces.

The pressure comes from both supply and demand. Brussels Environment’s 2026 water assessment says daily deliveries are typically about 15% above average during periods of intense heat. Its June monitoring had rated the overall balance between production and consumption as good, while placing gravity-fed catchments under heightened vigilance because that indicator had crossed a critical threshold on 26 May.

Brussels is unusually dependent on water gathered outside the region. Planning documents published by Brussels Environment state that 97% of the capital’s supply comes from Wallonia, through groundwater sources and water from the Meuse. That network has protected Brussels during previous dry summers, but prolonged drought reduces aquifer recharge and constrains surface-water abstraction.

The immediate message is therefore conservation, not panic. The City of Brussels repeats the regional advice to defer avoidable water use, while the regional unit continues monitoring supply, groundwater and rainfall. The next significant development will be any formal change to the yellow alert or the introduction of binding restrictions; neither a timetable nor a higher alert level had been confirmed in the sources reviewed by 17 August.