Brussels extended its code yellow drought alert on 5 August, with no end date attached. The extension came from the same coordination that issued the original warning in late July, Brussels Environment working with Vivaqua, the Port of Brussels and Safe.brussels, and the advice to residents is the same as it was three weeks ago: avoid washing cars, filling pools, cleaning pavements and terraces, and watering lawns and ornamental plants.
What justifies calling it an extension rather than a repeat is a second dataset that has nothing to do with rainfall in Brussels itself. A Flemish groundwater survey taken on 2 August found 81 percent of monitored sites at low or very low levels, with 56 percent very low and a further 25 percent low. Groundwater is a lagging indicator by nature. It falls only after weeks of a rainfall deficit have already worked their way down through the soil, which is why a figure like this arrives after the surface symptoms rather than alongside them, and why it is harder to reverse quickly once it turns.
Flanders has been under its own code orange alert, one level above Brussels' code yellow, since the middle of July. The Royal Meteorological Institute's drought index has Brussels moving in the same direction. Forest fire risk in the region is rated code orange, the second highest level. None of these are new instruments. What is notable is that they are all now pointing the same way at once, which is a different situation from any single indicator moving on its own.
The one reassurance in the update is deliberate and worth taking at face value: drinking water supplies are described as stable despite the pressure. Belgian water utilities draw on a mix of surface reservoirs, treated river water and groundwater, and a stressed groundwater table does not automatically mean a stressed tap, provided the utility has the blend to compensate. That is a statement about supply engineering, not about the underlying water balance, and the two should not be read as the same claim.
The practical difference for a Brussels resident is small: the same requests apply for a while longer. The practical difference for anyone reading the indicators is that a groundwater table this low does not recover in the following week regardless of what the sky does, because it is measuring a deficit that took a season to accumulate. An alert extended on this kind of evidence is not really a forecast. It is a statement that the recovery, when it comes, will take longer than the dry spell that caused it.