Belgian relief is expected to find other victims as water began to recede from the disaster areas on Friday.
The province of Liège in eastern Belgium is the most affected by these floods, which also hit Germany, Luxembourg and the Netherlands.
The floods which have devastated much of Belgium since Wednesday have left at least 18 dead, while 19 people were missing, according to an official report from the national crisis center, Friday at midday.
This is the latest report communicated by the Minister of the Interior Annelies Verlinden, said Antoine Iseux, spokesperson for the crisis center.
Water was gradually withdrawing from the flooded areas on Friday and relief workers expected to find more victims.
"We can expect unpleasant surprises," said Antoine Iseux.
Belgian media reported at least 23 deaths recorded in the morning.
About twenty collapsed houses
The province of Liège in the east of the country is the most affected by the floods and concentrates most of the relief operations. The municipalities of Verviers and Pepinster alone have recorded at least ten deaths. In Pepinster, on the banks of the Vesdre, around twenty houses have collapsed, according to mayor Philippe Godin. "We have ten people deceased and nearly ten people we have not heard from," said the elected official.