"Everything is flooded, the water reaches halfway up the house, everything is destroyed. We have to start from the beginning now," Robert Lasota, a resident, said.
Floodwaters also submerged areas in the southwestern city of Wroclaw on Saturday after dikes failed.
Poland was hit by flooding last weekend after heavy rains.
Southern parts of the country were hit the worst, but northern areas are also being inundated as swollen waters in rivers move north towards the Baltic Sea.
The flood damage is estimated to have already cost more than 2.4bn euros.