Is worry justified or not?

Maybe I didn't get that across properly. I'm just worried that over months things will accumulate there that will then become costly for us to haul away, because maybe no one will want to take responsibility. And then there was the issue with the "nail boards." The property is in the field and is not yet recognizable as a construction site. Right next to it is a path used by many walkers. That makes me a bit nervous. Of course, they don’t walk around there with safety shoes.

As long as the property doesn't belong to you, you have zero rights to hold anyone liable. You can only tell the seller (municipality) that you would like the property cleared upon takeover and that you currently suspect a potential hazard on the site.

I see it differently. Especially BEFORE buying. I would simply include the clause in the purchase contract that the property is handed over cleared. Then it is the municipality's responsibility.

If you have the time and desire for weeks of bureaucracy, then that is a great idea.

The purchase contract is provided in advance. A short email to the [Gemeinde] and [Notar]. Additionally, call them. Obviously, the [Gemeinde] seems to act quickly anyway.

In any case, I would not take on any external obligations. Possibly dispose of contaminated soil and debris. The seller should take care of it. And will do so. Since [Gemeinde]

In any case, I would not buy any third-party obligations. Possibly dispose of contaminated soil and rubble. The seller should take care of it. And he will. Since it's the municipality

Why should she (the municipality) put herself through the stress when there are 5 more interested parties lined up? The market is so tight that you'll have the next buyer as early as tomorrow.
Anyone currently looking for land is not in a position to demand anything in negotiations.

Relax, everyone, if a construction worker reads this, he'll laugh his head off. If the stuff is still there by the start of construction despite previous requests to the neighbor, it will simply be pushed over with their own excavator within 10 minutes. It might even cost a whole crate of beer for the guys.

Sometimes you really make a fuss *shakes head*

Relax everyone, if a construction worker reads this, they'll be rolling on the floor laughing. As long as the stuff is still there by the start of the construction despite asking the neighbor beforehand, it will simply be pushed over with one's own excavator within 10 minutes. Might even cost a whole case of beer for the guys.

I see it the same way. Anyone worrying here can't tell an elephant from an ant.

Our new development area includes 8 plots. All the plots have been sold and all but one are built on. We bought our plot 5 years ago and only started building in 2018. The one undeveloped plot (sold) is completely overgrown; old branches, stones, and compost from the immediate neighborhood are dumped there. Recently, I carelessly threw a cigarette butt onto this plot. But the neighbor immediately came out and warned me to pick it up again because his children play there.