I understand where you're going with that, but if I show you a picture of an apple do I need to state that it's an apple? Unless written otherwise, the landscape that is created in FO3 should explain itself and/or give you the tools to "figure it out". At the least, it gives you the ability to formulate your own account of what happened.
OT-I liked Zion and I can see all FO stories and environments working cohesively to paint a unique picture of FO America.
Just cause it has radioactive waste and barrels doesn't make DC into a dump like you stated.
And yeah, you might show me a picture of an apple, but who's to say that apple isn't poisoned`? Of that it only shows one side and it's actually split in half but positioned so you can see the cut side?
That's the problem.
We're shown an apple but given no additional information on it, we can agree that it is in fact an apple, but what else is there to this apple?
That is what we need information on, that is what information we're not given, and speculating doesn't lead us anywhere as speculation without any basis is not canon.
What if this apple is green and has a red spot on the other side?
Is there a hole in it from an insect?
We don't know.
So there are toxic dumps.
There are radioactive barrels around there.
But are they responsible for the rest of the radiation?
Who placed these barrels here? And for what reason?
And it's not up to us to fill out what Bethesda failed to explain to us.
Other Fallout games did just fine explaining things to us, why should we not demand for clear cut facts from Bethesda?
[edit]
Styles, well the water radiation is explained at least, somewhat.
The Pitt has three radioactive rivers that connect into one, creating a hyper radioactive river that eventually reaches the CW, at which point the radiation is dropped to lower levels.