Mayor Bill de Blasio tried to explain away NYCHA’s lead paint scandal by saying that the poisoning might not even come from lead paint.

“This is scientific fact . . . lead poisoning comes from numerous sources,” de Blasio told NY1 Monday. “It can be something in the home, it can be something out of the home, it can be paint, it can be something else.”

As many as 820 kids in ­NYCHA buildings have tested positive for unsafe levels of lead.