Yes, Helen, both now't and ow't are in use round here - pronounced as they are spelt here.
It isn't quite so common among the youngsters - but even they do use it a bit. The older folk use the expression exclusively, especially in the villages.

Incidentally, I knew that I was accepted in my village, even though I'm an off-comer, when one or two of the locals, perhaps some ten years younger than I, called me, "fayther!" - an ironic, but affectionate term.