Whoo, so many replies! I keep screwing up quotes, so I won’t even try. To answer some points:
I should have made it clearer: the house was abandoned by Woman #1 in the 1970s (estimate, based on one date mentioned plus how long some other things that happened – like children getting older – had to have taken. She bought the house in the 60s, and at that point it was empty and for sale, so who knows how much earlier it was actually built? (You English with your 400 year old building littering the place.) But it did have an indoor bathroom with piped water, so probably not hundreds of years old. That was why I threw in the stuff about it being a ‘flint house’, figuring that might be a clue as to its age. As I said, it really didn’t convey anything to me, I’m not aware of flint as being a building/veneering material in America.
That was also why I added things about ‘the plow’ and whatever. They seemed like they were put in because they would convey information to British readers, although nothing to this Yank. Sorry if they end up spoiling anyone’s pleasure later on.
The author is (was?) definitely English. I’ve seen a brief bio sketch.
I’m sure nothing was ever said about the metallic composition of pipes or taps. I don’t remember anything said about the roof, wait, at one point she definitely said it wasn’t thatched.
At one point the current lead character was walking around the house area, just for exercise/viewing nature, and she talked of walking through some areas with trees and others that weren’t, plus some marshy areas with some open water – though it didn’t sound like it rose to the size of even ponds, maybe seasonal puddles? So the people saying the area is too flat for gravity fed water from hills might fit that, but if the water table is that close to the surface and, uh, ‘free’ to flow out, would that rule out artesian wells, too?
Anyway, I’ve decided that I must simply accept that the author wanted things the way she did to accommodate her plot. The house was in ‘suitable’ condition for the second affair to happen there, and that was that. She was, after all, interested in the emotional aspects of the affairs and how it affected the lives of the people involved directly or collaterally, not writing a treatise on proper plumbing maintenance.