Remoteness isn't really a factor in how difficult it is to provide water & sanitation services, as long as it's not a fly-in only area. Unless you find yourself in a desert (or tundra), pretty well everywhere has usable groundwater, and as long as there is access by road or water to get building materials on site it shouldn't be prohibitively expensive to transport materials.

I've been to a lot of hole-in-the-wall towns with populations of less than 1,000 in rural California, Ontario and B.C. and I've never once seen a latrine.

Now fly-in Native reserves in northern Canada - that's another story.