You have a full heated basement, you should be just fine. If you were in a trailer or on a slab you could have more to worry about. It hasn't been cold enough to freeze deeply and this weekend isn't going to flash freeze the ground that much. In the 30 yrs I've owned houses in my mid coast town, the only one to ever freeze up was on a slab and the water in pipe came to the slab and was just barely under the ground where it met the house and froze ONCE in the 10 years I had it. Now I have a full heated basement plus a woodstove down there, so I'm not phased by the cold now. I just hate when the power is out and we all have to sleep in the living room lol. Gotta get my house plug hooked up for my generator.