The power line is only specified at the power frequency, which is usually 50 or 60 Hz. At such low frequencies, the inductance and capacitance of wiring in your house is irrelevant. The series resistance can matter, and is something you can just look up for whatever cable you are using. For the sizes of cable used in a house, skin effect is not a issue, so the DC resistance is close enough to the actual resistance at the power frequency.
Anything much above the power frequency is unspecified. There is little guarantee what the transformer making the low voltage from the local feeder looks like at high frequencies. Some will pass RF, others will block RF, for example.
The only way to know the impedance at high frequencies is to measure it where you care. You can feed a high frequency signal onto the power line thru a capacitor and see how much it gets attenuated. You measure the result thru another capacitor. These caps need to be able to withstand the full power voltage, and you have to filter off that voltage to see the small signal that would otherwise be tiny in relation.
I actually did this at 1 MHz many years ago in a dorm at college. I don't remember the exact answer, but it was in the 10s of Ohms range. However, that measurement is only valid for that place with the transformers they used, with whatever appliances others had plugged in, etc. You really have to measure your own case to know what you have.