Most people have no way of answering this question. Here is what my power looks like in a scope:
https://photos.app.goo.gl/kxPz87c8iEVoRxTd7
4.2% THD. I live in a suburb of San Diego. Near a substation, mix of residential and industrial users.
Liviing in AK and HI might get you less load but no guarantee the small diesel generator supplying the grid makes good quality power.
Those who think they are running off batteries are not really. They are running of the relatively cheap inverter that came with their battery and if they put a scope on it they might be shocked at the ugly sine wave.
The only way to get a clean sine wave is to get a good regenerator. Here is the sine wave out of mine. 0.1% thd.
https://photos.app.goo.gl/ftBgf4cPveGunn679
Jerry