Many places in Alaska and would image other remote areas of other northern states as well.
Unfortunately remote is no guarantee of clean and in some cases might even mean the opposite because being out of the public eye allows companies to ignore externalities that they would otherwise have to take responsibility for.
[1] https://news.nationalgeographic.com/2018/02/most-toxic-town-...
[2] https://www.npca.org/articles/1721-offshore-leasing-plan-thr...