Tou had to go through permafrost??? Where are you guys, how far north?
400 feet was an estimate due to our neighbors wells being 300 feet deep.... and we are up on the hill. I think I should find a Dowser to help with finding a source so we don't have to drill so deep!
We live by the Prince Albert National Park in Saskatchewan Canada. Where we dug the well was like a peat bog which acts like an insulator holding the cold in the ground. It surprised us too when we saw the ice crystals in the ground in the middle of summer!