I don't remember the numbers- but one of our wells is fairly high in arsenic too...We use reverse osmosis to remove it for drinking- but do water cows out of it 5-6 months a year....The "experts" told us that with only that amount of time usage it would have no effect on the cows...
The old timers that had that place before us drank it year around and lived well into their 80's...Only problem I had drinking it was all the salts in it acted just like prune juice til you got used to it... :shock: