We live ~20 miles from a dairy (actually, 3 dairies). The one that we primarily buy from is all Jersey cows. The cows hang out in a field eating grass. The use of chemicals is minimal. We buy the milk at the dairy. It's $8/gal, and it's not homogenized or pasteurized. It tastes better than anything you can get in a grocery store, and it lasts longer than anything you get from a grocery store.
WHat we have noticed is that when you buy organic milk, it's almost always "ultra pasteurized" or "UHT" which I think stands for ultra high temp. "“Ultra-pasteurized” means that the milk is heated to a minimum of 280°F for a minimum of 2 seconds. This temperature and time combination is much more lethal to bacteria, killing virtually all of concern."
UHT pasteurized milk tastes different from regular pasteurized milk. I've got to assume that heating it to 280º cooks the milk a bit and changes the flavor.
Before we moved to where we are near the dairy, we were buying "Mill King" milk.
https://mill-king.com/
"Our milk is low temperature pasteurized or batch pasteurized at 145 degrees for 30 minutes in order to preserve as many of the natural enzymes and nutrients as possible.
Our milk is also NOT homogenized, so the cream rises to the top.
We never add preservatives or additives to our milk, cream or cheese. It's all natural, the way it's meant to be.
Our cows are never given artificial hormones to increase production. They are grass-fed and spend the majority of their day in the grazing fields."
It's got a lot better flavor than the UHT stuff.