Why is all the milk in grocery stores “Grade A”? What is a lower grade and where is it?

Question

Why is all the milk in grocery stores “Grade A”? What is a lower grade and where is it?

In: Biology

Answer 1

Everyone is talking about Grade A drinking milk and Grade B industrial milk and not actually defining the differences.

[This water disenfection company](https://www.go2intl.com/blog/how-does-grade-a-milk-differ-from-grade-b-milk/) (?) has a comparison table, and the main difference seems to be bacterial load. Grade A allows no more than 100,000/ml, while Grade B goes up to 1 million/ml. Additionally, farmers making Grade A milk have to follow “water body authority standards.” So there is some kind of oversight that is not present for Grade B.