“Cows need to consume between 30 and 50 gallons of water per day,” said Donna Amaral-Phillips, extension dairy specialist for the University of Kentucky College of Agriculture, Food and Environment. “That’s more than 415 pounds of water every day.”

That number may sound extremely high until the consumer realizes it takes up to 4.5 pounds of water to make just 1 pound of milk, and cows produce, on average, 70 pounds, or 8 gallons of milk each day, which is equal to about 128 glasses.

A Whole Lot of Water Goes Into That Milk | Dairy Herd Management

hmmm