Alta Dena Dairy: Your Trusted Source Since 1945. We're proudly farmer-owned, with deep roots in the community. Our cooperative of local family farms is dedicated to delivering fresh, high-quality dairy to families like yours. As part of Dairy Farmers of America, we stand by our pledge against artificial growth hormones (no significant difference has been shown in milk from cows treated with the artificial growth hormone rbST and non-rbST treated cows). Alta Dena, Farmer Owned. Community Loved®. Real California Milk®.