Our Farmers Pledge: Not to use 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). Since 1945. Farmer owned. Community loved. Real California milk. Homogenized. Alta Dena Dairy has been providing families with delicious, fresh dairy since 1945. Today Alta Dena is 100% owned by a dairy farm cooperative that includes family farms right in your community. Bringing fresh, high quality dairy to families like yours is our farmers' purpose and passion.