Look for the seal to make sure it's certified local. Up to 20% of the milk in California grocery stores is actually trucked in from out-of-state. So to know that the milk you're bringing home to your family is certified local, the best thing you can do is look for the Real California Milk seal. The seal certifies that the milk you're purchasing is 100% Grade A milk, sourced exclusively from local dairies here in the Golden State. It also assures you that you're supporting local dairy families and providing top quality milk for your family.