Ground Squirrels are often thought of as a pest like a mouse or rat. Each state has different regulations regarding ground squirrel control. If you are treating your own property, most do not require a license. Before you start, check with your local Agricultural Commissioner or County Offices to see if you need a pest control license in your state.
The California Fish and Game Commission classifies Tree Squirrels as a game animal and Ground Squirrels as a nongame animal. A property owner or tenant can control in any legal manner, nongame animals that are damaging property or injuring growing crops. Game animals, like the tree squirrel have a hunting season and a license may be required.
California Fish and Game Commission - Hunting Tree Squirrels and Trapping Ground Squirrels
California Department of Pest Regulation - If you are providing ground squirrel control service for hire or profit, in California, you need a qualified applicators license (QAL). Ground Squirrels Pest Control
Before using any method of ground squirrel control, check with your local State Department of Agriculture or County Agriculture Advisor to learn about your local protected animals, how to identify them and their habitat, and how to protect them when you are treating for ground squirrels.
If you have any questions, feel free to contact me.