These repellants come in liquid or granule form, and they usually contain a concentrated form of predator urine. Such predators include fox or coyote urine. These predators are natural enemies of woodchucks, and so woodchucks know to stay away from these scents if they are to stand a chance at living. 

It would be best if you sprayed the liquid repellents on surfaces like plants, wood, and grass to discourage eating, digging, and gnawing. That would make them seek shelter away from your property. It’s an excellent method to use if you have pets and kids around or if you prefer to use non-toxic substances. You should, however, know that repellants wear away quickly, and you should combine this method with other methods for effectiveness.

You can also use dog or cat urine as an alternative to the urine granules of the predators and make sure that you place some of their fur around the burrow entrance of the woodchucks; you will keep them away by doing this.