You would need to contact your local tax assessor's office and file an appeal. Numerous residential homes throughout the country may be overly assessed in value depending upon when their re-evaluation was performed. This is the main criteria for reducing a property's taxes but each municipality operates differently so you need to speak with your local tax assessor's department to determine if you can reduce your property's taxes and what the process is.
Good luck to you!
Prudential Connecticut Realty