An injunction is a court order prohibiting a party from a specific course of action. Perpetual injunction is one that is granted by the judgment that ultimately disposes of the injunction suit. It is ordered at the time of final judgment. This type of injunction must always be a final relief. Permanent injunctions are regarded as perpetual conditions that produced them remain permanent. They can be granted to prevent blasting upon neighboring premises, to enjoin the dumping of earth or other material upon land, and to prevent pollution of a water supply. An individual who violates an injunction may be punished for contempt of court. A person is not guilty of contempt, however, unless he or she can be charged with knowledge of the injunction.