A worker must demonstrate that their "noisy employment" was the cause of their hearing loss in order to file a claim. In other words, hearing loss alone does not establish a claim. To ascertain whether the hearing loss is indeed connected to the job and how much is lost, a medical evaluation is conducted. Establishing the "date of injury" is crucial when filing a claim for hearing impairment.
In general, the date of the injury is considered to be the day that notice of the injury is given. The worker's last day of employment in a noisy workplace is considered to have been the date of injury if, at the time of giving notice, the worker is not employed at all or in a noisy workplace. Any prior noisy employers within the five years prior to the claim may be requested to contribute by a workers' compensation insurer.