What effect does NIHL have on a business?

Occupational hearing loss costs an estimated $242.4 million per year in disability alone.

Answer Extra: 

This amount is based on the Washington state 1991 workers' compensation hearing-related disability settlements, extended across the national workforce. It doesn’t include other costs that can include roughly $1500 for a hearing aid and approximately $300/year for batteries. It should be noted that, due to under-reporting, workers' compensation data is generally believed to reflect an incomplete picture.

source: NIOSH Pub. No. 2001-103