It is understood the local 37-year-old was near the GlaxoSmithKline plant in Dungarvan when the fatal incident occurred.
It is believed contractors were cutting trees in the grounds of the pharmaceutical plant at the time.
The emergency services were called at about 3pm and quickly arrived on the scene.
Ambulance personnel attempted to resuscitate the man but he was pronounced dead on arrival at Waterford Regional Hospital.
The site is located in the Clogherane area outside the town of Dungarvan, close to the main Cork road.
About 700 people are currently employed at the company’s two manufacturing operations in Dungarvan, which opened in 1981 and 1987.
The facilities are used for the manufacturing of over-the-counter medications such as Panadol, and Solpadeine as well as dental fixatives and denture cleaning tablets.
The multinational pharmaceutical company also employs several hundred people in Cork.
Yesterday’s incident is being investigated by the company itself as well as gardaí, while the Health and Safety Authority were also notified by management.
In a statement, the company said it wanted to extend its sympathies to the man’s family.