A WorkSafe statement said charges had been laid "against one party in relation to the incident", but did not name the party.
The first court appearance would be on November 1, the statement said.
Details of the incident were included in a report discussed at a Central Otago District Council meeting last week.
The health and safety report classified the incident with council contractor All Waste as a "notifiable incident".
It involved an employee sustaining "a significant injury" from a fall into the hopper at the Cromwell Transfer Station on June 26, 2017.A preliminary report had been received from All Waste’s parent company, Trojan Holdings, the council report said.
When contacted by the Otago Daily Times, council executive manager infrastructure services Julie Muir said All Waste had made some operational changes "to improve safety" following the incident.
"This has included a barrier across the front of the hopper, as well as redirecting skips to another site."
Ms Muir would not comment on which party had been prosecuted regarding the incident.
A Trojan Holdings spokesman said the WorkSafe investigation was "ongoing" and Trojan Holdings was "being fully co-operative". Investigations were continuing into a second "notifiable" incident in the council health and safety report, when a non-council contractor installing ultrafast broadband received an electric shock from a streetlight column in Wishart Cres, Cromwell, on March 22. No injury resulted but Delta Utility Services was contacted immediately and "made safe" the situation and tested all recently upgraded streetlights, the council report said.
It was believed the incident was related to a change in electrical wiring practice from the streetlight’s original installation in the 1980s to the current upgrade, the council report said.
A spokesman for Delta and Aurora Energy said the streetlights were owned by the Central Otago District Council and were not Aurora Energy assets.
A WorkSafe spokesman said they could not find any record of the incident and "it would not necessarily meet the threshold to be a notifiable incident".
A report on another incident, understood to involve a person receiving an electric shock in Roxburgh during the clean-up following the floods there last year, has been completed by Aurora and given to the CODC.
Ms Muir said the report would "likely be" presented to the council’s audit and risk committee in October.
