WorkSafe took enforcement action against four managed isolation facilities last year after reviewing their health and safety measures.
The agency says the assessments focused on the effectiveness of risk management and controls, the use of protective equipment, worker engagement, participation and representation.
Letters were issued to the four hotels in relation to the breaches.
WorkSafe says it is satisfied the matters were attended to promptly and remedied by the hotel management.
In last year's nationwide lockdown, WorkSafe said its staff carried out close to 2500 on site assessments related to Covid-19.
Minister for Covid-19 Response Chris Hipkins last week denied standards were slipping at the facilities after a managed isolation staffer lost their job due to an illicit rendezvous.
Hipkins described the incident at the Grand Millennium in central Auckland as a "one-off" and said the staffer had been sanctioned.
However at the same briefing Hipkins admitted that there was "something going on at the Pullman".
There have been three Covid-19 cases where guests caught the virus while staying at the Pullman Hotel in Auckland.