Cannabis, MDMA and utensils have been seized at Rhythm and Vines.
Police say crowds at the popular Gisborne festival were "generally well-behaved", although several people were arrested.
"An amount of drugs including cannabis, MDMA and utensils were seized by staff over the duration of the festival," a police spokesperson says.
"Over the duration of the festival, five people were arrested for assault or drug-related incidents."
Police say no significant issues or incidents were reported at Rhythm and Vines, or any other of the main New Year's Eve celebrations.
"This year, we saw some 15,000 people camp on the Rhythm and Vines grounds site and at the peak of the event on New Year's Eve we had up to 23,000 attendees," a spokesperson says.
"Overall we are really pleased with the crowd behaviour and the behaviour of those surrounding the event.
"We had staff monitoring road user behaviour on the roads surrounding the event and we had minimal excess breath alcohol incidents and crashes."
St John says it had around 1100 calls between 6pm and 6am, the busiest night of the year.
The number one reason for a callout was people collapsing from alcohol and drug use, accounting for 13 percent of callouts, followed by falls and breathing problems.
Most callouts happened in Auckland, followed by Whangamata, Gisborne, Napier, Queenstown, Wanaka, Tauranga.
"A lot of those areas are the coastal party areas," Devanney said, which take ambulances longer to get to.