TAG Oil says it was fully compliant during all construction and drilling activities according to a compliance-monitoring report from Horizons Regional Council.
Eleven site visits by council officers were made to the Ngapaeruru-1 well site east of Dannevirke and 11 phases of ground water and surface water analysed.
TAG Oil chief operating officer Drew Cadenhead said no complaints had been registered regarding environmental effects from drilling activities.
"We have started how we mean to go on - safely and with the community and environment in mind. We set very high standards for our staff and contractors and we demand they are adhered to.
"This will be the same for all operations carried out on the East Coast, or anywhere else," he said.
"We continue to analyse the data we acquired while drilling Ngapaeruru-1 and we expect to make a decision on any future activities in the coming months based on that data.
"The data we have reviewed to date is encouraging and we have planned for all eventualities on what the next steps may be, but until we have a clear understanding of the results of Ngapaeruru-1, we have made no final decisions yet," Mr Cadenhead said.
TAG holds another well permit for a site nearby.
Gisborne District Council has decided TAG's proposed Punawai-1 well did not need to be a notified consent because of the minimal effect of the well on the environment.