The Environmental Protection Authority says a five year review of the way 1080 poison is being used in aerial drops for pest control shows the rules covering its use are working well.
It says fewer complaints and incidents are being reported, and as a result the authority doesn't see the need to reassess it again.
However, compliance manager Andrea Eng says the EPA will continue annual monitoring of 1080 aerial drops to kill possums and other pests such as rats, stoats and rabbits.
She says the former Environmental Risk Management Authority carried out a reassessment of 1080 in 2007 and one of the things it did was to tighten the controls on aerial use, which included the requirement to submit post-operational reports to the EPA every year.
Ms Eng says EPA has been monitoring those reports every year and thought it was timely to take a look back and see how that regime was working.
"What we found is it is being used responsibly and safely, so this is reflected in improved communication with fewer complaints, a drop in incidents and a general operator willingness to improve and learn."
Ms Eng says what's been concluded from that is that there is no need to carry out a further assessment.