Public hazard and biosecurity issues were responsible for one-quarter of the top 20 PR challenges for 2017.
"Issues relating to people's health or safety are a regular feature of this list, but there are more than usual this year. We think this is due to stronger awareness and interest in health and biosecurity, rather than an actual increase in such risks," Blackham said.
"The heightened alarm has many contributors, from more monitoring and research, and media and public interest in risk, and an institutional bias toward publicising – particularly ahead of any need or benefit from doing so.
"The irony is that more publicity about risks only seems to increase interest and worry about risks, rather than reassuring people. Publicity also tends to generate unreasonable expectations about what can be done to diminish the chances of things going wrong."
Waikato DHB: 2017's annus horribilis
The assessment team gave special mention to Waikato DHB for its "annus horribilis".
"Waikato DHB stood out this year for what we call a 'black hole' issue, where a small PR issue grows and threatens to suck in a whole organisation.
"What started as a story about incompetence and financial mismanagement has morphed into scrutiny about the DHB's abilities to perform core functions such as accrediting drinking water."
The rankings
1. Green Party - Metiria Turei 'confession'
2. Government - 1st 100 days
3. Refining New Zealand - Wiri pipeline breakage
4. Hasting District Council - Water contamination inquiry
5. Winston Peters - Coalition announcement
6. Ministry of Transport - Joanne Harrison fraud
7. Ministry of Primary Industries - Kauri dieback
8. Ministry of Education - Changes/removal of National Standards
9. New Zealand Transport Agency - Reopening of SH1 (Kaikoura)
10. Regional Councils - Commercial water bottling
11. Labour Party - Jacinda Ardern secures party leadership
12. Fuel companies - Fuel price inquiry
13. Waikato DHB - Financial impropriety and incompetence
14. Auckland Council, Team NZ, Government - America's Cup hosting decisions
15. Government - Pay equity for caregivers
16. Fonterra - CEO salary and bonus
17. Ministry for Primary Industries - Mycoplasma bovis
18. Ministry for Primary Industries - Myrtle rust
19. Bay of Plenty Regional Council - Edgecumbe flooding and inquiry
20. Ministry for Primary Industries - Bonamia in oysters