"However, we did have a number of issues including some people not receiving messages until many hours later and some people not receiving them at all. There are a number of possible reasons for this and we are working closely with the system provider and other relevant groups to get to the root of the problem to resolve it. This is a priority for our group at the moment," Ms Reade said.
"This is why we test our systems to ensure that things run smoothly on the day".
Residents are encouraged to sign up to the service and to follow Civil Defence on Facebook and Twitter to keep up to date with the latest Civil Defence information.
"The system is robust and the nature of a test like the one on Sunday is to ensure that we can improve it constantly. So feedback is important - if you received the messages or if you didn't, we would like to hear from you on our website (www.bopcivildefence.govt.nz). Feedback will help us get a better handle on where and what time the issues were for some subscribers.
"A final thanks to all those who got involved with Get Ready week and took the opportunity to make sure their family and friends were prepared should a real disaster strike. We are all working towards a more resilient Bay of Plenty community," Ms Reade said.