Seems abit low for a Civil Engineer. However having said that, I suppose you are fresh out of university or just 1-2 years work experience? Then it's about there. A little more experience 3-5years will net you about 80-100K. And more if experience is greater than 5 years to about 120K.
Taranaki is a nice place though to live and work though. The lower pay could also be because it is out of the city area. If you try similar applications in Auckland, you might get higher pay. But you also have to contend with higher rentals and house prices.