Ohinemutu is always blanketed in steam, but a fresh eruption in the lake this weekend has frightened a few residents.
Saturday afternoon, about 4pm, Maaka Maxwell, 10, and his brother Ari, 11, came running into the house yelling that the lake had erupted.
"There was like a geyser in the lake," Ari said.
"Smoke was coming out of it but it wasn't really scary."
The boys had just gone outside with their cousins when they saw it.