UPDATED 11.32am Some dissent among Goose Bay residents evacuated from their homes near Kaikoura.
LISTEN ABOVE: Civil Defence controller Murray Sinclair spoke to Rachel Smalley with the latest on the dam situation
They're clashing with Civil Defence officials who moved 17 of them out yesterday after being told a dam is on the brink of giving way.
It could be up to 10 days until they can return.
Paul Keung runs Goose Bay's Moana Farm and doubts the seriousness of the situation after walking around the dam and flying over twice in his helicopter.
"I ended up seeing two or three helicopters heading back up there within a couple of hours. I'm sure they'll be sorely embarrassed. Last night they should have made a call that they've made a mistake. You need to actually get some people with local knowledge and work together."
He said the rest of the village doesn't believe it either, and are furious.
"Some of them arrived back from overseas, got home to clean up all of their mess... literally walked in their door and Civil Defence said, 'you're out.'"
Civil Defence said if the five-metre dam caused by a landslip just south of Kaikoura bursts, 35 houses and baches will be washed away.
Mr Keung said he's told the Civil Defence controller he's made a massive mistake, but local knowledge is being dismissed.
"He's assumed this big slip has gone in the creek, which it hasn't. Who knows what's going to happen but it doesn't back up all the way like he thinks it does. It's a small slip."
MORE: Urgent evacuation south of Kaikoura after earthquake
The area's Civil Defence controller Murray Sinclair told Rachel Smalley scientists are monitoring the naturally-created dam.
He said they're hoping the water gradually builds up, goes over the top and then slowly cuts its way through - but they can't be certain it won't burst so public safety is paramount.
Civil Defence's Charlotte O'Sullivan said evacuees will stay with friends and family, or will be given accommodation.
"We have heard that everyone was understanding of it. Bad weather is coming and it could breach so and it's in their best interests to evacuate. They all understood it. They've been really receptive of the news.
"The geotechnical engineers will keeping an eye on the size of the dam and the forecast, and then just basing it on the risk factor."
Ms O'Sullivan said Civil Defence welfare teams will be staying in touch with evacuees, as more information comes to light.