Known child abuse and neglect has more than doubled in Whangarei in the past two years it has been revealed, as the Government announces sweeping legislative changes in an attempt to stem "horrific" rates of family violence.

Child, Youth and Family figures showed 941 confirmed cases of child abuse and neglect in Whangarei in the year to June.

This rose from 518 a year earlier, and 463 in the June 2014 year, after it fell from 850 the year before.

These were instances CYF established as emotional, physical or sexual abuse, as well as cases of neglect.

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This was in contrast to the rest of Te Tai Tokerau, in which confirmed cases of child abuse and neglect fell more than 35 per cent since 2013.

The executive director of violence-free whanau organisation Mana Ririki, Tu Williams, said because cases of child abuse were so significantly under-reported, many more children would have been victims of harm.

"What would concern me is the number of unreported cases. You can only make assumptions about what the level of child abuse and family violence cases would be," Mr Williams said.

"Even if there is a decline - and it's great if there is - the point is that the statistics are still far too high."

CYF recorded 1393 confirmed cases of child abuse in Northland in the 2016 year to June - an average of almost four per day.

The Government said family violence figures were probably five times higher than reported. Justice Minister Amy Adams and Social Development Minister Anne Tolley recently announced "sweeping reforms" to combat the "horrific" rates of family violence and abuse in New Zealand.

"Young people exposed to family violence ... are four times more likely to commit sexual violence against a partner ... three times more likely to attempt suicide, and 57 per cent [more likely to] leave school without a qualification," Minister Adams said.

Nationally, CYF found 16,394 cases of substantiated child abuse or neglect in the June 2016 year - 45 each day. Around 8500 cases were emotional abuse, 3600 cases of neglect, 3100 cases of physical abuse and 1200 cases of sexual abuse.

The total figure dropped from 22,984 in 2013.

Child, Youth and Family chief social worker Paul Nixon said it was difficult to definitively say abuse had fallen.

"Child, Youth and Family's focus is not on whether particular numbers go up or down; it is on whether we are making the right decisions when we get notifications."

Mr Nixon said the 17,000 fewer cases requiring CYF action over the past four years - a 28 per cent decrease - were picked up by other agencies.

"That's exactly what's happening, and that was the strategy, to get more [external] agencies involved earlier in the lives of these children."

Amanda Meynell, national manager of a child abuse prevention charity Child Matters, said it was difficult to draw any conclusions from the statistics due to the unknown extent of unreported cases.