In the Lakes District Health Board area, 17 people committed suicide in the past year, a rate of 16.6 per 100,000 - a higher rate than the national average of 12.64.
Since 2007/8, 172 people in the Lakes area have died by suicide.
Men, Maori and those aged 18-24 have the highest suicide rates throughout the country.
A recent event on the Rotorua lakefront using pairs of shoes to represent the number of people lost to suicide was a major success, Mr Oosterman said.
"We need to ensure we empower bereaved families to be at the forefront of change. The Rotorua event was a really good example of that."
There has been a 60 per cent increase in demand on services nationally - an extra 96,000 people accessing secondary mental health services in the past 10 years.
Funding has increased by less than 30 per cent over the same period - from $1.1 billion in 2008/9 to $1.4b for 2015/6.
Just 60 per cent of people under 19 referred to mental health services - and classified as non-urgent - were seen within three weeks at Lakes DHB in 2015/16.
Rotokawa School principal and Rotorua Principals' Association president Briar Stewart said more help was needed in schools.
"Probably 20 per cent of your roll would be children who need some kind of support. It is enough to put pressure on teachers.
"The number of students coming through with a wide variety of needs has definitely increased."
Counsellors and social workers in schools were required, she said, to take that pressure off teachers.
"We already do cover a lot of social work-type things."
The Government has launched a number of new initiatives and announced $224 million more in funding in the run-up to the election, but this would be distributed over four years.
The Mental Health Foundation and Yeswecare.nz have called for a suicide reduction target.
"The Government needs to work much harder to develop a plan for significant change that the community is inspired by and supports," Mental Health Foundation chief executive Shaun Robinson said.
"A target for reducing deaths would be a good step in the right direction."
Health Minister Jonathan Coleman had refused to set a target for a reduced suicide rate, despite the mental health commissioner's recommendation to do so.
However, he said earlier this week there could be benefits in setting a target and would not rule it out.
"I've met some people who have worked in this area, specifically some people from the Zero Suicide group, and the point they made is actually setting targets changes the culture within the mental health workforce.
"It does seem that setting a goal, and it may be aspirational but that doesn't matter, it actually just focuses efforts."
Yeswecare.nz also supported a target for suicide reduction, along with five other measures to improve mental health care and reduce suicides.
A mental health inquiry, an additional $2.3b in funding, an increase in primary health funding, safe staffing levels and healthy homes are the group's other pledges.
The group has sent letters to all political parties in the lead-up to the election and their co-ordinator said all but two parties - Act and National - agreed to implement all six measures.
There should be a cross-party consensus on mental health, Mr Oosterman said.
Other advocates, including Mr King, have also called for an inquiry into mental health services.
Dr Coleman has said reducing the youth suicide rate was his "top priority".
No one from Lakes District Health Board was available to comment before the deadline for this article.
WHERE TO GET HELP: If you are worried about your or someone else's mental health, the best place to get help is your GP or local mental health provider. However, if you or someone else is in danger or endangering others, call 111.
If you need to talk to someone, the following free helplines operate 24/7: DEPRESSION HELPLINE: 0800 111 757 LIFELINE: 0800 543 354 NEED TO TALK? Call or text 1737 SAMARITANS: 0800 726 666 YOUTHLINE: 0800 376 633 or text 234