"You know where everything is," Mr Ockenden said.
"You do everything from opening up in the morning to taking the rubbish away."
She had told a newspaper interviewer that she had never anticipated the pleasure she had gained from her involvement, and that she hoped she had made a difference.
"You certainly have," Mr Ockenden added.
Mayor John Carter also congratulated Mrs Cossey.
"There is no question that this country wouldn't survive without volunteers," he said. "People like you are the heartbeat of our community. We are a wonderful nation because of people like you. Thank you on behalf of Kaitaia, the Far North, Northland and New Zealand."
Mrs Cossey was quick to share the honour, however.
"It's really a group thing," she said.
"You cannot do these things on your own."
She had met some incredible people through RDA, and when Chris Timmins came on board the organisation really became a team.
"I was looking for a new direction in my life when I got involved, and I have benefited so much personally," she added.
"It has given me so many wonderful opportunities to meet people."
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The Tom Atchison Award commemorates the Hawke's Bay farmer and father of three horse-mad daughters who saw Riding for the Disabled in the UK, and spent the rest of his life establishing it in New Zealand.
The organisation now comprises 55 groups with 2000 volunteers and at last count 3281 riders.