Fellow Otuihau vollie Diana Mehaffy said the programme had increased the number of visitors to the Falls.
"People can't believe how much safer it is," she said.
"I walk a dog down here every morning. You'll see a car come in and start moseying around, so I'll just start picking up a bit of rubbish and looking like I belong to the place and it goes."
The programme has been named as a finalist in the 2016 Local Government New Zealand (LGNZ) Excellence Awards and the scheme was believed to be the only one of its type in the country.
Ambassadors patrol between December and Easter and last season contributed almost 1500 hours of volunteer time.
WDC community services manager Owen Thomas said the programme operated around values of manaakitanga - respect, generosity and care for others.
"The work these people are doing is not only reducing crime but also increasing the number of visitors and the people who want to live here."
He said they were "always" seeking new volunteers and anyone interested could contact the community safety officer on 430 4200. Award winners will be announced at a gala dinner during the LGNZ Conference, July 24 to 26.