Council finance general manager Mike Fermor said council needed to balance keeping rates down with paying off debt in key areas like stormwater and roading.
"Which I think makes it sustainable, which is great," he said.
"These rates ensure that we have adequate loan repayments with those areas."
Whanganui mayor Hamish McDouall said it was timely there was a Government-led "in-depth study on the way local government is funded".
"We've got people who know what they're doing, I hope, and I've committed to pursuing ways other than rates to fund local government - that's not excluding rates - but other ways," he said.
"Having just attended the local government conference and hearing some fairly eye-watering figures coming from other districts, I think we're doing quite well."
Deputy mayor Jenny Duncan reminded residents there was a rates rebate available for low income people.
"So [there is] a strong encouragement for our ratepayer base to do that," she said.