"These options include high quality household septic tank systems under the regional council's on-site effluent treatment rules," Mr McLean said.
Rotorua mayor Steve Chadwick said the partnership formed with stakeholders for the project was an example of "the way of the future".
"Collaboration and genuine community engagement are absolutely critical elements if we're to identify a sustainable solution to the sewerage needs of these communities."
Mr McLean said public meetings would be held to discuss a shortlist of options with residents and other interested parties.
Details on the meetings would be publicised soon and mailed to residents.
"In due course, and after public consultation, our steering committee will be putting a recommendation to Rotorua District Council on our preferred option."
Subsidies for a new sewerage scheme are available from the Ministry of Health for Lake Rotoma and from the Ministry for the Environment for Lake Rotoiti.
A preferred option has to be selected by September 30 to qualify for the Ministry of Health subsidy. Other smaller subsidies are potentially available from the Bay of Plenty Regional Council and from Rotorua District Council general rates.