CRANBERRY TWP — The township on Wednesday will have an open house to provide residents with information about the proposed Brush Creek sewage treatment plant expansion.

Township manager Jerry Andree said officials have been working on the project for more than a year and a half.

They’ve compiled seven options for the facility’s renovation, options that range from $54 million to $68 million.

Residents on Wednesday can see in detail each option and question officials about them.

The open house will be from 1 to 8 p.m. in the council chambers at the municipal center on Rochester Road.

Andree said the need for renovations at the facility is twofold.

First, new regulations from the state Department of Environmental Protection require Cranberry to upgrade its facilities.

“Every five years we need to get a new operating permit from the state, and we know what they’re telling us in terms of what we need to change to meet those requirements,” Andree said. “Those new standards are hitting us now.”

The township will need a new operating permit in 2017, Andree said.

According to the manager, township officials want to have the project bid out to contractors by early next year. They are targeting 2017 as the completion date.

Another reason for the expansion is population growth. There are more than 30,000 residents in the township according to estimates, Andree said, and that number is expected to climb past 50,000 people by 2030.

The Brush Creek facility is more than 15 years old and can treat more than 4.5 million gallons of water each day. Under the new state requirements, Cranberry will have to increase that capacity.

Comments from residents will be passed on to the township supervisors at their Feb. 26 meeting.

Andree said they could vote March 6 on which plan to pursue.