GROTON — It is the end of the line for town wastewater near Four Corners.

The long-awaited sewer line is now operational and local businesses are tapped in. It is technically the start of the line, which will have a maximum capacity of 40,000 gallons per day.

On July 27, 2017, a groundbreaking ceremony was held at the intersection of Boston and Sandy Pond roads to kick off the development of a high-capacity sewer line. The sewer line, a network of 4-inch and 8-inch pipes, allows for commercial and retail establishments to move in.

The new line is a shared public utility funded in large part by state grants. Two businesses have opened. Nashoba Family Medicine opened an 8,000-square-foot facility in early June and is adjacent to a new bank and a proposed Dunkin’ Donuts.

Tom Orcutt, vice chairman of the Groton Sewer Commission, said in an email, “The project is anticipated to bring new commercial growth to the Four Corners Village district.

The Four Corners system, which is independent of the downtown Groton system, channels the effluvium, using low pressure and gravity, along Westford Road through to Ayer, where it connects with that system before being treated at the Ayer Wastewater Treatment Facility on Brook Street.

The sewer system was established in 2015, then expanded to reach the Four Corners area. Without a modern sewer system, commercial development had stagnated. Individual septic systems are traditionally used for homes and not suitable for the demands of heavy traffic flow in retail centers and commercial hubs.

Another expansion is planned to connect a proposed housing development, Robin Hill, behind Shaw’s plaza, to the main network. That development, which when finished will include 24 homes for 55-year-olds and above along with the existing single-family homes, helped the town’s position when it applied for the grant.

“The Robin Hill development helped increase the grant score,” said Town Planner Takashi Tada. “The proposed residential development showed a bigger need for the funding.”