Nassau County and Hempstead Village officials are building a $22 million sewage pump system to divert stormwater and sewer overflow from Hempstead, Baldwin and East Meadow.

The pump station system will carry sewage overflow to Nassau County’s Cedar Creek Water Pollution Control Plant in Wantagh and is designed to reduce flooding along Barnes Avenue, where several homes in Baldwin flooded after superstorm Sandy. Several residents sued the county for flooding damage after the 2012 storm.

Work began last month when crews began digging to locate utilities and it is scheduled to be completed next year. The system is designed to handle 12 million gallons per day.

The county is paying Freeport contractor Peter Scalamandre & Sons, Inc. $15,327,000 for the main work; upstate New York Peekskill company Stratis Contracting Corp. is being paid $6,880,000 for the pump station construction.

County officials said the new flow diversion pump station will transfer about half of Hempstead’s wastewater east to a connection point where it will be diverted to the county plant in Wantagh.

The new pump station is being built on a 5,000-square-foot, county-owned parcel and will include a 3-mile-long main pipe at Ingraham Street that runs along Jerusalem Avenue and Front Street in Hempstead and will run under Meadowbrook Parkway.

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Hempstead Village Mayor Wayne Hall said the pump system is vital for the village’s aging infrastructure and to accommodate hundreds of new residents with the planned $2 billion Hempstead downtown revitalization project with Plainview- based developer Renaissance Downtowns.

“Our infrastructure has been around for a long time and when the pipes were laid down, they were for a certain population,” Hall said. “We’ve grown from that and we need to accommodate the growth of the village.”

Improvements are also planned for the village’s Newmans Court pump station. The village would maintain its Weekes Park pump station.

Village officials received part of a $5 million Empire State Development grant to address sewage needs. The new pumping station will ease the stress of handling 10 million gallons of sewage by redistributing some of the wastewater to Cedar Creek.