WOODBURY - Nassau County Executive Ed Mangano has reached a multimillion-dollar deal for Nassau's sewer system to be managed by a private company.

Mangano reached the deal with New Jersey-based United Water. The $57.4 million-a-year agreement will let United Water operate the county’s wastewater treatment plants, pumping stations and sewers.

Mangano says the deal will save the county more than $230 million over 20 years and improve environmental protection.

The deal still needs the approval of NIFA and the Legislature.