Clairvest Group, with participation from LPs it controls, has backed Winters Bros. Waste Systems of Long Island (WBLI) with $25.6 million. The investment will be used to support the company's acquisition of the Long Island operations of Progressive Waste Solutions; Clairvest's portion of the investment was $7.7 million. WBLI is a provider of commercial, industrial and residential waste collection services, operating a network of transfer and recycling facilities across Long Island. The investment marks the first from Clairvest Equity Partners V, a $560 million vehicle that closed in July.