Syracuse-based Helio Health has entered Utica’s substance abuse treatment landscape in a big way. The nonprofit and the board of directors of Insight House in Utica, which offers the county’s only residential treatment program, currently are exploring the feasibility of affiliation or a merger, said Insight House President & CEO Donna Vitaglione, adding that both sides are exercising due diligence. But she was clear that no memorandum of understanding has been signed.