Koinonia Foster Homes Koinonia Group Home 1 is an extended-stay residential treatment program located in Loomis that offers substance abuse treatment and other drug rehab services. Located in Loomis, California, Koinonia Foster Homes Koinonia Group Home 1 provides special treatment drug and alcohol rehab programs for teens struggling with addiction. Koinonia Foster Homes Koinonia Group Home 1 accepts self payment as payment for drug and alcohol rehab services.