Leaking water out of back hatch when I turn on windshield washer

Most likely it's the hose that goes to the washer nozzle for the rear window. That hose comes from the main body of the vehicle to the nozzle on the back door. It passes through the rubber tube that you can see with the door open. The hose is probably broken from years of flexing and moving every time the door is opened and closed. Hope that helps! Jim

Common problem, the hose probably popped off the nozzle like mine did. The hose is really too short, I coupled a longer hose in there. Easy cheap fix.