Chicken Taco Soup #2

6-8 chicken breasts, cooked, shredded
2, 15 oz. cans whole kernel corn. drained
2, 15 oz. cans pinto beans, drained
15 oz. can black beans, rinsed and drained
2, 15 oz. cans crushed tomatoes
2 cans Rotel tomatoes
 2 pkgs. Hidden Valley Ranch dressing mix
1 pkg. taco seasoning
1 onion, chopped fine
5-8 c. water

Place all ingredients in crockpot. Cook on low 3-4 hours.