1. In a large pot, brown the ground beef over medium heat. Drain off any excess fat.
2. Add the onion, celery, green bell pepper, and garlic to the pot. Cook until the vegetables are tender.
3. Stir in the chili powder, cumin, salt, black pepper, oregano, and sugar. Cook for another minute.
4. Add the kidney beans, pinto beans, tomato sauce, diced tomatoes, and water. Stir well to combine.
5. Bring the mixture to a boil, then reduce the heat and let it simmer for about 1 hour, stirring occasionally.
6. Adjust seasoning to taste and serve hot.