Place pinto beans into a large pot and pour in enough water to cover by 2 to 3 inches. Let beans soak overnight.
Drain beans, return to pot, and pour in fresh water to cover; add diced tomatoes, bacon, onion, chili powder, cumin, and garlic powder. Bring to a boil, reduce heat to low, and simmer for 3 hours.
Stir cilantro and salt into bean mixture; simmer until beans are soft, about 1 more hour.
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