Yes, the iPhone 7 and iPhone 7 Plus both are rated IP67 under IEC standard 60529. The IP67 rating means both models are able to be immersed in water up to 1m for 30 minutes, and are fully protected from dust and other solid materials, such as dirt and sand.
This means the iPhone 7 is the first iPhone model to be safe to bring to the beach and near other water related activities.
You can learn more about the IP67 rating here.
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