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Non-potable water is water not fit for human consumption. It may be suitable for other purposes. It can be harmful if consumed.
Not harmful unless to come in contact with the water. Even then it may only be harmful if you consume the water. Walking by the tanks poses no risk.
It's a broad classification. Like I said before it's not fit for human consumption. How toxic is not specified by the non-potable label.
Like I said before it can mean any water not fit for human consumption. That's all it means. There's no way to answer your last question.