Non-potable water can be from several sources but I seriously doubt that it's recycled sewer water, why? It's just too expensive for a truck stop to install. Untreated well water is a possibility as filtering and treating well water to wash a semi isn't cost effective either. Another common reason for the non-potable label is a good water source that is used for things that may contaminate the hose and spigot therefor contaminating the water. Personally I would drain and bleach treat the tanks a few times. If it's a concern have the tank water tested.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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