Category 1 water originates from a sanitary source and does not pose sustantial risk from dermal, ingestion, or inhalation exposures. Howerver, once clean water leaves theexit point, it might not remain clean once it contacts other surfaces or materials.
The standard does NOT say that the water must be drinkable to be a category 1 loss. It must come from a sanitary source and not have gathered any significant contamination after leaving the pipe or hose. Some factors that influence the water's cleanliness are the current use of the structure (such as a privte home), the general condition of the structure, previous water losses, and the age and history of the structure.
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