I disagree with Ryan, and note that just because a previous auditor doesn't note something as a finding, does not mean that it isn't.
Hoses conveying water to be used for sanitation purposes are food contact surfaces, even if they aren't used solely to add water to the product. They represent a potential point of contamination. It is on you to prove that the materials used in the hose are appropriate for use in food. Typically, if there isn't an NSF or other indicator of the material on the hose, it will get rejected by an astute inspector.
Here are the applicable portions of the code:
188.8.131.52 Product contact surfaces and those surfaces not in direct contact with food in food handling areas, raw material storage, packaging material storage, and cold storage areas shall be constructed of materials that will not contribute a food safety risk.
184.108.40.206 Equipment and utensils shall be designed, constructed, installed, operated and maintained to meet any applicable regulatory requirements and not to pose a contamination threat to products.
Here are the FDA requirements:
21 CFR 117.37
(a) Water supply. The water supply must be adequate for the operations intended and must be derived from an adequate source. Any water that contacts food, food-contact surfaces, or food-packaging materials must be safe and of adequate sanitary quality.
(b) Plumbing. Plumbing must be of adequate size and design and adequately installed and maintained to:
(3) Avoid constituting a source of contamination to food, water supplies, equipment, or utensils or creating an unsanitary condition.
21 CFR 117.40
(a)(1) All plant equipment and utensils used in manufacturing, processing, packing, or holding food must be so designed and of such material and workmanship as to be adequately cleanable, and must be adequately maintained to protect against allergen cross-contact and contamination.
(2) Equipment and utensils must be designed, constructed, and used appropriately to avoid the adulteration of food with lubricants, fuel, metal fragments, contaminated water, or any other contaminants.
(5) Food-contact surfaces must be made of nontoxic materials and designed to withstand the environment of their intended use and the action of food, and, if applicable, cleaning compounds, sanitizing agents, and cleaning procedures.
Prove it's made of nontoxic materials appropriate for use in food, otherwise get a different hose.