An operation producing and packing potatoes for processing uses water to flume, wash and final rinse potatoes. Water is also used to clean the packing line and for hand washing. Does this operation need to test all of these water uses?

No. Potable water is not required for any uses in an operation handling potatoes for processing EXCEPT for hand washing. The only water test needed is of water used for hand washing. However, if hand sanitizer is used after hand washing (and drying with paper towel), then potable water is not required. This means the operation would not have to do ANY water tests.