Does water used for washing the inside of buildings (e.g., walls, floors, etc.) have to be tested for potability?
Section 15.1 (Water Assessment) states that the person responsible uses potable water for cleaning buildings, equipment, containers, etc., and that the water sample is taken from the appropriate location (e.g., equipment, tap, storage cistern/tank/container, etc.). Therefore, the testing requirements (as per Section 15.1/15.2/15.3) would depend on where the water comes from right before it is used for cleaning (e.g., from a municipal tap, from a private well tap, from a storage tank/container, from a treated tank, etc.). For example, municipal water from the tap would not have to be tested but if that same water was stored in a tank it must be tested twice annually using a lab that uses appropriate sampling and testing methods to perform analyses in accordance with the applicable requirements of is ISO/IEC 17025 standards. The exception to this requirement is for operations growing potatoes for processing: potable water is not required for cleaning of buildings, equipment, containers, etc.