Which information must always be included on a sample label?

• A. Weather conditions when the sample was analyzed
• B. Date, time, location of sample collection
• C. Name, address, phone number of treatment facility
• D. Name or initials of person running the analysis

Answer: (B)

The main idea is that a sample label must identify exactly when and where the sample came from so results can be traced and interpreted correctly. Including the date, time, and location of collection provides a precise reference for every analysis: you know the exact moment and place the sample was taken, which is essential for regulatory compliance, comparing results over time, and linking data to the right site or point in the process. Weather conditions aren’t universally required on a label and are more often noted separately if needed. The facility’s contact details and the analyst’s initials can be helpful for accountability, but they aren’t universally mandated on every label. So, the information that ensures clear identification and traceability is the date, time, and location of sample collection.