Which item is commonly included on the label of a sample container?

• A. Test to be performed
• B. Color coding of the bottle
• C. Weather forecast
• D. Permit number

Answer: (D)

Labels must provide a way to identify and trace a sample to regulatory requirements. The permit number on the label creates a direct link between the collected sample and the specific permit that governs the discharge, helping labs and regulators know which permit conditions apply, support accurate reporting, and maintain a clear audit trail from collection through analysis. While other information such as what test is to be performed or chain-of-custody details are important, they’re typically documented on forms rather than the bottle label, and weather forecasts don’t relate to the sample’s identity. Color coding helps with handling but doesn’t uniquely identify the sample or its regulatory basis. That’s why the permit number is commonly included on the label.