Why is chain-of-custody documentation important for stormwater sampling?

• A. It speeds up the sampling process.
• B. It ensures sample integrity and legally defensible results by documenting who collected, handled, stored, and transported samples.
• C. It improves taste of water.
• D. It reduces the number of samples needed.

Answer: (B)

Chain-of-custody documentation keeps track of every person who handles a sample and every step it goes through—from collection to lab analysis. In stormwater sampling this is crucial because the results are used for regulatory decisions and potential enforcement. By recording who collected the sample, how it was stored, preserved, and transported, and when each handoff occurred, you create a verifiable trail that the sample hasn’t been tampered with or degraded. This makes the results legally defensible and defensible in court or regulatory hearings, and it helps identify any point where contamination or mislabeling could have occurred. It also ensures the sample remains representative of the conditions at the time and place of collection, since temperature control, storage, and timely transport can all affect test outcomes. In short, the chain-of-custody is about maintaining integrity and accountability throughout the sampling process. It isn’t primarily about speeding up work, improving taste, or reducing how many samples you collect.