Use a complete sample identifier
Give every location or collected sample a unique project ID. The bottle label and custody form should use the same identifier without requiring interpretation at receipt.
Record collection details
Include the matrix, location, date, time, sampler and requested testing. Keep fractions, preparation requirements and project identifiers explicit.
Document transfers
Use the applicable custody procedure to record relinquishment and receipt. Do not treat a shipping label as a substitute for the sample and testing record.
Flag deviations
Record delays, temperature concerns, damaged containers or collection changes. Those details support the laboratory’s review of whether the sample can answer the intended question.
Related testing & guidance
Technical & service references
Vanguard water-testing menuEPA: Clean Water Act method questionsEPA: Drinking-water analytical methodsSource review: November 8, 2026. The agreed method and project scope govern the testing.