Identify the system and purpose
State whether the sample supports routine monitoring, a targeted investigation, treatment evaluation or another program requirement. Include the system and sample identifiers needed for reporting.
Use the applicable analytical pathway
Drinking-water method approval and laboratory scope depend on the analyte and jurisdiction. A method used for an environmental investigation is not automatically the required drinking-water compliance method.
Prepare the collection plan
Define source or distribution locations, sampling instructions, bottle sets and timing. Some measurements describe field conditions and should be planned as field measurements rather than inferred from a delivered bottle.
Keep reporting aligned
Record the requested units, limits and sample purpose. Interpret a targeted result as evidence for that target and sample, rather than a complete assessment of all water quality.
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.