Laboratories must have what to submit drinking water sample results using DWELR?

• A. License number
• B. Certification
• C. Lab ID
• D. EPA approval code

Answer: (C)

DWELR requires a unique Lab ID for submitting drinking water results. This ID ties each result to the specific laboratory that performed the analysis, enabling proper attribution, traceability, and quality-control checks in electronic reporting. Licensing numbers, certifications, or EPA approval codes may exist for compliance, but they aren’t the identifier used to submit data in DWELR. The Lab ID ensures results are correctly linked to the correct laboratory, which is essential when multiple labs might process samples for a given facility.