The collected date, as defined by the United States Environmental Protection Agency via its SEDD Specification Version 5.2, is "the date (and time, if required) the sample was collected. If the sample was collected over a range of dates, this is the start date."
- U.S. Environmental Protection Agency (March 2019). "Appendix A. Data Element Dictionary (DED)" (PDF). SEDD Specification Version 5.2. https://www.epa.gov/sites/default/files/2019-05/documents/sedd_spec_v5-2-march_2019_508.pdf. Retrieved 22 September 2022.