| EventCode | EventName | EventDescr | LastUpdateDate |
| BA | Bioassessment | Data grouping for bioassessment collections | 2007-09-01 |
| NONENV | NonEnvironmental | Data grouping for non environmental collections. | 2011-07-15 |
| TI | Tissue Analysis | Data grouping for tissue collections | 2007-09-01 |
| TS | TimeSeries | Regular interval time series data | 1900-01-01 |
| WQ | Water Quality | Data grouping for water, sediment, toxicity, and benthic abundance collections | 2007-09-01 |