| #D001 | | Aquatic life criterion | An aquatic life criterion for toxic chemicals is the highest concentration of a pollutant or parameter in water that is not expected to pose a significant risk to the majority of species in a given environment or a narrative description of the desired conditions of a water body being "free from" certain negative conditions. | high |
| #D002 | | Human health criteria | Human health criteria are the highest concentration of a pollutant or parameter in water that is not expected to pose a significant risk to people. | high |
| #D003 | | Water Quality Criteria | Criteria help protect water bodies by identifying pollutant levels or conditions that support the designated uses. | high |
| #D004 | | RWQC | recreational water quality criteria | high |
| #D005 | | Numeric Nutrient Criteria | Water quality criteria for nitrogen and phosphorus help to protect water bodies and restore those that are impaired by nutrient pollution. | high |
| #D006 | | .gov | official government organization in the United States | high |
| #D007 | | CGP | Construction General Permit | high |
| #D008 | | MSGP | Multi-Sector General Permit | high |
| #D009 | | NPDES | National Pollutant Discharge Elimination System | high |
| #D010 | | National Water Reuse Action Plan (WRAP) | The National Water Reuse Action Plan (WRAP) is an organizing framework that defines actions intended to drive progress on reuse and address local and national barriers. These actions tackle a range of topics including technical, institutional, and financial barriers. | high |
| #D011 | | HTTPS | means you’ve safely connected to the .gov website | high |
| #D012 | | EPA | Environmental Protection Agency | high |
| #D013 | | Central Data Exchange | a central point which supplements EPA reporting systems by performing new and existing functions for receiving legally acceptable data in various formats, including consolidated and integrated data. | high |
| #D014 | | U.S. Government information system | includes systems operated on behalf of the U.S. Government; | high |
| #D015 | | CDX | Central Data Exchange | high |