| #D001 | | direct dischargers | A point source that discharges pollutants to waters of the United States, such as streams, lakes, or oceans. | high |
| #D002 | | indirect dischargers | A facility that discharges pollutants to a publicly owned treatment works (municipal sewage treatment plant). | high |
| #D003 | | Aluminum forming | The deformation of aluminum or alloys into specific shapes by hot or cold working such as rolling, extrusion, forging, and drawing. | high |
| #D004 | | small extrusion and small drawing with emulsions or soaps facilities | Extrusion facilities that extrude less than 3 million pounds of product per year and draw with emulsions or soaps less than 1 million pounds per year [40 CFR 467.01(c)] | high |
| #D005 | | NAICS | North American Industrial Classification System | high |
| #D006 | | TTO | total toxic organics | high |
| #D007 | | SDWIS | the EPA’s system of record for Safe Drinking Water Act data; it includes data on public water system characteristics and compliance with SDWA regulations. | high |
| #D008 | | SFRS | Safe Drinking Water Information System (SDWIS) Federal Reporting Services | high |
| #D009 | | UCMR | Unregulated Contaminant Monitoring Rule | high |
| #D010 | | DWMAPS | Drinking Water Mapping Application to Protect Source Waters | high |
| #D011 | | ECHO | Enforcement and Compliance History Online | high |
| #D012 | | ADWR | Aircraft Drinking Water Rule | high |
| #D013 | | AWIA | America's Water Infrastructure Act | high |
| #D014 | | SDWA | Safe Drinking Water Act | high |
| #D015 | | RRA | Risk and Resilience Assessment | high |
| #D016 | | ERP | Emergency Response Plan | high |
| #D017 | | DWINSA | Drinking Water Infrastructure Needs Survey and Assessment | high |
| #D018 | | CCR | Consumer Confidence Report | high |
| #D019 | | GPRA | Government Performance and Results Act | high |
| #D020 | | NCOD | houses the Six-Year Review of national drinking water regulations data, the unregulated contaminant occurrence data, and the ambient and/or source water data. | high |
| #D021 | | ROE | Report on the Environment | high |
| #D022 | | UIC | Underground Injection Control | high |
| #D023 | | UST | Underground Storage Tank | high |
| #D024 | | Water ICAT | Water Infrastructure and Capacity Assessment Tool; an interactive map that helps users identify drinking water and wastewater utilities that may benefit from assistance. | high |
| #D025 | | WIFIA | Water Infrastructure Finance and Innovation Act | high |
| #D026 | | PFAS | Perfluoroalkyl and Polyfluoroalkyl Substances | high |
| #D027 | | SRF | State Revolving Fund | high |
| #D028 | | IIJA | Infrastructure Investment and Jobs Act | high |
| #D029 | | ROTG | Response On-The-Go | high |