| #Q001 | administrative | reporting | mandatory | Assemble and Maintain National Contaminant Occurrence Database | drinking water, other | Some of the datasets in this clearinghouse help fulfill the EPA's requirement under the Safe Drinking Water Act to assemble and maintain a National Contaminant Occurrence Database. | Under the Safe Drinking Water Act | low |
| #Q002 | administrative | operational | mandatory | Certify Risk and Resilience Assessment and Emergency Response Plan | drinking water | Users can access community water system compliance data for requirements to certify the Risk and Resilience Assessment (RRA) and Emergency Response Plan (ERP) under section 1433 of the Safe Drinking Water Act (SDWA), which was amended by section 2013 of America's Water Infrastructure Act (AWIA). | Under section 1433 of the Safe Drinking Water Act (SDWA), which was amended by section 2013 of America's Water Infrastructure Act (AWIA) | low |
| #Q003 | administrative | reporting | mandatory | NPDES Permit Incorporation for Direct Dischargers | wastewater | The regulation only applies to direct dischargers. The Effluent Guidelines are incorporated into NPDES permits. | Applies to direct dischargers defined as point sources discharging to waters of the United States | high |
| #Q004 | administrative | operational | mandatory | Control Mechanism Incorporation for Indirect Dischargers | wastewater | The Effluent Guidelines and Standards are incorporated into permits or other control mechanisms for indirect dischargers (visit Pretreatment Program). | Applicable to facilities that discharge pollutants to a publicly owned treatment works (municipal sewage treatment plant). | high |
| #Q005 | prohibition | treatment | mandatory | Zero Discharge Requirements for Wastestreams | wastewater | Some wastestreams have zero discharge requirements. | Varies by subcategory as defined in 40 CFR Part 418 | high |