| #R001 | operational | operational | mandatory | Applicability of Technology-Based Standards | wastewater | These technology-based standards apply regardless of whether or not the publicly owned treatment works (POTW) has an approved pretreatment program or whether or not the nondomestic discharger has been issued a control mechanism or permit. | regardless of whether or not the publicly owned treatment works (POTW) has an approved pretreatment program or whether or not the nondomestic discharger has been issued a control mechanism or permit | high |
| #R002 | administrative | unknown | mandatory | Pesticide Discharge NPDES Compliance | aquatic life, other | Point source discharges of biological pesticides and chemical pesticides that leave a residue in waters of the U.S. are required to comply with NPDES requirements. | Point source discharges of biological pesticides and chemical pesticides that leave a residue in waters of the U.S. | high |
| #R003 | administrative | unknown | recommended | Regulatory Agency Consultation | other | Operators in those states or territories should contact their appropriate environmental regulatory agency for more information on permit requirements. | Operators in states or territories where EPA authorizes the state or territory to develop and issue pesticide permits. | high |
| #R004 | operational | operational | guidance | Wet Weather Flow Maximization | wastewater | The CSO policy encourages municipalities with combined sewers to maximize wet weather flows to the treatment plant in order to decrease uncontrolled overflows in the collection system. | municipalities with combined sewers | high |
| #R005 | prohibition | operational | mandatory | Combined Sewer Construction Restriction | wastewater | State and local authorities generally have not allowed the construction of new combined sewers since the first half of the 20th century. | new sewer construction | high |
| #R006 | reporting | treatment | mandatory | NPDES Discharge Limit Compliance | wastewater | NPDES permits establish discharge limits and conditions for discharges from municipal wastewater treatment facilities to waters of the United States. | discharges to waters of the United States | high |
| #R007 | treatment | treatment | mandatory | Secondary Treatment Standards | wastewater | Secondary Treatment Standards - Minimum, technology-based standards for discharges from municipal wastewater treatment facilities. | discharges from municipal wastewater treatment facilities | high |
| #R008 | treatment | treatment | mandatory | National Pretreatment Program Standards | wastewater | The national pretreatment program identifies specific discharge standards and requirements that apply to sources of nondomestic wastewater discharged to a POTW. | sources of nondomestic wastewater discharged to a POTW | high |
| #R009 | administrative | reporting | guidance | Integrated Planning Opportunity | wastewater | integrated planning offers a voluntary opportunity for a municipality to propose to meet multiple CWA requirements by identifying efficiencies from separate wastewater and stormwater programs and sequencing investments. | voluntary opportunity for a municipality | high |