| Reporter | Diving Deep: The "Reporter" in Environm… | Water Quality Mon… |
| repowering | Repowering: Breathing New Life into Agi… | Sustainable Water… |
| representative sample | Representative Samples: The Cornerstone… | Environmental Hea… |
| reserve capacity | Building for the Future: Reserve Capaci… | Waste Management |
| reservoir | Reservoirs: The Unsung Heroes of Water … | Sustainable Water… |
| residence time | Residence Time: A Crucial Factor in Env… | Water Purification |
| residual | The Lingering Footprint: Residuals in E… | Environmental Hea… |
| residual chlorine | The Power of the Leftovers: Understandi… | Water Purification |
| residual disinfectant concentration | Residual Disinfectant Concentration: Ke… | Water Purification |
| residual risk | The Unseen Threat: Residual Risk and th… | Air Quality Manag… |
| residue | Understanding Residue: A Key Component … | Waste Management |
| resin | Resins: The Unsung Heroes of Environmen… | Water Purification |
| Resinator | The Heart of Water Treatment: Resins an… | Water Purification |
| resin beads | The Tiny Powerhouses of Clean Water: Re… | Water Purification |
| resistance | Resistance: A Silent Indicator of Water… | Water Purification |
| resistivity | Resistivity: Unmasking the Purity of Wa… | Water Quality Mon… |
| Resi-Tech | Resi-Tech: Revolutionizing Environmenta… | Air Quality Manag… |
| Resolv-R2 | Resolv-R2: Revolutionizing Solvent Reco… | Environmental Hea… |
| Resource Conservation and Recovery Act (RCRA) | Keeping Our Environment Clean: Understa… | Environmental Pol… |
| resource recovery | Resource Recovery: Giving Waste a Secon… | Waste Management |
