| recharge rate | Recharge Rate: Fueling the Earth's Unde… | Sustainable Water… |
| reciprocating rake bar screen | Reciprocating Rake Bar Screens: A Relia… | Wastewater Treatm… |
| reclaimed water | Reclaiming the Future: The Rise of Recl… | Sustainable Water… |
| Recla-Mate | Recla-Mate: A Modular Solution for Wate… | Water Purification |
| reclamation | Reclaiming Our Future: The Vital Role o… | Resource Manageme… |
| Recla-Pac | Recla-Pac: A Solution for Compact Biolo… | Wastewater Treatm… |
| RECOjet | RECOjet: A Powerful Tool for Environmen… | Air Quality Manag… |
| recombinant bacteria | Recombinant Bacteria: Tiny Allies in th… | Environmental Hea… |
| recombinant DNA | Recombinant DNA: A Powerful Tool for En… | Eco-Friendly Tech… |
| recommended maximum contaminant level (RMCL) | Understanding Recommended Maximum Conta… | Environmental Hea… |
| reconstructed source | Reconstructed Sources in Environmental … | Environmental Pol… |
| record of decision (ROD) | Understanding the Record of Decision: A… | Environmental Pol… |
| recovery | Understanding Recovery in Reverse Osmos… | Sustainable Water… |
| recovery rate | Understanding Recovery Rate: A Key Metr… | Waste Management |
| recreational waters | Recreational Waters: Where Fun Meets En… | Sustainable Water… |
| Rectangulaire | The "Rectangulaire" Legacy: A Look at U… | Wastewater Treatm… |
| recycle ratio | The Recycle Ratio: A Key Parameter in W… | Wastewater Treatm… |
| recycling | Recycling: A Vital Tool in Environmenta… | Waste Management |
| red bag waste | Red Bag Waste: The Critical Role of Pro… | Environmental Hea… |
| Red-B-Gone | Red-B-Gone: A Powerful Tool for Environ… | Water Purification |
