| W/O | W/O: Understanding the Role of Water-in… | Environmental Hea… |
| work | Work: The Unsung Hero of Environmental … | Wastewater Treatm… |
| work exchanger | Work Exchangers: Harnessing Energy for … | Sustainable Water… |
| working level month (WLM) | Understanding Working Level Months (WLM… | Environmental Hea… |
| working load | Understanding Working Load in Environme… | Environmental Hea… |
| worm | The "Worm" in Water Treatment: A Twist … | Water Purification |
| worm gear | Worm Gears in Environmental & Water Tre… | Water Purification |
| WPCF | WPCF: A Legacy of Clean Water and Susta… | Sustainable Water… |
| WPCP | WPCP: The Unsung Hero of Clean Water … | Wastewater Treatm… |
| WQA | WQA: A Crucial Tool for Waste Managemen… | Environmental Pol… |
| WQS | WQS: Protecting Our Waterways, One Stan… | Environmental Pol… |
| WRDA | WRDA: Shaping the Future of Water Resou… | Environmental Pol… |
| WRI | WRI: A Global Leader in Sustainable Was… | Resource Manageme… |
| Wring-Dry | Wring-Dry Technology: Optimizing Wastew… | Wastewater Treatm… |
| WSA | WSA: A Legacy of Waste Management Exper… | Waste Management |
| WSF | Understanding WSF: The Water Soluble Fr… | Waste Management |
| WSRA | Preserving Our Wild Heritage: The WSRA … | Environmental Pol… |
| WSTA | WSTA: An Essential Partner in Waste Man… | Wastewater Treatm… |
| WSTB | WSTB: A Guiding Force in Water Sciences… | Sustainable Water… |
| W&T | W&T: A Legacy in Water Treatment and Wa… | Water Purification |
