Across the industrial, commercial, and technology sectors, a profound shift is underway in how facilities think about water. With increasing attention on water consumption, drought vulnerability, infrastructure limitations, and the environmental footprint of large operations such as data centers, water reuse has moved from an optional sustainability measure to an operational imperative.Organizations are now expected to reduce their reliance on potable water, protect local supplies, and work toward water neutral or water positive operations.
Meeting these expectations requires reevaluating where water comes from, how it moves through a facility, and how often it can be reused before leaving the site. Within this context, alternative water supplies such as rainwater and stormwater offer some of the most promising and practical solutions.
The Growing Role of Rainwater and Stormwater in Industrial Cooling
Cooling systems remain the largest single driver of water demand for many industrial and commercial facilities. Incorporating harvested rainwater or captured stormwater into these operations can significantly reduce pressure on municipal systems.
Rooftop rainwater collection can support cooling towers, adiabatic cooling units, and evaporative cooling systems. In addition, stormwater from paved areas and parking lots can be captured, treated, stored, and used as cooling makeup water. When combined with onsite storage or underground cisterns, these systems can help facilities maintain a steady non-potable water supply throughout seasonal rainfall variations, reducing reliance on drinking water while improving operational resilience.
Tapping Underused Sources: Condensate and Process Water
Many facilities generate non-traditional water sources that often go unused. Data centers, for example, produce substantial volumes of HVAC condensate that is typically discharged even though it is relatively clean. Capturing this water and reusing it for cooling makeup, equipment washing, or other non-potable applications can meaningfully reduce potable water demand and improve overall efficiency. Process water that has already served an initial purpose within industrial operations can also be treated and reused for lower quality applications, extending its usefulness before disposal.
Eliminating Potable Water Use in Non-Potable Applications
Across the country, facilities regularly use drinking water for tasks that do not require it. Common examples include landscape irrigation, cooling, toilet flushing, and equipment cleaning. Transitioning these functions to non-potable supplies such as harvested rainwater, stormwater, reclaimed water, or treated graywater reduces strain on public systems and supports sustainable operations.
For irrigation in particular, selecting drought tolerant plants and using drip systems and soil moisture monitoring can further reduce water use and maintain healthy landscapes.
The Power of Cascading Water Use
Some facilities are adopting a more integrated approach that allows water to be used multiple times at different quality levels. Rainwater might first serve a high demand cooling function, then be reused for irrigation, and finally be sent to an onsite treatment system before infiltration or final reuse.
With real-time monitoring and smart controls, this approach reduces total water withdrawals and protects local waterways by minimizing discharges. This systems based strategy is part of what I refer to as Cascade Water Cycling, a framework that extends the value of each gallon of water by matching water quality to its intended use, incorporating alternative sources, and reducing potable demand as well as environmental impacts.
From Efficiency to Resilience
Achieving water positive operations is not accomplished through a single technology. It requires a broader mindset in which water is viewed as a reusable asset rather than a one-time input.
For ARCSA members, this perspective aligns with the core principles of responsible rainwater and stormwater harvesting:
- Use water at the quality required for the task.
- Capture and store alternative sources whenever possible.
- Integrate multiple supply streams to reduce pressure on potable water.
- Design facilities with reuse in mind rather than disposal.
By diversifying supply sources, designing smarter systems, and treating water as a cyclical resource, facilities can reduce environmental impact, protect public supplies, and build long-term resilience.
Explore These Strategies Further at the 2026 ARCSA Technical Symposium
Many of the concepts discussed in this column, including alternative water sourcing, non-potable distribution, and resilient system design, will be explored in greater depth at the 2026 ARCSA International Technical Symposium. The event will take place May 20-21 at the headquarters of Grundfos in Brookshire, Texas.
This year’s symposium will also include a dedicated Expo Exchange and Networking Event. The expo will provide companies and organizations with an opportunity to present their products, technologies, and solutions to a highly engaged audience of rainwater and stormwater professionals. It will also give attendees a chance to connect with innovators, explore new ideas, and learn about tools that support decentralized and sustainable water practices.
A limited number of expo tables are available, along with sponsorship opportunities designed to support industry education and visibility. Organizations interested in participating are encouraged to secure their space early.
More information and registration details are available at: https://arcsainternational.org/news/arcsa-international-technical-symposium
Last modified: April 15, 2026