The approach to water reuse in fabs depends heavily on the composition of different wastewater streams. Rinse water generated during wafer cleaning contains relatively low contaminant levels, making it well-suited for reclamation. Concentrated waste streams from chemical bath replenishment, etch processes, and chemical mechanical planarization carry higher contaminant loads and require more intensive treatment before reuse is viable. Modern fab design handles this by segregating streams at source, routing each to a treatment pathway matched to its chemistry, and reintroducing reclaimed water to the appropriate stage of the production or service water system. The SEMI F98 standard, developed by the SEMI industry association, guides water recycling strategy and provides a framework for standardizing the reporting of reuse metrics across facilities, supporting comparability between sites and transparency for environmental reporting.
Zero-Liquid Discharge and the Architecture of High-Reuse Systems
Zero-liquid discharge takes the closed-loop principle to its logical conclusion. All wastewater generated within the facility boundary is treated to eliminate liquid discharge, with water recovered for reuse and residual solids removed as managed waste. The technology mix required for zero liquid discharge (ZLD) in semiconductor facilities typically combines evaporation, crystallization, and advanced membrane treatment to recover concentrated reject streams that conventional reuse systems cannot economically process. Full ZLD can involve significant capital and energy costs, so facilities generally adopt a phased approach, increasing water recovery rates progressively rather than implementing the entire system through a single capital program.
The regulatory and financial environment is making the case for ZLD investment more compelling. State-level permit conditions in water-stressed jurisdictions increasingly reflect water authorities' push for lower discharge, and the growing sophistication of environmental, social, and governance reporting frameworks means that water withdrawal and discharge figures are increasingly visible to institutional investors. Facilities that can demonstrate high reuse rates and low net freshwater consumption are better positioned in permit renewals, community engagement, and environmental disclosures than those still operating on first-generation water management assumptions. Water efficiency targets are also embedded in the operational commitments that some semiconductor manufacturers have made publicly, holding facility teams accountable for measurable improvement.
The Ultra-Pure Water Summit 2027 examines where closed-loop water technology stands today, what the engineering and operational prerequisites for high-reuse systems look like in practice, and how fabs at different stages of the reuse process are structuring their investment programs. The program connects semiconductor manufacturers with the water treatment vendors, ZLD system providers, and water reuse specialists who are turning net-zero water ambitions into operational reality.
