Semiconductor fabs use highly purified water to rinse wafers between process steps, prepare some chemicals, clean equipment, and support operations such as cutting and grinding. Once water carries away process residues, it becomes wastewater. Fabs do not treat all of it alike: they separate streams, apply controls suited to their contaminants and discharge route, and may reuse some water where its quality is suitable.
Why semiconductor manufacturing needs water
Wafer fabrication involves repeated steps that leave residues on wafers or equipment. High-purity, often deionized, water is used for rinsing and cleaning; water also supports chemical preparation, some exhaust-control functions, equipment cleaning, and cutting or grinding. In those cutting and grinding operations, it can cool and lubricate while carrying away removed material. These uses are described in the U.S. Environmental Protection Agency’s Electrical and Electronic Components Effluent Guidelines materials, including a technical document from 1983; that older account is process context, not a description of every modern fab.
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Water quality matters because a wafer process can be sensitive to contamination, and reliable supply matters because water is used at many points. The sources cited here do not establish a current, representative water-use figure for modern fabs.
How water becomes fab wastewater
Water becomes wastewater when it carries away chemicals, particles, or other process residues. The EPA describes wastewater from operations such as etching, cleaning, degreasing, cutting, and grinding. Etch and cleaning rinses can contain chemical residues; cutting and grinding water can carry particles or slurry. The exact mix depends on a facility’s processes and chemistry.
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Pollutants identified in the broader electrical and electronic components category include fluoride, arsenic, and organic compounds. The EPA’s 1983 technical document describes hydrofluoric acid as a fluoride source and notes that solvents used in drying, photoresist development or stripping, and cleaning can contribute organic compounds. Those examples explain possible sources; they do not establish the contaminant profile of any particular facility today.
How fabs treat different wastewater streams
There is no single treatment train used by every fab. Facilities manage water according to its chemistry, intended destination, and applicable requirements. Examples in the EPA’s 2022 facility survey include:
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- pH adjustment or neutralization to bring a stream within suitable limits for further treatment or discharge.
- Clarification and filtration to separate suspended material.
- Chemical precipitation to remove contaminants such as fluoride or metals.
- Specific metals controls, including copper treatment at surveyed facilities.
- Reuse of selected rinse water where its quality and the receiving use allow it.
These are facility examples, not a list of steps required at every site. A stream with fluoride, metals, organics, or particles may need different controls from a relatively clean rinse stream. Treatment also depends on whether water is being prepared for reuse, sent to a municipal treatment plant, or discharged directly.
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Some water can be reused rather than treated as waste and discharged. The EPA’s 2022 survey documents examples of rinse water reused in later rinse stages and water used in cooling towers or scrubbers. Other possible uses depend on site conditions and water quality. Reuse is not simply a matter of treating water once: the receiving process must be able to tolerate what remains in it.
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Returning reclaimed water to an ultrapure-water (UPW) system can be more demanding than using it elsewhere. Contaminants that are acceptable for one application may create reliability or product-quality risks in high-purity treatment or wafer processing. A site-specific EPA-hosted Motorola/University of Texas project report from 2001 recommended using treated water in another process rather than returning it to UPW treatment, citing sodium-related concerns. Its reported 1.3-year return on investment applied to that project and should not be treated as a typical payback period for fabs.
For a broader supply example, Singapore’s NEWater provides advanced-treated water to water-intensive industries, including semiconductor manufacturing. The EPA summary describes source control, online detection of volatile organic compounds in wastewater networks, continuous online monitoring, and at least nine hours of storage before water is distributed or added to reservoirs. Those safeguards describe Singapore’s system, not universal requirements for fabs.
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How U.S. discharge requirements apply
In the United States, semiconductor manufacturing falls within the Electrical and Electronic Components category regulated under 40 CFR Part 469. The route depends on where wastewater goes:
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- Indirect discharge: Wastewater sent to a publicly owned treatment works is subject to pretreatment controls.
A facility’s permit, local limits, process, and discharge route determine the requirements that apply; a generic description of fab treatment does not establish any individual facility’s compliance obligations. EPA’s page, last updated March 17, 2026, says its detailed review did not demonstrate a need to revise the existing rule at that time. It also says the PFAS monitoring data it reviewed were limited and that additional data are expected to be considered in future reviews. That status statement does not resolve every PFAS question or establish the discharge conditions of every fab.
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What the available figures do—and do not—show
The 1983 EPA development document reports historical subcategory totals of 193 million liters (51 million gallons) per day of process-water use and average process-wastewater flow of 594,000 liters (157,000 gallons) per day in its sampled regulatory record. These are dated category figures, not current fab-wide benchmarks or measurements of a typical modern facility. The cited sources do not establish a current representative water-intensity figure for semiconductor fabs.
When assessing a reuse proposal or treatment plan, the useful comparison is site-specific: identify the stream’s contaminants and variability, the intended reuse or discharge destination, potential effects on high-purity systems and product quality, applicable permit or pretreatment limits, and the full treatment and operating requirements.
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