How the Fashion Industry Pollutes Water: Textile Wastewater, Dyes & Microplastics

The fashion industry pollutes water through textile dyeing, chemical wastewater, pesticide-heavy cotton farming, and microplastics shed from synthetic clothing. While we often hear about fashion’s impact on the climate, its impact on rivers, oceans, drinking water, and nearby communities deserves just as much attention.

As of 2020, the fashion industry uses over 79 trillion liters of water every year. Clothing production uses water at almost every stage, from growing fibers like cotton to dyeing, finishing, washing, and eventually disposing of garments. When that system is built around fast fashion and constant overproduction, the result is more wastewater, more toxic chemicals, and more plastic pollution entering our waterways.

In this guide, we’ll break down how the fashion industry pollutes water, why textile dyeing is such a major problem, how synthetic fabrics contribute to microplastic pollution, and what brands and consumers can do to reduce the damage.

How Does the Fashion Industry Pollute Water?

The fashion industry pollutes water mainly through textile dyeing, chemical finishing, untreated wastewater, pesticide-heavy cotton farming, and microfibers shed from synthetic fabrics like polyester and nylon. These pollutants can enter rivers, oceans, groundwater, and drinking water systems, harming ecosystems, wildlife, garment workers, and nearby communities.

Why Water Pollution Is a Major Problem in Fashion

Clothing relies on water in every stage of its lifecycle, from growing the actual fibers to throwing the clothes away. From production to disposal, the fashion industry has three major negative environmental impacts related to water: high water usage, high levels of chemical pollution, and high levels of physical microfiber pollution.

Main Ways the Fashion Industry Pollutes Water

1. Textile Dyeing and Finishing Pollute Water

One of the biggest sources of water pollution in the clothing production process happens during the wet-processing stage. This is the part of production that takes place after fibers are spun and woven into fabric. During wet processing, fabric is often dyed, printed, washed, treated, and finished before it becomes the clothing we see in stores.

This stage is not only extremely water-intensive, but it can also introduce a long list of chemicals into nearby waterways. Textile processing may involve thousands of synthetic chemicals, including synthetic dyes, salts, heavy metals, bleaching agents, softeners, stain-resistant treatments, wrinkle-resistant finishes, and other finishing chemicals. In fact, the process of turning raw materials into textiles often takes over 8000 different synthetic chemicals.

Dyeing is one of the biggest concerns. Many synthetic dyes are made with chemicals that can be difficult to break down once they enter the environment. Some dyes may also contain heavy metals or toxic compounds that can harm aquatic life and contaminate local water sources.

The problem is not just the dye itself. To help color bind to fabric, dye houses often use large amounts of salts and chemical fixatives. These substances can change the quality of water, making it harder for plants, animals, and nearby communities to rely on those waterways safely.

This is why textile dyeing and finishing are such major concerns in the fashion industry. A colorful garment may look harmless on the rack, but the process used to create that color can leave behind polluted water, toxic sludge, and chemical waste.

2. Untreated Textile Wastewater Enters Rivers and Oceans

Another major issue is what happens after fabrics are dyed, washed, and finished. The water used during clothing production does not simply disappear. It becomes textile wastewater, and when it is not properly treated, it can carry toxic chemicals from textile manufacturing into rivers, lakes, and eventually oceans.

This is one of the most damaging parts of the fashion supply chain. In some manufacturing regions, untreated wastewater from garment factories and dye houses is released directly into nearby waterways. That wastewater can contain leftover dyes, salts, heavy metals, formaldehyde, finishing chemicals, and other pollutants used during clothing production.

It’s estimated that around  20% of global industrial water pollution comes from textile dyeing and treatment. This is especially concerning because many of the communities living near garment factories depend on those same rivers and water sources for drinking water, bathing, farming, and fishing.

The 2016 documentary RiverBlue brought more attention to this issue by showing how textile production has contributed to the contamination of rivers in major garment-producing regions. The film highlighted the enormous amount of wastewater produced by the fashion industry and the lack of regulation in many areas where clothing is made.

When textile wastewater pollution is not properly managed, the damage moves far beyond the factory. Polluted rivers can carry chemicals into larger bodies of water, harming ecosystems, contaminating soil, and affecting the health of people and animals who rely on those water systems.

This is one reason why fashion’s water pollution problem is not just about how much water the industry uses. It is also about what is being put back into the environment after that water is used.

3. Cotton Farming and Water Use

Before clothing is dyed, sewn, or shipped to stores, the fashion industry’s water footprint often begins in the fields. For cotton clothing, this starts with growing the cotton plant itself.

Cotton is one of the most widely used natural fibers in the world, but conventional cotton can be extremely water-intensive. It is often grown in hot, dry regions where irrigation is needed to keep crops alive. This means large amounts of water are pulled from rivers, lakes, aquifers, and groundwater stores to support cotton farming. For conventional cotton clothing, which makes up about 33% of all clothes, this includes growing the cotton. Growing cotton is extremely water-intensive, as it is one of the thirstiest crops.

Simply making one cotton shirt can take up to 2700 liters of water, which is enough drinking water for one person for about two and a half years. When cotton is grown at a massive scale, this water use can place serious pressure on local communities, especially in regions already facing drought or water scarcity.

The problem is not only how much water cotton uses. It is also what can happen to that water after it moves through cotton fields.

Conventional cotton is often grown with synthetic pesticides, herbicides, and fertilizers. When it rains or when fields are irrigated, these chemicals can wash off the land and enter nearby rivers, lakes, and groundwater. This is known as agricultural runoff, and it can contribute to water pollution long before the fabric ever reaches a dye house or garment factory.

Pesticides used in conventional cotton farming can harm soil health, pollinators, aquatic life, and the people living near cotton-growing regions. Fertilizer runoff can also create problems in waterways by contributing to algae blooms and lowering oxygen levels in the water, which can make it harder for fish and other aquatic species to survive.

Irrigation is another major concern. In many cotton-growing areas, water is pumped from underground aquifers faster than it can naturally be replaced. Over time, this can lead to groundwater depletion, leaving less water available for drinking, farming, and local ecosystems.

This is why cotton’s environmental impact is more complicated than simply saying “cotton is natural, so it must be sustainable.” Cotton is biodegradable and plant-based, which is a benefit compared to synthetic fibers like polyester. But when it is grown conventionally, it can still require a lot of water and chemical inputs.

Is Organic Cotton Better?

Organic cotton can be a better option because it is grown without synthetic pesticides and fertilizers. This helps reduce chemical runoff into waterways and can support healthier soil over time. Healthy soil is important because it can hold water more effectively, which may reduce the need for irrigation in some growing systems.

Organic cotton is also often associated with stronger environmental standards, especially when it is certified by programs like GOTS, which looks at both the fiber and parts of the textile processing stage.

However, organic cotton is not perfect. It can still require a significant amount of water depending on where and how it is grown. A cotton crop grown in a water-stressed region may still place pressure on local water supplies, even if it is organic.

This is why the most sustainable choice is not always just “organic cotton.” It is also about buying less, choosing well-made pieces, wearing what we already own, and supporting brands that are transparent about where their cotton comes from, how it is grown, and how the fabric is processed.

Organic cotton is usually a better choice than conventional cotton, especially when it comes to reducing pesticide and fertilizer pollution. But like all materials, it still has an impact. The goal is not perfection. It is choosing materials and brands that are doing less harm, while also changing the way we consume clothing in the first place.

4. Synthetic Fabrics and Microplastics

Finally, some types of clothing continue to pollute water even after they’ve made it into your closet! Many synthetic clothing fabrics, like polyester and nylon, come from plastic. As these fabrics break down, they release “microfibers” into the natural environment. In the case of plastic-based fabrics like polyester and nylon, these small fibers that are dropped from clothing in use or when washed are actually microplastics, very small pieces of plastic that do not degrade over time.

Synthetic fabrics do not just create pollution during production. They can continue polluting water every time we wash them. When you wash your polyester clothing (such as athletic clothing), small pieces of the fabric enter the wash water, and eventually make their way into the ocean. Studies show that 35% of microplastics found in the ocean result from washing clothes made of synthetic material. These microplastics don’t just stay in one place, either, because water is an extremely efficient method of transport! Synthetic microfibers pollute freshwater, contaminate drinking water, and even make their way into Arctic sea ice. When people throw clothes away instead of recycling them, the fibers break down into microplastics in the landfill. Because microplastics don’t degrade, they instead make their way into water sources over time.

5. Fast Fashion and Overproduction

Fast fashion has made clothing feel disposable. Instead of producing fewer, better-quality garments that are worn for years, many brands now rely on constant new arrivals, cheap synthetic fabrics, and high-volume production. That means more fabric is dyed, more chemicals are used, more wastewater is created, and more clothing is eventually discarded.

The problem is not just one polyester shirt or one dyed dress. It is the scale of the system. When billions of garments are produced every year, even small amounts of chemical runoff, dye pollution, and microfiber shedding add up quickly.

This is why water pollution in fashion is not only a fabric issue. It is also an overproduction issue.

Fashion Water Pollution Statistics

35% of microplastics found in the ocean result from washing clothes made of synthetic material.

The fashion industry uses an estimated 79 trillion liters of water every year.

Producing one cotton shirt can require around 2700 liters of water.

Textile dyeing is estimated to contribute to around 20% of global industrial water pollution.

Which Fabrics Cause the Most Water Pollution?

Not all fabrics impact water in the same way. Some pollute waterways during the farming stage, some during the dyeing and finishing process, and others every time we wash them.

This is why it’s important to look beyond whether a fabric is “natural” or “synthetic” and ask a bigger question: how was this material grown, made, dyed, finished, and cared for after purchase?

Here are some of the fabrics most commonly connected to water pollution in the fashion industry.

1. Polyester

Polyester is one of the most widely used fabrics in the world, and it is also one of the biggest concerns when it comes to long-term water pollution.

Because polyester is made from petroleum, its impact begins with fossil fuel extraction and chemical-heavy production. But the issue does not stop once the clothing is made. Polyester also sheds tiny plastic fibers, known as microplastics or synthetic microfibers, when washed.

These microfibers can travel from our washing machines into wastewater systems, rivers, and oceans. Once they enter the environment, they are extremely difficult to remove and can be ingested by marine life.

This is one reason I try to avoid polyester whenever possible, especially for clothing that needs to be washed often.

2. Nylon

Nylon is another synthetic fabric made from fossil fuels. Like polyester, it can shed synthetic microfibers when washed, contributing to microplastic pollution in waterways.

It is commonly used in activewear, swimwear, tights, outerwear, and performance fabrics because it is stretchy, lightweight, and durable. But those same qualities come with environmental concerns.

Nylon production can be energy-intensive, and once nylon clothing sheds microfibers, those tiny plastic particles can persist in the environment for a very long time.

While nylon may be hard to avoid in certain categories like swimwear or technical gear, it is still a fabric worth limiting when possible.

3. Acrylic

Acrylic is often used as a cheaper alternative to wool, especially in sweaters, scarves, hats, and knitwear. It may feel soft and cozy at first, but it is another synthetic fiber made from fossil fuels.

Acrylic is especially concerning because it is known to shed a high amount of synthetic microfibers during washing. This makes it one of the fabrics I would be most cautious about, especially for sweaters and knits that can release fibers over time.

If you are shopping for colder-weather pieces, choosing wool, organic cotton, or other natural fiber knits can be a better option than acrylic when your budget allows.

4. Conventional Cotton

Cotton is a natural fiber, but that does not automatically make it low-impact.

Conventional cotton can be extremely water-intensive, especially when grown in hot or dry regions that rely heavily on irrigation. Large amounts of water may be pulled from rivers, lakes, aquifers, and groundwater stores to grow cotton crops.

There is also the issue of chemical runoff. Conventional cotton is often grown with synthetic pesticides, herbicides, and fertilizers. When rain or irrigation water moves through cotton fields, those chemicals can run off into nearby waterways and contribute to pollution.

So while cotton does not shed plastic microfibers like polyester or nylon, conventionally grown cotton can still have a serious impact on water use and water quality.

5. Viscose and Bamboo Viscose

Viscose, including bamboo viscose, is often marketed as a more natural or eco-friendly fabric because it starts with plant-based cellulose. But the final fabric is not as simple as “bamboo clothing” or “wood pulp clothing.”

Viscose is a semi-synthetic fabric, meaning it begins with a natural raw material but goes through a chemical-heavy process to become soft, wearable fabric. If this process is not done responsibly, it can involve toxic chemicals and wastewater pollution.

Bamboo viscose is especially tricky because it is often marketed as sustainable, soft, and natural, even though turning bamboo into viscose usually requires intensive chemical processing.

This does not mean every viscose fabric is equally bad. Some producers use better closed-loop systems and more responsible sourcing. But unless a brand is transparent about how the fabric is made, viscose and bamboo viscose deserve a closer look.

Better Fabric Options to Consider

If you are trying to reduce your clothing’s impact on water pollution, one of the best places to start is by choosing more natural, responsibly sourced fibers when possible.

Fabrics like organic cotton, linen, hemp, wool, and other natural fibers are often better choices because they do not shed plastic microfibers into waterways when washed. This is a big difference compared to synthetic fabrics like polyester, nylon, and acrylic.

Of course, natural fibers are not perfect. Organic cotton still requires water to grow. Linen and hemp still need land, processing, and dyeing. Wool depends heavily on how animals are raised and how the fiber is sourced. Every fabric has an impact somewhere.

But natural fibers avoid one of the biggest long-term water pollution issues connected to clothing: plastic microfiber shedding.

A more sustainable wardrobe is not about replacing everything you own overnight. It is about learning what your clothing is made from, choosing better when you can, washing less often, caring for pieces well, and keeping them in use for as long as possible.

When shopping, look for:

• Organic cotton instead of conventional cotton
• Linen and hemp, especially for warm-weather clothing
• Responsibly sourced wool for sweaters and coats
• Undyed or naturally dyed fabrics when available
• Certifications like GOTS, OEKO-TEX®, and bluesign®
• Brands that explain how their fabrics are grown, dyed, and finished

The goal is not to find a “perfect” fabric. It is to choose materials that create less harm, last longer in your wardrobe, and support a slower, more thoughtful way of getting dressed.

How Fashion Water Pollution Impacts People and the Planet

The most obvious damage the fashion industry’s water use creates is harm to the environment. The introduction of toxic chemicals into water sources harms wildlife and destroys sensitive marine and freshwater environments. Some chemicals may also contribute to ocean acidification, which has far-reaching impacts throughout the marine food chain. Water pollution from clothing production also harms human health. First, while not directly linked to water pollution, the chemicals used in textile manufacturing can have severe impacts on workers’ health. 

Additionally, chemical dumping into water supplies damages the health of nearby communities that depend on the water for resources, whether that’s drinking water or seafood. For example, shellfish often soak up toxic chemicals like AZO dyes from textile production, which can cause harm to people who eat them.  The microfibers released from fabrics can cause health issues as well. Microplastics in seafood or drinking water are especially harmful, as ingestion can cause a variety of health problems.

How to Reduce Fashion’s Water Pollution

Much of the change must come from the fashion industry itself. For example, manufacturers must invest in less water-intensive production methods, and find ways to reduce the amount of chemicals used in clothing production. For example, some companies are taking steps towards only using natural dyes, which have a much lower environmental impact. Many clothing companies also choose to follow guidelines from the Higg Index, a set of standards created by the Sustainable Apparel Coalition to help businesses ensure sustainable supply chains.

Some scientists are also working on solutions to clean chemicals from wastewater before it’s released into the environment. For example, one team of researchers believes that chitin, a biological chemical found in shells, can be used to filter chemicals out of the textile industry’s wastewater.

Increased regulation of the fashion industry’s wastewater habits is another step that will help reduce the amount of toxic chemicals in our waterways. While this has begun in some countries, more oversight is needed in many countries that produce large amounts of clothing, such as China.

Luckily, there are also a few things you can do to reduce the fashion world’s water use and pollution. For example, it’s important to buy new clothes only when you need them to reduce the amount of clothing (and waste) that is produced. Another great, sustainable option is to thrift clothes, rather than buying new. This also reduces the amount of new clothing that must be produced, and thus reduces the amount of water and pollution created in clothing production. Finally, consider recycling your clothes rather than just throwing them out. This will help reduce the amount of microplastics that make their way to the ocean from landfill. For more tips on making your closet more sustainable, check out our guide to sustainable fashion.

What Fashion Brands Can Do

Much of the change has to come from the fashion industry itself. Brands and manufacturers need to reduce the amount of water and chemicals used during production, invest in closed-loop or lower-water dyeing systems, and make sure wastewater is properly treated before it enters rivers or oceans.

Fashion brands can also reduce water pollution by:

• using safer dyes and lower-impact dyeing methods
• investing in wastewater treatment
• avoiding harmful finishing chemicals
• choosing organic and regenerative natural fibers when possible
• reducing synthetic fiber use
• designing clothing to last longer
• producing less overall
• being transparent about factory conditions and chemical management

Some brands may use tools or standards to measure their impact, but measurement alone is not enough. The most important step is reducing pollution at the source.

What Consumers Can Do

As consumers, we cannot fix fashion’s water pollution alone, but we can reduce our personal impact and support a better system.

A few helpful steps include:

• buying fewer new clothes
• wearing what you already own longer
• choosing secondhand when possible
• prioritizing natural fibers like organic cotton, linen, hemp, and wool
• avoiding unnecessary synthetics, especially polyester fleece and acrylic
• washing clothing less often
• washing synthetic clothing in cold water on gentle cycles
• using a microfiber-catching laundry bag or washing machine filter
• repairing, reselling, donating responsibly, or recycling clothing when possible

The goal is not perfection. It is shifting away from disposable fashion and toward clothing that is made, worn, and cared for more thoughtfully.

FAQs About Fashion Industry Water Pollution

Is fashion the biggest polluter of water?

The fashion industry is one of the major contributors to industrial water pollution, especially through textile dyeing, chemical finishing, and untreated wastewater. While it may not be the single biggest polluter in every region, clothing production has a significant impact on rivers, oceans, and freshwater systems around the world.

What part of fashion production pollutes water the most?

Textile dyeing and finishing are among the most polluting stages of fashion production. These processes use large amounts of water, synthetic dyes, salts, heavy metals, and chemical treatments. When wastewater is not properly treated, these substances can enter nearby rivers and waterways.

How does fast fashion affect water pollution?

Fast fashion increases water pollution by producing huge volumes of clothing quickly and cheaply. More production means more fabric dyeing, more chemical use, more wastewater, and more synthetic clothing that can shed microplastics in the wash. The overproduction model is a major reason fashion’s water impact is so large.

Do natural fabrics pollute water?

Natural fabrics can still have environmental impacts, especially if they are grown with heavy irrigation, pesticides, or chemical processing. Conventional cotton, for example, can be very water-intensive. However, natural fibers do not shed plastic microfibers like polyester, nylon, and acrylic do.

How can I reduce water pollution from my clothes?

The best ways to reduce clothing-related water pollution are to buy less, wear your clothes longer, choose secondhand, avoid unnecessary synthetic fabrics, wash clothing less often, and use a microfiber filter or washing bag when washing polyester or nylon. Choosing natural and certified fabrics can also help.

As someone who has been writing about sustainable fashion for over a decade, I’ve found that water pollution is one of the clearest examples of why “cheap” clothing often has hidden costs. The price tag may look low, but the real cost can show up in polluted rivers, unsafe working conditions, and clothing that is treated as disposable.

About the Author

Natalie Kay Costello is the founder of Sustainably Chic and has been writing about sustainable fashion for over a decade. Her work focuses on ethical brands, natural fabrics, and helping consumers navigate greenwashing in the fashion industry.