Filtering Microplastics from Water: What You Need to Know

Microplastics have become one of the most talked-about emerging water concerns. These tiny plastic particles are now found across the environment, including oceans, rivers, soil, air, bottled water, and some drinking-water sources.

For homeowners, the question is simple: if microplastics may be in water, what can you do about it? The answer starts with understanding what they are, how they get into water, and which filtration options may help reduce them.

What are microplastics?

Microplastics are very small plastic particles. They are often described as plastic pieces smaller than 5 millimeters, although researchers also study even smaller nanoplastics.

Microplastics usually come from two main sources:

• Primary microplastics: Tiny plastic particles made small on purpose, such as some industrial materials or older microbead-style products.
• Secondary microplastics: Small particles created when larger plastic items break down over time, such as bottles, bags, packaging, textiles, and other plastic waste.

Because plastic breaks down into smaller pieces instead of simply disappearing, microplastics can move through the environment in ways that are hard to control.

How do microplastics get into water?

Microplastics can reach water in many ways. Plastic litter can break down in rivers, lakes, and oceans. Synthetic clothing can shed tiny fibers during washing. Stormwater runoff can carry plastic debris from streets, yards, and developed areas into waterways.

They can also move through wastewater systems, industrial discharge, and surface runoff. Once they enter the environment, their small size makes them difficult to fully track and remove.

Are microplastics in drinking water harmful?

This is still an active area of research. Scientists are studying how much microplastic people may be exposed to, how particles behave in the body, and whether the chemicals attached to or released from plastics create additional risks.

Because the science is still developing, it is better to avoid overstating the answer. What we can say is that microplastics are an emerging contaminant of concern, and many homeowners would rather reduce exposure where practical.

Can filtration help reduce microplastics?

Yes, some filtration technologies may help reduce microplastics, especially when they are designed to remove very small particles. The right option depends on particle size, system design, filter rating, and the water itself.

Common options discussed for microplastic reduction include reverse osmosis, ultrafiltration, and certain high-quality filtration media. Not every standard filter is designed for this job, so it is important to look at the system details rather than assuming all filters perform the same way.

Reverse osmosis and microplastics

Reverse osmosis is often used for drinking water because it pushes water through a very fine membrane. This can help reduce many small particles and dissolved substances at a dedicated faucet.

If your main concern is drinking water at the kitchen sink, an under-sink reverse osmosis system may be a good fit. Freedom Water Systems offers the Hydro-Pure Tankless Reverse Osmosis Drinking Water System for point-of-use drinking-water filtration.

Whole-home filtration and microplastics

A whole-home filtration system treats water as it enters the house. This can be helpful when homeowners want broader water-quality support beyond one drinking-water faucet.

Whole-home filtration may make sense if you are also concerned about sediment, chlorine, taste and odor, heavy metals, PFAS, scale, or other water-quality issues throughout the house. If your goal is highly targeted drinking-water filtration, reverse osmosis may still be a strong add-on.

How to reduce microplastic exposure at home

Filtration is only one part of the picture. You can also reduce plastic exposure by using reusable bottles, avoiding unnecessary single-use plastics, washing synthetic fabrics carefully, and keeping plastic waste out of storm drains, yards, and waterways.

These steps will not remove every source of microplastics, but they do help reduce the amount of plastic entering the environment in the first place.

Start with your water goals

If microplastics are one of your concerns, the best next step is to think about your overall water goals. Are you mainly focused on drinking water? Do you want treatment throughout the whole home? Are there other concerns, such as chlorine, PFAS, lead, sediment, or hard water?

If you are not sure where to begin, start with our Water Test Kit. You can also review our performance data or schedule a consultation to talk through the best option for your home.

Frequently Asked Questions

What are microplastics?

Microplastics are tiny plastic particles, often described as smaller than 5 millimeters, that come from manufactured particles or larger plastic items breaking down over time.

How do microplastics get into water?

Microplastics can enter water through plastic waste, stormwater runoff, wastewater, synthetic fabric fibers, industrial activity, and the breakdown of larger plastic items.

Are microplastics harmful to human health?

Research is still developing. Scientists are studying possible health effects, exposure levels, and how microplastics and related chemicals may behave in the body.

Can reverse osmosis reduce microplastics?

Reverse osmosis can help reduce many small particles and dissolved substances at a dedicated drinking-water faucet, depending on the system design and source water.

Is whole-home filtration or reverse osmosis better for microplastics?

Reverse osmosis is often a strong option for dedicated drinking-water filtration, while whole-home filtration supports broader water quality throughout the house. Some homeowners choose both.

What is the best first step if I am concerned about microplastics in water?

Start by identifying your water source and goals, then compare filtration options designed for the type of protection you want at the tap or throughout the whole home.

Sources

• U.S. Environmental Protection Agency: Microplastics Research
• World Health Organization: Microplastics in Drinking-water