If you're serious about your coffee, then you know that a truly great cup isn’t just about the beans—it’s also about the process and the equipment. Many coffee lovers are unaware that their daily cup may come with unwanted microplastics, mold contamination, heavy metals or poor-quality (burnt) beans. In this guide, we’ll cover how to brew the perfect cup of coffee, plastic-free!

How To Make The Perfect (Non Toxic) Cup Of Coffee

All of the tools we used (and additional recommended alternatives) are linked in our Non Toxic Kitchen Shopping Guide, under "Coffee & Tea Makers". You may also find this article on espresso machines helpful, where we reached out to over 18 brands to find out about the materials they use in their espresso machines.

Choosing the Right Brewing Machine

Your coffee maker is one of the most critical components of your morning ritual. However, many machines are made with plastic parts that come into contact with hot water, leaching microplastics and harmful chemicals into your coffee.

Single-serve pod machines and brewers with plastic filters are among the worst choices. When exposed to heat, they release thousands of microplastics into your cup. Research published in Nature Medicine found significant amounts of microplastics in human brain tissues, with higher concentrations observed in individuals with dementia. The study suggests that these particles can cross the blood-brain barrier, potentially leading to neurological health issues like dementia. Plastic is also linked to hormone disruption.

The truth is, science still does not fully grasp the harm caused by plastic waste in our environment. Removing plastic wherever you can, especially from your daily habits, helps.

You do have several plastic-free brewers to choose from, such as:

• French Presses (Glass or Stainless Steel) – A classic option with no plastic components, ensuring a pure taste.
• Pour-Overs (Glass) – Devices like the Chemex or ceramic drippers keep plastic out of the equation and allow full control over your brew.
• Percolators (Stainless Steel Only) – A great old-school method that avoids plastic while still producing a rich, semi-strong coffee from your stovetop.
• Cold Brew Sets - for iced coffee drinkers.

But let's be real. None of these are going to give you *espresso*, coffeehouse quality drinks. For this you need an espresso machine with adequate pressure.

Do Plastic-Free Espresso Machines Exist?

We have searched high and low for a completely plastic-free espresso machine, and we've only found one that exists: The Flair Espresso system. These are manual espresso machines, not automatic like the ones you may be accustomed to. They provide approximately 9-bar pressure, which is within Espresso level, and they have a few options that start at $99.

Is Flair really the only plastic-free espresso machine we've found?

Yes. Now would be a good time to visit our Espresso research project. We reached out to over 18 espresso machine brands (both residential and commercial) to find the most non toxic option.

We questioned them on more than just plastic, but PFAS and aluminum too. Sadly, there are very few viable options, but we encourage you to read the article to make the best informed choice for you.

Avoiding Plastic

If you have chosen a different machine, one easy swap I recommend to minimize some plastic is to look at your portafilter, where your hot coffee exits. Even if your espresso machine contains plastic in the portafilter, you can often seek out compatible portafilters that will fit your machine sans plastic. Take note of the size (typically between 51 and 58mm) and find one that will work for you.

It is much harder to swap out other plastic parts in your espresso machine, unless you are an engineer. 

Check For PFAS

You will also want to check the espresso machine for PFAS (per- and polyfluoroalkyl substances). PFAS may be present in the water reservoir, piping, tubing, and internal coatings. These "forever chemicals" are commonly used for their nonstick, heat-resistant, and water-repellent properties, but they do not break down easily and can leach into beverages over time.

Given the high temperatures and pressure involved in espresso brewing, PFAS-containing materials may degrade and contaminate the water, leading to potential long-term exposure. Studies have linked PFAS to hormone disruption, immune suppression, and an increased risk of certain cancers, making their presence in food-contact appliances particularly concerning. 

Check For Aluminum

Aluminum exposure is a growing concern due to its potential neurotoxic effects, with research suggesting links to cognitive decline, neurodegenerative diseases, and immune dysfunction.

While small amounts of aluminum are naturally present in food and water, excessive exposure from cookware, food packaging, and food/beverage preparation can lead to accumulation in the body, particularly in the brain, bones, and kidneys.

The risk is higher when aluminum comes into contact with hot water and acidic substances, as these conditions increase leaching. Aluminum is a reactive metal. You can find a few studies in the NIH database of aluminum from aluminum foil/pans leaching into foods when prepared at hot temperatures (source 1, source 2).

Espresso machines present a higher risk of aluminum exposure because they use high temperatures and pressure, which accelerate aluminum leaching, especially when brewing acidic coffee. Avoiding it is ideal.

Other Essential Coffee Tools

Now that you hopefully have the right brewing device, let's move on to other helpful tools. Remember, the goal is coffeehouse quality espresso beverages like lattes and cappuccinos. These additional tools can elevate your coffee experience.

• Milk Warmer and Frother - A good-quality milk warmer and frother is essential for lattes, cappuccinos, and macchiatos. Look for one made from stainless steel or glass to avoid plastic contamination. If the lid is plastic, skip it! You don't need it. You can also heat your milk in a stainless steel pot on your stovetop. My Maestri milk frother is my most used tool in the kitchen!
• Coffee Grinder - Freshly ground coffee makes a world of difference in flavor and aroma. Pre-ground coffee oxidizes quickly, losing its freshness and depth. Grinding your coffee just before brewing preserves the oils and flavors essential for espresso.
• Tamper Tool (optional) - It helps compress the coffee grounds evenly into the portafilter, ensuring proper water resistance during extraction. This results in a richer, more balanced espresso shot with optimal crema.
• Glass Espresso Cups - glass is my preferred choice because you can witness that delicious crema. Glass is also a great non-toxic choice material!

Our top picks for these additional coffee tools are linked in our Non Toxic Kitchen Shopping Guide, under "Coffee & Tea Makers"

Coffee Quality: What to Look for in a Brand

Now that you have your tools, let's discuss the coffee. Not all coffee is created equal. Many mass-produced brands contain mold, pesticides, and even mycotoxins due to poor growing and processing methods. Here’s what to look for in high-quality coffee:

• Organic and Specialty Grade – Organic certification ensures the beans are grown without synthetic pesticides or fertilizers, and specialty-grade coffee ensures a higher quality.
• Mycotoxin-Free or Third-Party Tested – Some brands specifically test their beans for mold and mycotoxins to ensure purity. Pro-tip: high-altitude coffees tend to contain a lower risk of mold.
• Single Source – Coffee blends can be a bit of a mystery and less traceable.
• Fair Trade or Direct Trade – Ethically sourced coffee ensures farmers are paid fairly and reduces exposure to harmful farming practices.
• The Roast – Coffee roasts range from light to dark, with light roasts preserving the bean's original flavors and higher acidity, medium roasts offering a balanced flavor with caramelized sweetness, and dark roasts delivering bold, smoky notes with less acidity. Dark roast is sometimes used to mask the taste of low-quality or defective beans, as the intense roasting process can obscure flaws. Choose a high quality brand.

If you're looking for a clean, high-quality coffee that prioritizes both health and taste, Purity Coffee is our top pick. Their coffee is made from USDA Organic, specialty-grade Arabica beans, hand-picked and third-party tested for mold, mycotoxins, and heavy metals—something most brands don’t disclose.

They’re so transparent that they publish their lab results on their website and update them regularly. When sourcing coffee brands for the shop, I often use them as the gold standard for quality and accountability and ask other brands to do the same.

For Decaf Drinkers

The Swiss Water Method is a chemical-free, non-toxic process used to decaffeinate coffee while preserving its natural flavors. Unlike conventional decaffeination methods that rely on solvents like methylene chloride or ethyl acetate, the Swiss Water Process uses only pure water, temperature, and time to gently remove caffeine. Purity Coffee's decaf is made using the swiss water method.

Unfortunately, most decaf coffee in your supermarket uses the conventional method, so make sure you look for mentions of "Swiss Water Method" on your coffee beans.

How does it work? The process begins by soaking green coffee beans in hot water, allowing the caffeine and flavor compounds to dissolve. The water is then passed through a carbon filter that traps only the caffeine molecules, leaving behind the coffee’s natural flavors. This caffeine-free water, now rich with flavor compounds, is then used to soak a fresh batch of beans, ensuring that they retain their original taste without the caffeine.

Because no harsh chemicals are used, the Swiss Water Process is the cleanest, safest choice for decaf coffee, making it ideal for those avoiding synthetic solvents and potential chemical residues.

Unlike conventional coffees that may contain pesticides or hidden contaminants, Purity Coffee is roasted to maximize antioxidants, supporting overall wellness while delivering a smooth, rich flavor with notes of roasted nuts, dark chocolate, and juicy apple-like high notes.

It’s also Smithsonian Bird Friendly and Rainforest Alliance Certified, making it an ethical and environmentally conscious choice. For a truly clean, delicious, and toxin-free coffee experience, Purity Coffee is the brand we trust.

Whole Bean vs. Pre-Ground

While convenient, some pre-ground coffee oxidizes faster, losing its flavor and freshness. Worse, it has a higher chance of mold contamination due to prolonged exposure to air and moisture.

If you're buying ground from a good brand like Purity Coffee, then the risk is lower, but if you can opt for whole bean, I believe you will have a better tasting experience.

Choosing whole bean coffee means you can control more of the process at home. Invest in a good grinder to grind your beans fresh each morning. We promise you it will taste better!

Water Quality

Water makes up 98% of your coffee, so don’t overlook its quality. Use filtered water to avoid chlorine, heavy metals and other contaminants from tap water. Check out our article on how to shop for the best water filter.

Putting It All Together

Recommended steps for a basic latte:

1. Turn on your espresso machine (most require pre-heating).
2. While it is heating, pour your milk into your milk warmer and frother.
3. Fill your espresso machine's water tank with clean, filtered water.
4. Pour your whole beans into your coffee grinder and select "fine" for the grind. You'll need a fine grind for espresso.
5. Fill your portafilter with the coffee grounds (pay attention to the serving size of your portafilter, you will need to select the same size on your espresso machine). Most espresso machines have 2 sizes (1 cup and 2 cup).
6. Brew the espresso into your cup.
7. Add sugar (optional). We prefer organic cane sugar. For an even distribution of your sugar, you can use a handheld frother to combine both.
8. Top off with warm milk and froth.
9. Enjoy!

Making the perfect cup of coffee isn’t just about taste—it’s about health, quality, and using the right tools. By choosing the right brewing method, selecting high-quality coffee, grinding fresh, and using toxin-free accessories, you can enjoy a safer, richer, and more flavorful coffee experience every morning.

Move over Starbucks, we have better coffee at home! You can buy Purity Coffee here.