Why Does My Coffee Taste Metallic? 6 Common Reasons

crazy by Editorial Staff | Posted on April 3rd, 2023

You sit down to enjoy your morning java, ready to relish that bold and aromatic flavor. But wait—something’s off.


Your taste buds are hit with an unexpected metallic taste. So, why does your coffee taste metallic? Don’t worry, we’ve got your back.

coffee maker

Let’s dive in and figure out how to get your coffee tasting perfect again.

1. Low-Quality Coffee Beans

Your coffee’s flavor starts with the beans. If you’re experiencing a metallic taste, low-quality or stale coffee beans might be the culprit. For the best cup of coffee, go for high-quality, freshly roasted beans. How do you spot fresh beans? Look for these indicators:

  • A glossy appearance—signs of flavorful acids and oils.
  • An oily residue on your hands or inside the bag.

Keep in mind that decaffeinated beans and light roasts may have a duller appearance, and that’s perfectly normal!

Additionally, consider the following when buying coffee beans:

  • Purchase from reputable roasters who provide roast dates on the packaging.
  • Opt for whole beans rather than pre-ground coffee for maximum freshness.
  • Store your beans in a cool, dark place in an airtight container.

2. The Art of Extraction

Grinding your coffee beans is a crucial step in the brewing process. The goal is to achieve the right extraction—a balance between over-extraction and under-extraction.

Grind TypeResultFlavor Profile
FineOver-extractionBitter, metallic
CoarseUnder-extractionWeak, sour

To optimize your coffee’s flavor, experiment with your grinder’s settings to find the sweet spot between fine and coarse.

3. Temperature Matters

Did you know that water temperature plays a huge role in brewing coffee? The ideal temperature is around 205 degrees Fahrenheit (96 degrees Celsius). If the water is too hot, it may scorch the coffee grounds and impair the flavor. If it’s too cold, your coffee may taste flat and underwhelming.

To ensure a consistent temperature:

  • Use a kettle with a temperature control setting.
  • Allow boiling water to cool for about 30 seconds before brewing.

4. The Roasting Process

Roasting coffee beans is both an art and a science. If you’re roasting your own beans at home, kudos to you! However, keep in mind that a poorly executed roast can result in a metallic taste. Make sure to:

  • Source high-quality green beans.
  • Time the roasting process correctly.
  • Store the roasted beans properly.
  • Experiment with different roast levels to find your preference.

5. The Role of Water Quality

Coffee is mostly water, so the quality of your water is essential. Tap water or unfiltered water may contain minerals like manganese and calcium, which can impart a metallic or acidic taste to your coffee.

For the best results:

  • Use filtered water.
  • Consider investing in a water filter pitcher or faucet attachment.
  • Avoid distilled or softened water, as they lack essential minerals for coffee flavor.

6. Keep Your Coffee Maker Clean

Last but not least, keep your coffee maker squeaky clean! Over time, coffee makers can accumulate mineral deposits, oils, and even mold and bacteria. This buildup can affect the flavor of your coffee and cause a metallic taste.

To clean your coffee maker:

Run a mixture of water and white vinegar through the machine (1:1 ratio).

  • Run two cycles of plain water to rinse.
  • Clean the exterior surfaces, coffee pot, and brewing basket with a gentle scrub brush or sponge.
  • Pay attention to any removable parts, such as filter baskets or carafes, and clean them thoroughly.

To keep your coffee maker in top condition, follow this cleaning schedule:

  • Daily: Rinse removable parts after each use.
  • Weekly: Wipe down the exterior and clean the carafe.
  • Monthly: Perform a thorough cleaning with vinegar and water.

There you have it—six common reasons why your coffee may taste metallic and how to address them. With these tips and added insights in mind, you’re on your way to brewing the perfect cup of coffee, minus the metallic taste!

Disclaimer: This post contains affiliate links, which means I may receive a small commission, at no extra cost to you, if you make a purchase using these links. Remember to support us by purchasing through the Amazon/Walmart/Impact Radius links provided. Last update on 2024-03-03 / Affiliate links / Images from Amazon Product Advertising API

Disclosure: No compensation or free products were received in exchange for writing this review.

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Editorial Staff

The editorial staff at Crazy Coffee Crave is a team of coffee enthusiasts & Baristas who enjoy the one thing we all think about as soon as we get up in the morning. Trusted by thousands of readers worldwide.