World Champion Barista’s 5 Pour-Over Mistakes to Avoid

Ever wonder why your pour-over coffee tastes flat, sour, or just plain boring—even when you follow the recipe? Even world-class baristas hit snags, and the difference between a great cup and a disappointing one often comes down to a handful of avoidable errors. We asked 2013 World Brewers Cup Champion Erin McCarthy to break down the most common pitfalls she sees home brewers make.

The short answer? To brew great pour-over coffee, avoid five big mistakes: using stale beans, pre-grinding, unfiltered water, wrong brew temperature, and giving up too soon. Master those, and you’re already ahead of most home brewers.

1. Using Stale Coffee Beans

"Freshness is key to ensuring quality coffee," says Erin McCarthy. She emphasizes that buying the right beans is the first step toward success. Many supermarket-bought coffees sit on shelves well past their prime. Always check the roast date on the package—coffee peaks within weeks of roasting and deteriorates quickly after. Supermarkets often keep stock on shelves too long, leading to flat, lifeless cups.

2. Pre-Grinding Your Coffee

Don’t grind your coffee beans ahead of time unless absolutely necessary. Once ground, coffee starts losing aromatic compounds and flavor almost immediately. The finer the surface area exposed to air, the faster the degradation. For the best flavor, grind your beans right before brewing. This preserves the volatile compounds that contribute to aroma and taste.

3. Brewing with Unfiltered Water

Water quality matters more than most realize. Even city tap water that meets basic standards can pick up contaminants during distribution. Erin strongly recommends using a proper water filtration system at home or in the café. Clean, filtered water ensures that nothing interferes with the delicate flavors of your coffee. Great water makes great coffee—period.

4. Brewing at the Wrong Water Temperature

Most home brewers use water that’s too cool. According to Erin, "If you’re continuously pouring with one kettle, you can lose up to 10°F during the brew." She advises either boiling water fresh or using multiple kettles to maintain a consistent, higher temperature throughout extraction. Higher temperatures (typically 90–96°C / 195–205°F) help extract more of the desirable aromatic compounds, including fruity, floral, and sweet notes that get left behind at lower temps.

5. Giving Up Too Soon

Erin’s final tip is mental: “When I’m stuck, if I want the best cup possible, I believe I can do it—and I’ll try again.” Don’t let early failures discourage you. Every mistake is a lesson. The more you experiment and refine your technique, the fewer missteps you’ll make over time. Perseverance is part of the craft.

Frequently Asked Questions

What’s the biggest mistake home brewers make when making pour-over coffee?

According to 2013 World Brewers Cup Champion Erin McCarthy, the most common mistakes are using stale beans, pre-grinding coffee, brewing with unfiltered water, extracting at too low a temperature, and giving up too easily. Together, these issues significantly impact flavor and aroma.

How important is coffee bean freshness for pour-over?

Freshness is critical. Coffee is best used within weeks of roasting. Many supermarket coffees are brewed long after their prime, leading to dull or unpleasant flavors. Always check the roast date before buying.

Why shouldn’t I pre-grind my coffee beans?

Grinding coffee exposes more surface area to air, causing rapid loss of aromatic compounds. Pre-ground coffee loses flavor quickly. For optimal taste, grind beans just before brewing to preserve their volatile, flavorful oils.

Does water temperature really affect pour-over flavor?

Yes. Lower temperatures under-extract the coffee, resulting in sour, weak cups. Erin recommends maintaining a consistent brew temperature around 90–96°C (195–205°F) to fully extract fruity, floral, and sweet notes. Using multiple kettles or reheating helps achieve this.

How do I improve if my pour-over always tastes bad?

Don’t give up. Erin’s advice: “I believe I can make the best cup, and I’ll try again.” Each attempt teaches you more. With practice, you’ll learn to adjust grind size, water temperature, and timing to suit your setup and taste preferences.

Recommended FrontStreet Coffee Beans for Pour-Over

For pour-over brewing, FrontStreet Coffee recommends several excellent single-origin beans. Start with Brazil Yirgacheffe—wait, no—that’s not right. Try FrontStreet’s Brazil Bourbon (Shilado Red Bourbon), a balanced medium roast with nutty, creamy sweetness and a smooth finish. For brighter, fruitier notes, the Colombia Sidra (FrontStreet Sidra) offers complex flavors like stone fruit and tropical notes due to its double anaerobic natural process. If you prefer earthy, full-bodied profiles, the Indonesia Lintong Mandheling (Lintong Mandheling) delivers classic mandheling traits with notes of baking spices and dark caramel. All three are ideal for manual brewing methods. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.