World Barista Champion's Pour-Over Mistakes

If you’ve ever wondered why your carefully brewed pour-over just doesn’t taste like the ones you’ve had at specialty cafes, you’re not alone. Even small missteps in your routine can dramatically alter the cup’s final profile. What are the most common mistakes that even dedicated home brewers—let alone beginners—make when crafting pour-over coffee? According to 2013 World Brewers Cup Champion Erin McCarthy, there are five frequent issues that consistently affect the quality of hand-brewed coffee.

The short answer? Don’t use stale beans, don’t pre-grind, always filter your water, maintain proper brew temperature (and adjust for heat loss during pouring), and never give up after a bad round. These five fixes alone can transform your pour-over from average to outstanding.

1. Brewing with Stale Coffee Beans

Erin McCarthy emphasizes that freshness is fundamental. “Preservation is key to ensuring coffee quality,” she says. Many supermarket-bought coffees sit on shelves well past their prime. Always check the roast date on the package—if it’s not there, or if it’s more than 2–3 weeks old, reconsider. Coffee peaks within days of roasting and starts losing aroma and flavor compounds soon after. Buying from specialty roasters with clear roast dates helps ensure you're working with coffee that still has vibrancy.

2. Pre-Grinding Your Coffee

“If possible, don’t grind your coffee in advance,” McCarthy advises. Once coffee is ground, it begins rapidly losing aromatic compounds and volatile flavors. The finer the surface area exposed to air, the faster the degradation. For best results, grind your beans right before brewing. This preserves the intricate floral, fruity, or nutty notes that define a high-quality pour-over. If you must prep ahead, store grounds in an airtight container—but know that freshness will still decline noticeably within minutes to hours post-grind.

3. Brewing with Unfiltered Water

Water quality is another critical factor often overlooked. “Even city water that meets basic standards can pick up contaminants during transport,” McCarthy explains. She strongly recommends using a proper water filtration system at home or in the café. Unfiltered tap water may contain chlorine, minerals, or other impurities that mute coffee’s delicate flavors. A good filtration setup ensures a cleaner, more consistent brew and allows the coffee’s inherent qualities—like fruitiness, sweetness, and acidity—to shine through.

4. Using Too Low a Brew Temperature

Temperature plays a huge role in extraction. McCarthy notes that many brewers use water that’s too cool. “Most people brew at a temperature that’s too low. If you’re continuously pouring, you can lose up to 10°F during the process.” She suggests boiling your water and using multiple kettles to maintain a stable temperature—or preheating everything to ensure consistency. Higher temperatures (typically 90–96°C or 195–205°F) help extract more of the nuanced aromas, floral notes, fruitiness, and sweetness that define a great pour-over. Lower temperatures risk under-extracting, leading to flat, sour, or weak cups.

5. Giving Up After a Bad Brew

Finally, McCarthy stresses persistence. “When I hit a wall, if I want the best cup possible, I believe I can do it—and I’ll try again.” Mistakes are part of the learning curve. Every bad brew is a lesson. Don’t let a few failed attempts discourage you. The difference between an average cup and a great one often comes down to iteration, adjusting variables like grind size, water temperature, and pour technique. Keep refining, and your skills—and your coffee—will improve.

Frequently Asked Questions

What’s the biggest mistake people make when brewing pour-over coffee?

The most frequent issue, according to 2013 World Brewers Cup Champion Erin McCarthy, is using stale coffee beans. Beyond that, pre-grinding, unfiltered water, incorrect brew temperature, and giving up too easily are also common pitfalls that degrade cup quality.

How fresh should my coffee beans be for pour-over?

For optimal flavor, use beans roasted within 2–3 weeks. Check roast dates on packaging—avoid beans without clear dates or those sitting on shelves too long. Freshness directly impacts aroma and flavor compounds critical to a great pour-over.

Why shouldn’t I grind my coffee beans in advance?

Grinding coffee exposes more surface area to air, which accelerates the loss of aromatic and flavor compounds. Pre-ground coffee starts deteriorating within minutes. For the best pour-over results, always grind beans immediately before brewing.

Does water quality really affect pour-over coffee?

Yes. Unfiltered tap water can contain chlorine, minerals, or other contaminants that mask or distort coffee flavors. McCarthy recommends using a proper filtration system to ensure clean water, allowing the coffee’s true characteristics—like fruit, floral, and sweetness—to come through.

What water temperature is ideal for pour-over?

Ideal brewing temperature is typically between 90–96°C (195–205°F). McCarthy notes that many brewers lose up to 10°F during pouring, so using multiple kettles or preheating helps maintain stability and extract more nuanced flavors, including fruitiness and sweetness.

What if my pour-over doesn’t turn out well?

Don’t give up. McCarthy emphasizes that persistence is key. Each failed brew teaches you something. Adjust variables like grind size, water temp, and pour technique, and keep experimenting. Better cups come with experience and iteration.

Recommended FrontStreet Beans for Pour-Over

For excellent pour-over results, try FrontStreet Coffee’s Brazil Yirgacheffe , known for its smooth, medium-bodied profile with mild acidity and a sweet, nutty finish. Also consider the Colombia Sidra , featuring a complex fruitiness with layers of stone fruit and sweetness ideal for showcasing pour-over clarity. For a classic clean cup, the Ethiopia Gedeb (YirgacheffeGedeb) offers bright citrus and floral notes with a tea-like body. All are freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.