Aspergillus & Penicillium: What You Need to Know About These Common Household Molds

When people think of mold, they often imagine black mold as the biggest concern. But two of the most common — and often underestimated — types of mold are Aspergillus and Penicillium. These molds can appear in homes, offices, and other indoor spaces, and while they may seem harmless at first glance, they can create hidden problems for your health and your property.

Let’s break them down in simple terms so you can understand why testing is so important.

What Is Aspergillus and Penicillium?

Both Aspergillus and Penicillium are fungi found all around us — in soil, dust, and even in the air we breathe. They belong to a group of molds that thrive indoors, especially in damp or water-damaged environments.

• Aspergillus has hundreds of species, some of which are used in food production (like soy sauce), but others can cause allergic reactions or infections.

• Penicillium is best known as the mold that gave us penicillin, the life-saving antibiotic. However, in your home, it’s not so friendly — it often indicates water damage and can trigger allergic responses.

  
  

Behavior of the Mold

Both Aspergillus and Penicillium grow quickly in areas with high humidity, leaks, or poor ventilation. They don’t just stay put — they release microscopic spores into the air, which can spread throughout your home without you even noticing.

Structural Materials They Feed On

These molds aren’t picky eaters. They commonly grow on:

• Wood

• Drywall

• Wallpaper

• Carpet and padding

• Insulation

• Upholstery and fabrics

• Even stored food

If there’s moisture, there’s a chance these molds will find a way to grow.

Allergic Potential & Health Concerns

Exposure to Aspergillus and Penicillium can affect people differently, depending on their health and sensitivity. Common issues include:

• Sneezing, coughing, and runny nose (like seasonal allergies)

• Asthma flare-ups

• Eye and skin irritation

• In rare cases, certain species of Aspergillus can cause more serious infections, especially in people with weakened immune systems

  
  

This is why it’s important not to ignore suspicious spots or musty odors in your home.

Mode of Dissemination (How It Spreads)

Both molds reproduce through airborne spores. Once released, these spores can travel through your HVAC system, land on new surfaces, and start growing wherever moisture allows. That means a small hidden patch can quickly become a whole-house concern if left untreated.

Why Testing Matters

Because Aspergillus and Penicillium look very similar to the naked eye (often appearing green, blue, or white), it takes professional testing to determine exactly what type of mold is present and how severe the contamination may be.

Call Lighthouse Environmental for Help

If you suspect mold in your home, don’t wait until symptoms worsen or damage spreads. At Lighthouse Environmental, our licensed assessors provide comprehensive mold inspections, testing, and reporting so you know exactly what you’re dealing with and how to address it.

Your family’s health and your home’s safety are too important to leave to chance.

📞 Call us today at 845-228-0076 to schedule your mold testing and get peace of mind.