Mold vs. Mildew: A Minnesota Homeowner’s Guide

If you live in Minnesota, you already know how unpredictable the seasons can be—from frigid winters to muggy, storm-filled summers. And while we adapt to the changing weather, our homes face a quieter, sneakier challenge: mold and mildew. But how can you tell the difference between mold vs. mildew?

Whether it’s a damp bathroom ceiling or a musty smell coming from the basement, these pesky fungi love Minnesota’s humid climate. They show up on walls, ceilings, fabrics—basically anywhere moisture lingers. So it’s best to know the difference between mold and mildew, and when you can take matters into your own hands versus calling in the pros.

At a glance, mold and mildew might look similar—discoloration, weird smells, general “ick” factor. But they’re actually quite different in how they grow, how they look, and what kind of threat they pose to your home and health.

Mildew:

• Think of mildew as mold’s less dangerous cousin.
• Usually shows up as white, gray, or yellow patches
• Has a powdery or fuzzy texture
• Likes damp surfaces like shower curtains, laundry rooms, or window sills
• Easy to clean and wipe away

Mold:

• Mold means business.
• Comes in black, green, or dark brown shades
• Has a fuzzy, slimy, or raised appearance
• Grows deeper into materials like drywall, wood, and insulation
• Often brings a strong, musty odor
• Can trigger serious health issues, especially for folks with asthma, allergies, or weakened immune systems

No surprise here—moisture is the main culprit. And in a state like Minnesota, where we swing between snowmelt, rainstorms, and humid indoor air, there’s no shortage of opportunities for water to sneak in.

Here are the most common reasons mold or mildew might take hold in your home:

• Leaks, whether from a pipe, roof, or appliance
• Flooding from heavy rain or snowmelt
• Poor ventilation in rooms like kitchens, bathrooms, or basements
• High humidity levels (anything over 50% is risky)
• Condensation forming on windows or walls
• Damp carpets, furniture, or fabric that never quite dry out

Knowing where to look is half the battle. Mold and mildew tend to settle into different types of spaces, so keep an eye out in these hot spots:

Mildew’s Favorite Hiding Spots:

• Bathroom tiles and grout
• Around windows
• Shower curtains
• Laundry room corners
• Damp fabrics (like forgotten gym bags)

Mold’s More Serious Hideouts:

• Behind walls or wallpaper
• Under sinks or behind toilets
• In basements and crawl spaces
• Inside HVAC vents and ductwork
• Under carpeting
• Around leaky roofs or attics

Mold prevention is all about moisture control and routine maintenance. Here’s what you can do:

• Use dehumidifiers in damp rooms (especially basements and bathrooms)
• Fix leaks ASAP, whether it’s a pipe under the sink or a drip from the ceiling
• Ensure good airflow with fans and open windows
• Install and use exhaust fans in bathrooms and kitchens
• Clean up spills or standing water right away
• Check for condensation and add insulation if needed
• Use mold-resistant paint in high-risk areas

A little prevention goes a long way when it comes to avoiding costly repairs and health issues.

It’s easy to shrug off a small stain or a weird smell. But for mold and mildew, ignoring the signs can lead to bigger headaches down the road—from damaged drywall to chronic allergies or worse.

If your Minnesota home has recently experienced water damage or you’ve spotted signs of mold, don’t take chances. Call Restorations by Highmark for expert mold inspection and removal. We’ll help you get your home back to clean, dry, and healthy—and keep it that way.