As spring greets Texas, rains become more prevalent, increasing humidity. This can lead to musty smells in bathrooms or strange discoloration on wooden cabinets. Could this be simple mildew or the sign of a more serious mold problem? Discover how to tell the difference between mold and mildew in Texas properties to protect your family’s health and safeguard your home.

How to Know Whether You Have Mold or Mildew

1. Use Visual Cues

Mildew is surface-level. It looks powdery, like a surface dusted with flour. Mildew is usually gray, white, or yellowish and often found on shower curtains, windowsills, fabrics, or other areas where condensation gathers.

On the other hand, mold has a fuzzy, velvety, or slimy texture. Its colors are more varied and intense than mildew — deep greens, blues, reds and black. It spreads through spores 2-100 microns in diameter, which float into the air or burrow into the material. You’ll know it’s mold because it’s raised above the surface and forms patches. Mold or mildew in the bathroom often forms along grout lines.

For a quick mold vs. mildew test, add a drop of household bleach into the infected area. Make sure you’re using bleach in a well-ventilated area. If the spot lightens or disappears after a while, you are likely dealing with mildew. If the spot remains dark, that’s a strong indicator of mold. 

2. Consider the Texture and Smell 

You can easily wipe away mildew on walls and surfaces. It smells musty, like damp laundry or a wet basement. On the other hand, mold is much stronger and more pungent, typically smelling earthy. Its texture is fuzzy or slimy because it has already established a colony on the material. Remember never to touch mold or a mold-like substance.

3. Observe the Growth Patterns

Mildew grows on the surface of materials, spreading outward in a flat pattern. Since it doesn’t embed itself deep into a surface, it often looks like a superficial, dusty patch that is slowly expanding. You will typically see this flat growth on damp surfaces, like shower walls, windowsills or even on plants.

Mold, on the other hand, is much more invasive. It grows both outward and inward by embedding roots deep into organic materials such as wood, drywall, and grout. This results in a more three-dimensional growth pattern that can appear as irregular, fuzzy patches or distinct circular spots. This penetrative growth is what causes the underlying structural damage associated with a mold problem.

Can Mildew Turn into Mold? 

No, mildew cannot turn into mold, as they are different kinds of fungi. However, the damp environment that allowed mildew to thrive is the same perfect conditions for mold spores to develop.

It’s best to think of mildew as a surface feeder, living off nonporous surfaces like wallpaper paste and soap scum. On the other hand, mold can take root and penetrate deeper into organic materials, such as drywall and wood, causing damage over time. It typically develops from moisture issues such as leaks, defective plumbing, and condensation.

Are Mold and Mildew Dangerous?

The most common mold and mildew symptoms include frequent runny nose, headaches, and itchy eyes. They can cause allergic reactions and inflammatory responses, such as sneezing, wheezing, and skin rash. Mold must be handled with caution, as it releases spores into the air that can cause health issues when inhaled, especially for immunocompromised people.

What To Do If Your Home Has Mold or Mildew

If you notice signs of mold or mildew in your home, the most important first step is not cleaning. It’s identifying and addressing the underlying moisture issue. Mold growth is almost always the result of excess moisture from leaks, humidity, or poor ventilation. Until that source is resolved, the problem will recur.

Start by observing where the issue is occurring. Bathrooms, kitchens, windows, and plumbing fixtures are common problem areas. In some cases, you may also need to check less visible spaces, such as behind furniture, inside cabinets, or near HVAC systems.

Note that mold remediation is regulated in Texas. There are specific guidelines for handling large areas. If visible mold covers a larger contiguous area (generally around 25+ square feet), remediation should be performed by a licensed professional.

Consider professional help if:

• The affected area is large or spreading
• The mold appears on porous materials like drywall or carpet
• There is a persistent musty odor throughout the home
• You’ve experienced water damage 
• Household members are experiencing allergy-like symptoms

Licensed mold assessors and remediation professionals are trained to identify the source of the issue, develop a proper remediation plan, and ensure the problem is resolved for good.

Detect Mildew Early with a Home Inspection

Because mold is often tied to hidden moisture problems, professional mold inspectors can help identify early warning signs before they become more serious. Inspectors can spot potential problems before they continue to mold and mildew growth.

Remember, the goal isn’t just to remove mold. It’s to prevent it from coming back. Addressing moisture at the source and knowing when to bring in a licensed professional are the most important steps you can take to protect both your home and your health.