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Houston, Texas mold guide

Mold Guide for Houston, Texas

Local mold risk drivers, seasonal priorities, and next steps for homeowners and renters in Houston.

State law data last updated: 2026-02-02

Overview

NOAA records show Houston averaging 50.8 inches of rain and 69.8 F annually, meaning it sees frequent wet weather.

The broader Texas climate, including seasonal humidity peaks and storm activity, shapes the indoor moisture environment alongside local conditions.

Houston has hot, humid summers and heavy rain events, so moisture can linger without active drying.

Houston Community and Code Enforcement addresses neighborhood protection and code concerns.

This guide highlights local moisture drivers, seasonal risk, and prevention steps. For legal rights and landlord obligations, review the Texas mold laws guide.

Sources: [Texas - Drainage | Britannica] | [Houston Community and Code Enforcement] | [NOAA Climate Normals - HOUSTON HOOKS MEM AP, TX US]

Action Checklist

Get free access to the full guide

8-step checklist for immediate action

Houston Home Inspection Checklist

Common construction types in Houston affect where moisture problems develop. Here is how local building patterns shape what to inspect.

In Houston, community and Code Enforcement addresses neighborhood protection and code concerns.

Documenting moisture issues helps support inspection follow up.

Sources: [Houston Community and Code Enforcement]

  • With 50.8 inches of annual rain, Houston homes need attic and basement checks after every heavy storm.
  • Roof flashing, gutters, and downspout extensions.
  • Window and door seals exposed to wind driven rain.
  • Attic insulation and ventilation near roof penetrations.
  • HVAC condensate drain lines and drip pans.
  • Bathroom exhaust fans and vent ducts.
  • Slab edges, garage walls, and utility penetrations.
  • Under sink plumbing and cabinet bases.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - HOUSTON HOOKS MEM AP, TX US]

Warning Signs of Mold in Houston

Watch for these signs that moisture is lingering in Houston homes and rentals:

  • At an annual average of 69.8 F, Houston homes that show condensation on windows during warm months likely have an indoor moisture problem.
  • Musty odors after storms or humid stretches.
  • Condensation on windows or AC supply vents.
  • Bubbling paint near exterior walls.
  • Dark spotting near ceiling corners.
  • Soft drywall around tubs or showers.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - HOUSTON HOOKS MEM AP, TX US]

Mold Risk Factors in Houston

These are the most common moisture drivers for homes and rentals in Houston:

  • Annual rainfall near 50.8 inches means Houston homes face consistent exposure to roof leaks, window seepage, and foundation moisture.
  • High humidity slows drying after leaks.
  • Tropical systems can bring wind driven rain along the coast.
  • Intense thunderstorms produce heavy rain and localized flooding.
  • Warm seasons increase cooling and condensate loads.
  • Low lying areas and slab edges can hold moisture after storms.

Sources: [Texas - Drainage | Britannica] | [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - HOUSTON HOOKS MEM AP, TX US]

Houston Seasonal Risk Calendar

Spring

Thunderstorms increase. Inspect roof edges and window seals after heavy rain.

Summer

At 69.8 F annually, air conditioning runs much of the year. Inspect condensate drains regularly and dehumidify lower levels.

Fall

Tropical systems can bring heavy rain. Clear gutters and confirm drainage.

Winter

Cooler air lowers humidity, but condensation can form in tight homes.

Sources: [Texas - Drainage | Britannica] | [NOAA Climate Normals - HOUSTON HOOKS MEM AP, TX US]

Houston Moisture Playbook

Use this short playbook to stay ahead of common moisture problems in Houston.

After a Leak

Stop the leak, remove wet materials within 24 to 48 hours, and dry with airflow and dehumidification.

Monthly Maintenance

Clear condensate lines, inspect under sinks, and log indoor humidity.

Seasonal Tune Up

Clear gutters and inspect flashing before heavy rain arrives. At 50.8 inches yearly, maintaining 30 to 50 percent indoor humidity helps prevent growth.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - HOUSTON HOOKS MEM AP, TX US]

Mold Prevention in Houston

Use these priorities to keep indoor humidity low and avoid recurring growth:

  • Gutters and downspouts need regular clearing to handle 50.8 inches of yearly precipitation and keep water away from the foundation.
  • Maintain indoor humidity between 30 and 50 percent.
  • Dry wet materials within 24 to 48 hours.
  • Vent bathrooms and kitchens outdoors.
  • Clear gutters and direct downspouts away from foundations.
  • Inspect roof flashing and window seals before storm season.
  • Service HVAC condensate drains annually.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - HOUSTON HOOKS MEM AP, TX US]

Local Regulations

Some cities in Texas publish additional housing rules or enforcement guidance that can affect mold complaints.

Local regulations are available with the Mold Toolkit

1 city-specific regulations

State Laws and Rights

Texas mold law snapshot

Texas has mold-specific rules in addition to general habitability standards.

Texas recognizes an implied warranty of habitability requiring landlords to maintain rental properties in a condition fit for human habitation. Under Texas Property Code Section 92.052, landlords must make a diligent effort to repair conditions that materially affect the physical health or safety of an ordinary tenant. While mold is not specifically mentioned in the statute, courts have applied this standard to mold issues when they pose health risks. Examples of conditions affecting health and safety include sewage backups, roaches, rats, no hot water, faulty wiring, and roof leaks. Mold caused by these types of conditions falls under the landlord's duty to repair.

Use the full Texas guide for tenant rights, landlord responsibilities, and remedies.

Frequently Asked Questions

What are the first signs of mold in a Houston home?
Musty odors, condensation on windows, peeling paint, and dark spots near vents or ceilings are common early signs. If symptoms persist after cleaning, schedule an inspection.
When should I hire a mold professional in Houston?
If the affected area is larger than about 10 square feet, if growth returns after cleaning, or if anyone has health symptoms, hire a pro. Use the DIY vs pro guide to decide.
Does Houston humidity make mold more likely?
High outdoor humidity slows drying after leaks, which raises risk. Active ventilation and dehumidification are key. Review prevention priorities for humid climates.
What indoor humidity level is safe in Houston?
Keep indoor relative humidity between 30 and 50 percent. In Houston, that often means running a dehumidifier or air conditioning. See our humidity control guide for setup tips.
What should I do about mold after a Houston storm?
Stop the water source, remove wet materials within 48 hours, and run fans and dehumidifiers. Photograph damage for insurance. See the storm recovery guide.
Do temperature swings in Houston cause mold?
Large temperature changes can cause condensation in attics and crawl spaces. Seal penetrations and maintain balanced airflow. See our attic mold guide.