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Charleston, South Carolina mold guide

Mold Guide for Charleston, South Carolina

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

State law data last updated: 2026-02-13

Overview

NOAA records show Charleston averaging 52.5 inches of rain and 66.5 F annually, meaning it sees frequent wet weather.

Regional weather across South Carolina adds another layer of moisture risk, as statewide storm seasons and humidity shifts affect indoor conditions.

Charleston has a coastal subtropical climate with hot, humid summers and mild winters, keeping moisture elevated much of the year.

Charleston Public Service includes building inspections and environmental code enforcement.

Charleston County Building Inspection Services enforces building codes and provides a code enforcement contact line.

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

Sources: [South Carolina - Climate | Britannica] | [Charleston Public Service] | [NOAA Climate Normals - CHARLESTON INTL AP, SC US] | [Building Inspection Services - Charleston County]

Action Checklist

Get free access to the full guide

8-step checklist for immediate action

Charleston Home Inspection Checklist

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

In Charleston, public Service lists building inspections and environmental code enforcement services.

Documenting moisture issues supports inspection follow up.

Sources: [Charleston Public Service]

  • At 52.5 inches of yearly precipitation, post-storm attic and basement inspections are critical for Charleston homes.
  • Roof flashing, gutters, and downspout extensions.
  • Window and door seals exposed to wind driven rain.
  • Crawl spaces and vapor barriers.
  • Bathroom exhaust fans venting outdoors.
  • HVAC condensate drain lines and drip pans.
  • Laundry hoses and shutoff valves.
  • Kitchen cabinet bases around plumbing.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - CHARLESTON INTL AP, SC US]

Warning Signs of Mold in Charleston

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

  • Persistent window condensation in Charleston (annual average 66.5 F) is a common early indicator that indoor humidity is too high.
  • Musty odors after 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 - CHARLESTON INTL AP, SC US]

Mold Risk Factors in Charleston

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

  • With 52.5 inches of annual precipitation in Charleston, water intrusion through roofs, windows, and foundation joints requires ongoing attention.
  • High summer humidity slows drying after leaks.
  • Afternoon thunderstorms bring heavy rain that tests roofs and window seals.
  • Tropical systems can deliver wind driven rain along the coast.
  • Warm winters keep indoor humidity from dropping much.
  • Crawl spaces and lower levels can stay damp after storms.

Sources: [South Carolina - Climate | Britannica] | [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - CHARLESTON INTL AP, SC US]

Charleston Seasonal Risk Calendar

Spring

Thunderstorms increase. Inspect roof edges and clear gutters.

Summer

Year-round cooling demand at 66.5 F average means condensate management and lower-level dehumidification are essential.

Fall

Tropical systems can bring heavy rain. Confirm drainage away from foundations.

Winter

Mild winters still allow condensation in tight homes. Keep airflow moving.

Sources: [South Carolina - Climate | Britannica] | [NOAA Climate Normals - CHARLESTON INTL AP, SC US]

Charleston Moisture Playbook

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

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

Ahead of peak rain and the area's 52.5 inches of annual precipitation, clean gutters, check flashing, and target 30 to 50 percent indoor humidity.

Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - CHARLESTON INTL AP, SC US]

Mold Prevention in Charleston

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

  • Annual rainfall near 52.5 inches makes gutter maintenance and proper downspout drainage a top prevention priority.
  • 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 - CHARLESTON INTL AP, SC US]

Local Regulations

Some cities in South Carolina 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

South Carolina mold law snapshot

South Carolina does not have a mold-specific statute, but habitability rules still apply.

South Carolina's implied warranty of habitability is established under SC Code Section 27-40-440. Landlords must comply with applicable building and housing codes materially affecting health and safety, make all repairs necessary to keep the premises in a fit and habitable condition, keep common areas reasonably safe and clean, maintain all electrical, gas, plumbing, sanitary, heating, ventilating, and air conditioning systems in reasonably good and safe working order, and provide running water, hot water, and reasonable heat at all times. While mold is not explicitly mentioned, severe mold conditions may breach the landlord's duty to provide a safe and habitable living environment.

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

Frequently Asked Questions

What are the first signs of mold in a Charleston 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 Charleston?
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.
Are coastal homes in Charleston more prone to mold?
Fog, wind-driven rain, and elevated humidity put coastal homes at higher risk. Focus on ventilation, dehumidification, and exterior maintenance. Check our room-by-room guide.
How does salt air affect mold growth in Charleston?
Salt air keeps humidity high and can wear down seals and caulk. Inspect exterior joints and ventilate crawl spaces regularly. See our prevention guide.
Does Charleston 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 Charleston?
Keep indoor relative humidity between 30 and 50 percent. In Charleston, that often means running a dehumidifier or air conditioning. See our humidity control guide for setup tips.