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Overview
NOAA records show Arlington averaging 41.8 inches of rain and 59.3 F annually, meaning it sees a mix of wet spells and dry breaks.
The broader Virginia climate, including seasonal humidity peaks and storm activity, shapes the indoor moisture environment alongside local conditions.
Arlington has humid summers and variable winters, so condensation and rain can affect basements and multifamily buildings.
Code Enforcement enforces maintenance and private property ordinances for safe occupancy.
This guide highlights local moisture drivers, seasonal risk, and prevention steps. For legal rights and landlord obligations, review the Virginia mold laws guide.
Sources: [Virginia - Climate | Britannica] | [Arlington Code Enforcement] | [NOAA Climate Normals - WASHINGTON REAGAN AP, VA US]
Action Checklist
Arlington Home Inspection Checklist
Common construction types in Arlington affect where moisture problems develop. Here is how local building patterns shape what to inspect.
In Arlington, code Enforcement enforces the Virginia Maintenance Code and the Condition of Private Property ordinance.
Staff respond to complaints and inspect properties for compliance.
Sources: [Arlington Code Enforcement]
- Roughly 41.8 inches of annual rain in Arlington means gutter maintenance and drainage checks should be part of the routine.
- Roof drains, flashing, and gutter outlets.
- Basement walls and below-grade entry points.
- Window frames, sills, and exterior caulk.
- Bathroom exhaust fans and vent ducts.
- HVAC condensate lines and drip pans.
- Under sink plumbing and cabinet bases.
- Laundry hoses and appliance connections.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - WASHINGTON REAGAN AP, VA US]
Warning Signs of Mold in Arlington
Watch for these signs that moisture is lingering in Arlington homes and rentals:
- Window condensation that persists during warm weather in Arlington (average temperature 59.3 F) often signals excess indoor humidity.
- Musty odors near basement stairs.
- Condensation that returns on windows each morning.
- Peeling paint near baseboards or trim.
- Dark staining around ceiling corners or vents.
- Soft drywall around tubs or showers.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - WASHINGTON REAGAN AP, VA US]
Mold Risk Factors in Arlington
These are the most common moisture drivers for homes and rentals in Arlington:
- Arlington averages 41.8 inches of precipitation per year, so storm events and small leaks both matter.
- Summer humidity loads HVAC systems and can cause duct sweating.
- Below-grade units can collect moisture after heavy rain.
- Shared walls and stacked plumbing can hide slow leaks.
- Clogged roof drains or gutters can lead to water intrusion.
- Window condensation can persist during shoulder seasons.
Sources: [Virginia - Climate | Britannica] | [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - WASHINGTON REAGAN AP, VA US]
Arlington Seasonal Risk Calendar
Winter
Cool, damp spells raise condensation indoors.
Spring
Rain increases basement and window leak risk.
Summer
An average of 59.3 F drives extended cooling seasons. Monitor HVAC condensate and use dehumidifiers in below-grade spaces.
Fall
Temperature swings and rain test seals.
Sources: [Virginia - Climate | Britannica] | [NOAA Climate Normals - WASHINGTON REAGAN AP, VA US]
Arlington Moisture Playbook
Use this short playbook to stay ahead of common moisture problems in Arlington.
After a Leak
Stop the leak, remove wet materials within 24 to 48 hours, and dry the area with airflow.
Monthly Maintenance
Inspect under sinks, clear condensate lines, and log indoor humidity.
Seasonal Tune Up
Before storm season, clear gutters and inspect flashing; about 41.8 inches of annual precipitation means small leaks can add up.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - WASHINGTON REAGAN AP, VA US]
Mold Prevention in Arlington
Use these priorities to keep indoor humidity low and avoid recurring growth:
- With 41.8 inches of rain annually, direct all roof runoff away from the foundation using clean gutters and extended downspouts.
- 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 drains and window seals annually.
- Service HVAC condensate drains annually.
Sources: [EPA Mold, Moisture, and Your Home] | [NOAA Climate Normals - WASHINGTON REAGAN AP, VA US]
State Laws and Rights
Virginia mold law snapshot
Virginia has mold-specific rules in addition to general habitability standards.
Under the Virginia Residential Landlord and Tenant Act, landlords must comply with applicable building and housing codes materially affecting health and safety, make all repairs necessary to keep the premises in fit and habitable condition, and maintain the premises to prevent moisture accumulation and mold growth. The implied warranty of habitability is codified in Section 55.1-1220, which requires landlords to maintain electrical, plumbing, heating, ventilating, and air-conditioning systems in good working order. Mold that results from landlord failure to maintain the premises or address water intrusion may constitute a breach of the warranty of habitability.
Use the full Virginia guide for tenant rights, landlord responsibilities, and remedies.