Washington summers are hot and humid, and many homes are older row houses with basements below street level. Together, that makes damp basements, poorly ventilated bathrooms and old leaks common sources of mold across the District.
Sifixit is a free referral service. Call the number on this page and you will be connected with an independent mold removal provider that serves the Washington area, where one is available for your ZIP code. Calling costs nothing and you are never obliged to hire anyone.
Why mold grows in Washington
Humid summers
Warm, humid air from late spring to early fall keeps basements and closets damp, especially without air conditioning or a dehumidifier.
Row house basements
Basements below street level often have brick or stone foundations that let moisture through, and they flood first in heavy storms.
Older plumbing
Many homes have aging pipes that can leak slowly inside walls and ceilings, feeding hidden mold.
Storms and backups
Flash floods and sewer backups soak basements, and mold follows if they are not dried quickly.
Areas across Washington
Sifixit connects callers across the city of Washington, including neighborhoods such as Capitol Hill, Georgetown, Adams Morgan, Columbia Heights, Petworth, Bloomingdale, Navy Yard, Brookland and Anacostia, and in nearby cities such as Arlington, Alexandria, Silver Spring, Bethesda, Takoma Park and Hyattsville.
Sifixit does not have an office or staff in Washington. Providers you speak to are independent local businesses, and availability depends on your ZIP code and the job.
Permits and local rules
Cleanup itself does not usually need a permit, but the repairs that follow often do. Inside the city of Washington, larger drywall, electrical and plumbing repairs can require permits from the DC Department of Buildings. Homes in other cities, such as Arlington, Alexandria or Silver Spring, follow the rules of that city or county.
In the District, home improvement contractors must be licensed through the Department of Licensing and Consumer Protection, and you can check a license online.
Seasonal risks in Washington
If anyone in the home has asthma, a weak immune system or breathing problems, keep them away from the moldy area and speak to a doctor about any symptoms.
- Summer: humidity is highest, and basements stay damp.
- Storm season: flash floods soak basements.
- Winter: condensation forms on cold walls and windows.
- All year: slow leaks can feed hidden mold.
Be prepared
- Run a dehumidifier in the basement during humid months
- Use bathroom fans that vent outside
- Fix leaks and dry any water within a day
- Keep gutters and downspouts clear and pointed away from the house
- Check basement walls and corners for dark spots and a musty smell
Learn more before you call
Our main mold removal guide explains the warning signs, what affects the cost, what you can safely handle yourself and the questions to ask before you hire. It applies in Washington just as it does everywhere else.
Washington questions
Does DC license mold removal companies?
Yes. The District licenses mold assessors and mold remediators through the Department of Energy and Environment. Ask any provider for their DC license.
I rent. Who is responsible for mold?
DC law requires landlords to address indoor mold in rental housing. Tell your landlord in writing and keep a copy.
Do I need mold testing?
Usually not if you can see the mold. Testing helps find hidden mold or confirm that removal worked.
Does Sifixit have an office in Washington?
No. Sifixit is a referral service. Providers you speak to are independent local businesses that serve the Washington area.
Sifixit is a free referral service and does not provide home services. Calls may be answered by a partner call center or connected directly to independent local providers, who are solely responsible for their work, pricing, licensing and insurance.