422 O Street Southwest, Washington
technical data · neighborhood and transit
Quick answers
- Is 422 O Street Southwest in a flood zone?
- No. FEMA maps it in Zone X, outside the high-risk flood area. Flood insurance is optional.
- Does 422 O Street Southwest have open permits or code violations?
- DC Department of Buildings lists 15 permits, 15 not closed, and 0 violations.
- What is the 2026 conforming loan limit in District of Columbia?
- $1,249,125 for a single-unit home, per FHFA. Larger loans are jumbo loans.
- Is radon a problem here?
- EPA radon zone 2, moderate potential.
- What natural disasters is 422 O Street Southwest at risk for?
- FEMA's National Risk Index rates the area relatively moderate overall, with elevated inland flooding risk.
Permits and code violations
15 permits not closed out. Unfinished permits pass to the next owner.
- Supplemental Oct 2026Permit revoked payment du
- Supplemental Apr 2026Permit issued
- Home occupation Apr 2026Permit issued
Home office - general contractor
- Construction Nov 2025Permit issued
Commission of fine arts jurisdiction area single family home, interior remodel & rear 3-story addition. proposed area of work: 2,000 sf
- Supplemental May 2025Permit issued
- Construction May 2025Permit issued
To install 6.48kw size of solar panels on roof of building.
- Supplemental Oct 2024Permit issued
- Supplemental Sep 2024Permit issued
- Supplemental May 2024Permit issued
- Shop drawing Apr 2024Expired
Commission of fine arts jurisdiction area supply and install a heritage residential elevator 44"x42" (5 stop)
- Construction Mar 2024Permit issued
Revision to permit # b2400363: - extend the proposed addition an additional 25 inches into the rear yard. - revised mechanical layout. original scope of work: -1st, 2nd, & 3rd floor interior remodel-4th floor addition-rear yard addition.
- Supplemental Feb 2024Expired
Electrical trade permit
DC Department of Buildings
Safety and environment
FEMA natural hazard risk
Relatively Moderate
Highest for this area: inland flooding. These drive insurance cost here.
FEMA National Risk Index, census tract
FEMA flood zone
Zone X
Moderate flood hazard: a 0.2% annual chance. Flood insurance is optional and usually cheaper here.
FEMA National Flood Hazard Layer (FIRM)
Superfund site
1.7 mi
Washington Navy Yard (NPL Site). Check groundwater and vapor reports on the EPA site page.
EPA National Priorities List
Leaking fuel tanks
6 within 1,650 ft
Nearest: Unknown, 1000-1100 6th St Sw (1,400 ft), open. 1 still open. Ask whether groundwater or soil vapor testing was done.
EPA UST Finder, leaking underground storage tank releases
Brownfield site
2,300 ft
1714 Second Street Property and 1 more within half a mile. Former industrial land in EPA's cleanup and reuse program.
EPA ACRES Brownfields
Toxic release facility
2,850 ft
Superior Concrete Materials Inc Dc and 4 more within a mile. Reports chemical releases to air, water or land to EPA each year.
EPA Toxics Release Inventory
Historic listing nearby
300 ft
Harbour Square and 1 more listings close by. Exterior changes can need preservation review; listed buildings can qualify for rehabilitation tax credits.
National Park Service, National Register
Radon potential
Moderate
Average indoor levels of 2 to 4 pCi/L. EPA still suggests testing ground-floor and basement units.
EPA and USGS Geologic Radon Potential Map
Nearest public schools
1,950 ft
AppleTree Early Learning PCS - Waterfront Station (1,950 ft), Amidon-Bowen ES (2,400 ft), Jefferson MS Academy (2,700 ft). Confirm the assigned school with the district.
U.S. Department of Education, NCES
Major airport
1.8 mi
Reagan National (DCA). Homes this close can sit inside the 65 dB DNL noise contour. Visit at peak hours and check the airport's noise map.
FAA large-hub airports
Conforming loan limit 2026
$1,249,125
District of Columbia. Mortgages up to this amount qualify for Fannie Mae and Freddie Mac pricing. Above it, the loan is a jumbo with stricter terms.
FHFA Conforming Loan Limit Values, one-unit
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More on O Street Southwest
All addressesViewing recommendations
What's worth checking in person before deciding.
- This is a house, not an apartment. Check the lot boundaries, car access, and how water drains from the yard after rain, including whether the neighboring lot sits higher and could send water toward the property.
- Test water pressure and temperature at the tap, in the bathroom and kitchen, for at least a minute.
- Check the sewer connection (public network or septic tank) and the water source (public network or well), including pressure and water quality.
- Check the condition of the fence, yard, and sidewalk out front: who is responsible for upkeep, and whether there are any boundary disputes with neighbors.
- Knock on a neighboring gate and ask about noise, pets, flooding, or other issues common in the area.
- Schedule a viewing in the evening too, on a weekday, to see street traffic, streetlights, and how quiet the neighborhood is after 8 PM.
- Ask what heating system is in place (own boiler, wood, gas) and request the last winter month's bills.
Neighborhood recommendations are derived from public OpenStreetMap data and may be incomplete. Checking in person is still what matters most.