621 4th Street Southwest, Washington
technical data · neighborhood and transit
Quick answers
- Does 621 4th Street Southwest have open permits or code violations?
- DC Department of Buildings lists 2 permits, 2 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 621 4th Street Southwest at risk for?
- FEMA's National Risk Index rates the area relatively high overall, with elevated earthquake and hurricane risk.
Permits and code violations
2 permits not closed out. Unfinished permits pass to the next owner.
- Construction Apr 2026Permit issued
Installation of a new 42 inches high wrought iron fence in the front yard. total length is 33 linear feet including one (1) 3' wide single-swing gate. fence consists of 2 inch posts, 1/2 inch pickets, and 2 rails. all work is on private property and complies with the 50% openness requirement for front yard fences in historic districts.
- Home occupation Apr 2022Permit issued
Home office - web-based retail (business administration only)
DC Department of Buildings
Safety and environment
FEMA natural hazard risk
Relatively High
Highest for this area: earthquake, hurricane, tornado, coastal flooding, inland flooding, strong wind, hail, heat wave. These drive insurance cost here.
FEMA National Risk Index, census tract
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
11 within 1,650 ft
Nearest: Chevron Usa Inc, 501 4th St Sw (200 ft), no further action. Every release here is closed by the state regulator.
EPA UST Finder, leaking underground storage tank releases
Toxic release facility
4,300 ft
Us Department Of The Treasury Bureau Of Engraving Printing and 3 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
Social Security Administration Building. Exterior changes can need preservation review; listed buildings can qualify for rehabilitation tax credits.
National Park Service, National Register
High-voltage line
200 ft
138 kV line run by POTOMAC ELECTRIC POWER CO.
HIFLD transmission lines
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
700 ft
Amidon-Bowen ES (700 ft), Richard Wright PCS for Journalism and Media Arts (950 ft), Washington Global PCS (1,000 ft). Confirm the assigned school with the district.
U.S. Department of Education, NCES
Major airport
2.3 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 4th Street Southwest
All addressesViewing recommendations
What's worth checking in person before deciding.
- Test water pressure and temperature at the tap, in the bathroom and kitchen, for at least a minute.
- 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.
- Ask what heating system is in place (own boiler, wood, gas) and request the last winter month's bills.
- 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.
- Ask to see the construction documents (permit, sign-off) and check for visible cracks on the facade or in the attic/basement.
- Check the roof, gutters, and downspouts for signs of leaks or recent repairs, especially if it has rained recently.
Neighborhood recommendations are derived from public OpenStreetMap data and may be incomplete. Checking in person is still what matters most.