521 Mountain Street, Philadelphia
technical data · neighborhood and transit
Quick answers
- Does 521 Mountain Street have open permits or code violations?
- Philadelphia Department of Licenses and Inspections lists 31 permits, 10 not closed, and 60 violations, 27 open.
- What is the 2026 conforming loan limit in Philadelphia County?
- $832,750 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 521 Mountain Street at risk for?
- FEMA's National Risk Index rates the area relatively low overall, with elevated heat wave risk.
Permits and code violations
10 permits not closed out. Unfinished permits pass to the next owner. 27 open violations.
- Plumbing permit Jan 2026Completed
Repair/replace 3/4" wdp.
- Zoning permit Apr 2025Issued
Limited lodging
- Plumbing permit Aug 2024Completed
Replace 5"curb trap with fresh air inlet.
- Plumbing permit Mar 2022Completed
Replace existing fixtures only (1) toilet (1) lav (1) tub repair.
- Plumbing permit Mar 2022Completed
Replace full water service 3/4 (main to meter)
- Plumbing permit Mar 2021Completed
Replace defective curb trap and fresh air inlet replace water service
- Mechanical / fuel gas permit Oct 2019Completed
Ahvac - install 90% 72,000 btu gas furnace heat & 3-ton a/c unit and all related ductwork with 12 diffusers and the condenser mounted on a pad in the rear yard. (see bldg permit #965398)
- Electrical permit Sep 2019Completed
New 200amp service electrical rewire/devices as per 2014 nec
- Plumbing permit Aug 2019Completed
Install stack,waste and water lines for 4-lav sinks,1-kitchen sink,2-water closets,1-tub,1-shower,1-bar sink,1-washer standpipe and 1-water heater.the installation will comply with the philadelphia plumbing code 2004 - the installation does not include garbage disposal or dishwasher
- Residential building permit Jul 2019Completed
Structural work related to stair opening details as shown on the plan ( no other work included on this application.
- General permit minor Apr 2019Completed
Iebc level 2 alteration laminate drywall/ insulate new windows/ doors/ trim/ finishes new kitchen/ bath as per ez permit standards alterations- for alterations to an existing one family dwelling as per attached standard. deviations from this standard will result in permit revocation and require submission of construction plans. structural alteration or repair is expressly prohibited under this permit. prohibited structural work includes any modification to exterior walls, party walls, floor/roof framing or foundations; underpinning and excavations (i.e. digging in basement).
- Demolition permit Jun 2017Expired
Ez interior demolition- for the interior demolition of non load-bearing partition walls and ceilings as per attached standard. deviations from this standard will result in permit revocation and require submission of construction plans.
Philadelphia Department of Licenses and Inspections
Safety and environment
FEMA natural hazard risk
Relatively Low
Highest for this area: heat wave. These drive insurance cost here.
FEMA National Risk Index, census tract
Superfund site
1.7 mi
Publicker Industries Inc. (Deleted NPL Site). Check groundwater and vapor reports on the EPA site page.
EPA National Priorities List
Leaking fuel tanks
1 within 1,650 ft
Nearest: Terri Pinto, 1703-13 S 7th St (750 ft), open. 1 still open. Ask whether groundwater or soil vapor testing was done.
EPA UST Finder, leaking underground storage tank releases
Brownfield site
1,800 ft
Growing Home Garden. Former industrial land in EPA's cleanup and reuse program.
EPA ACRES Brownfields
Toxic release facility
1,850 ft
Catalyst International Gasket Materials Corp and 3 more within a mile. Reports chemical releases to air, water or land to EPA each year.
EPA Toxics Release Inventory
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
900 ft
Kirkbride Eliza B Sch (900 ft), Southwark Sch (1,800 ft), Furness Horace HS (1,800 ft). Confirm the assigned school with the district.
U.S. Department of Education, NCES
Major airport
6.0 mi
Philadelphia International (PHL). Aircraft may be audible under approach paths.
FAA large-hub airports
Conforming loan limit 2026
$832,750
Philadelphia County. 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 Mountain Street
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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.
- Ask for the latest maintenance bill from a winter month, not a summer one: that's where the real cost of living there shows up.
- Look at the stairwell (cleanliness, smell) and the association's notice board: unpaid dues, conflicts, recent decisions.
- Knock on a neighboring door and ask two things: what bothers them most often, and what work is planned for the building.
- Schedule a viewing on a weekday too, between 6:00 and 7:30 PM, the window when the building is busiest: neighbors, parking, elevator.
- Ask specifically where you'd park: is there paid city parking, who currently holds it, what the permit costs, and how long the waitlist is.
Neighborhood recommendations are derived from public OpenStreetMap data and may be incomplete. Checking in person is still what matters most.
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