Borough, York County

Radon Mitigation in Wellsville, PA

Updated September 30, 2026

Wellsville is a borough in York County with about 239 residents and 110 homes, median year built 1938. It is surrounded by Warrington Township. Nearly the whole borough is a historic district, known for its brick sidewalks and Greek Revival houses. 33.6% of PA DEP radon tests in its ZIP codes came back at or above the action level, below the county's 52.5%.

What the PA DEP test records show for Wellsville

ZIP 17365 covers essentially all of Wellsville, so these numbers are about as local as public radon data gets.

Look past the median to the high end. One test in 22 here came in at 20 pCi/L or more, five times the action level, and the highest reading on record is 92 pCi/L. Neighboring houses can differ by a factor of ten, so none of this tells you what your house is. It tells you the odds are high enough that a $15 to $30 test kit is worth buying.

Tests people chose to run, not a random survey. Details on the York County radon levels page.

Basement readings versus first-floor readings

In ZIP 17365, basement tests have a median of 3 pCi/L, while tests taken on the first floor have a median of 0.9 pCi/L (51 first-floor tests). The basement number runs 3.3 times the first-floor number, which is the usual pattern: radon comes up from the soil, so it is strongest at the lowest level and gets diluted as it moves up through the house.

Housing in Wellsville and what it means for a system

Census Bureau, American Community Survey 2020 to 2024:

59.1% of the homes in Wellsville were built before 1940, against 18.3% county-wide. Houses that old usually sit on stone or early block foundations with no vapor barrier and plenty of joints, which gives soil gas more ways in. They are still very fixable. The installer just spends more time sealing, and sometimes needs a second suction point, which is why these jobs tend to land toward the upper end of the cost range.

70% of homes in Wellsville are single-family detached. A detached house with a basement is the easiest layout to mitigate: one suction point through the slab, a fan outside or in the garage, and a vent above the roof line. It is the standard sub-slab depressurization job covered step by step on our mitigation process page, and it usually lands in the middle of the cost range.

Cost-wise, expect older houses in Wellsville to land in the $1,200 to $2,500 part of the range once sealing and a possible second suction point are counted. Newer houses are usually the standard $800 to $1,500 job. Full ranges on the cost page.

Where we work in Wellsville

Main roads include Route 74. Nearly the whole borough is a historic district, known for its brick sidewalks and Greek Revival houses.

Installers must hold a PA DEP radon mitigation certification (how to check), and permit questions go to the borough office at wellsvilleborough.com.

Common questions

Is radon a problem in Wellsville?

Yes. PA DEP has 440 tests on record from the ZIP code covering Wellsville, and 33.6% of them came back at or above the EPA's 4.0 pCi/L action level. 4.5% were at 20 pCi/L or more. The county-wide rate is 52.5%.

What is the average radon level in ZIP 17365?

The median of 440 PA DEP tests in ZIP 17365 is 2.8 pCi/L and the mean is 5.1 pCi/L. The top reading on record there is 92 pCi/L.

Nearby

Warrington Township 46%, Washington Township 46.4%. Share of PA DEP tests at or above 4.0 pCi/L, against 33.6% here.