Township, York County

Radon Mitigation in Warrington Township, PA

Updated September 30, 2026

Warrington Township is a township in York County with about 4,584 residents and 1,896 homes, median year built 1982. It includes Rossville and the area around Wellsville. Gifford Pinchot State Park is in the township. 46% 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 Warrington Township

ZIP codes don't follow township lines, so the 3 ZIP codes below also take in some homes just outside Warrington Township.

• ZIP 17365 (about 43% of Warrington Township's land): median 2.8 pCi/L across 440 tests, 4.5% at 20 or higher, top reading 92. Basement median 3, first floor 0.9.
• ZIP 17019 (about 27% of Warrington Township's land): median 3.6 pCi/L across 5,858 tests, 6.9% at 20 or higher, top reading 228. Basement median 4, first floor 1.8.
• ZIP 17339 (about 21% of Warrington Township's land): median 3.4 pCi/L across 2,150 tests, 5.8% at 20 or higher, top reading 382. Basement median 3.7, first floor 2.6.

The spread inside Warrington Township runs from 33.6% of tests high in 17365 to 47.4% in 17019.

Look past the median to the high end. One test in 15 here came in at 20 pCi/L or more, five times the action level, and the highest reading on record is 382 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 Warrington Township and what it means for a system

Census Bureau, American Community Survey 2020 to 2024:

17.9% of homes in Warrington Township are mobile or manufactured homes, well above the county's 4.1%. Those sit over a crawlspace or skirted pad rather than a basement, and the fix is different: a sealed membrane over the soil with suction under it. See crawlspace radon for what that involves.

78.3% of homes in Warrington Township 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, a basement house here is the standard $800 to $1,500 job, while a mobile home or crawlspace house usually runs $1,500 to $3,000 because of the membrane work. Full ranges on the cost page.

Where we work in Warrington Township

Gifford Pinchot State Park is in the township.

Installers must hold a PA DEP radon mitigation certification (how to check), and permit questions go to the township office at www.warringtontwp.org.

Common questions

Is radon a problem in Warrington Township?

Yes. PA DEP has 8,448 tests on record from the ZIP codes covering Warrington Township, and 46% of them came back at or above the EPA's 4.0 pCi/L action level. 6.5% 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

Carroll Township 47.4%, Dillsburg 47.4%, Dover Borough 44.2%, Lewisberry 44.9%, Wellsville 33.6%. Share of PA DEP tests at or above 4.0 pCi/L, against 46% here.