Borough, York County

Radon Mitigation in Lewisberry, PA

Updated September 30, 2026

Lewisberry is a borough in York County with about 530 residents and 210 homes, median year built 1948. It is surrounded by Newberry Township. The area's original Quaker meeting house stands at Old Quaker and Lewisberry roads. 44.9% 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 Lewisberry

ZIP 17339 covers essentially all of Lewisberry, so these numbers are about as local as public radon data gets.

The share that matters most is the 20+ column. 5.8% of tests here came in at 20 pCi/L or more, five times the action level. The single highest reading on record in these ZIP codes 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 17339, basement tests have a median of 3.7 pCi/L, while tests taken on the first floor have a median of 2.6 pCi/L (195 first-floor tests). The gap is smaller than in most of the county, which means readings upstairs here are not much of a relief from the basement number.

Radon results by decade in ZIP 17339

The share peaked in the 2000s at 52.3% and sits at 36.7% for tests since 2020. A drop that size is mostly about who is testing, not the ground. More recent tests come from home sales and from retests after a system went in, and both pull the share down. The rock under Lewisberry has not changed. 387 tests have been logged in 17339 since 2020, so people here are still testing.

Housing in Lewisberry and what it means for a system

Census Bureau, American Community Survey 2020 to 2024:

43.8% of the homes in Lewisberry 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.

80% of homes in Lewisberry 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 Lewisberry 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 Lewisberry

Main roads include Route 177 and Route 382. The area's original Quaker meeting house stands at Old Quaker and Lewisberry roads.

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

Common questions

Is radon a problem in Lewisberry?

Yes. PA DEP has 2,150 tests on record from the ZIP code covering Lewisberry, and 44.9% of them came back at or above the EPA's 4.0 pCi/L action level. 5.8% were at 20 pCi/L or more. The county-wide rate is 52.5%.

What is the average radon level in ZIP 17339?

The median of 2,150 PA DEP tests in ZIP 17339 is 3.4 pCi/L and the mean is 7.1 pCi/L. A mean that far above the median means a long tail of very high readings, topping out at 382 pCi/L.

Nearby

Fairview Township 43.4%, Warrington Township 46%, Monaghan Township 46.6%, Newberry Township 41.8%. Share of PA DEP tests at or above 4.0 pCi/L, against 44.9% here.