Every York County ZIP With Data Averages Above the Action Level
Pennsylvania's Department of Environmental Protection publishes radon test results by ZIP code. Pulled for 39 York County ZIPs, the picture is unambiguous: of the 34 with enough tests for DEP to report a figure, 34 average at or above the EPA action guideline of 4 picocuries per litre. That is every single one.
The county-wide basement average across 53,881 reported tests runs well into the double digits in most of these ZIPs. Glenville (17329) carries the highest basement average at 24.0 pCi/L. The highest single result in the county appears in Hanover (17331) at 1259.7 pCi/L — a reading that is not a rounding error or a faulty kit, but a house somebody was living in.
One caution before reading the table: these are averages of tests people chose to submit, which is not the same as a random sample of every building. They tell you what the ground in an area tends to produce. They cannot tell you what your own house will read, because that depends on the soil directly beneath your foundation and on how that foundation is built and ventilated. Neighbouring houses routinely differ.
York County Radon Test Results by ZIP Code
| ZIP | Area | Basement avg (pCi/L) | Basement max | First floor avg | Tests |
|---|---|---|---|---|---|
| 17329 | Glenville | 24.0 | 454.9 | — | 391 |
| 17309 | Brogue | 23.6 | 278.3 | — | 140 |
| 17368 | Wrightsville | 23.0 | 1040.9 | 8.2 | 657 |
| 17362 | Spring Grove | 21.0 | 672.9 | 9.3 | 1,742 |
| 17322 | Felton | 20.8 | 445.4 | 6.4 | 547 |
| 17342 | Loganville | 20.3 | 123.8 | — | 30 |
| 17302 | Airville | 18.7 | 249.0 | — | 247 |
| 17366 | Windsor | 17.9 | 237.5 | 12.5 | 493 |
| 17327 | Glen Rock | 17.4 | 397.4 | 7.5 | 1,083 |
| 17407 | York (southwest) | 16.8 | 383.0 | 5.1 | 415 |
| 17313 | Dallastown | 16.7 | 292.0 | 11.6 | 1,542 |
| 17356 | Red Lion | 16.3 | 487.5 | 7.2 | 2,835 |
| 17360 | Seven Valleys | 16.3 | 317.7 | 13.2 | 971 |
| 17363 | Stewartstown | 15.1 | 333.2 | 8.7 | 1,834 |
| 17406 | York (northeast) | 13.5 | 409.5 | 4.8 | 2,145 |
| 17347 | Mount Wolf | 13.3 | 273.4 | 6.1 | 778 |
| 17321 | Fawn Grove | 12.7 | 120.2 | — | 289 |
| 17352 | New Park | 12.7 | 110.7 | — | 91 |
| 17403 | York (south/Spring Garden) | 12.3 | 434.6 | 9.0 | 5,052 |
| 17402 | York (east/Springettsbury) | 11.7 | 260.0 | 6.4 | 6,377 |
| 17314 | Delta | 11.6 | 386.1 | 5.9 | 593 |
| 17331 | Hanover | 11.0 | 1259.7 | 5.7 | 7,900 |
| 17408 | York (west) | 10.0 | 203.1 | 6.2 | 2,122 |
| 17349 | New Freedom | 9.4 | 239.6 | 6.8 | 1,612 |
| 17361 | Shrewsbury | 9.0 | 124.0 | 6.0 | 1,144 |
| 17364 | Thomasville | 8.7 | 121.9 | 4.0 | 255 |
| 17404 | York (west/West York) | 7.7 | 534.0 | 4.4 | 5,124 |
| 17315 | Dover | 7.4 | 547.0 | 3.7 | 2,250 |
| 17339 | Lewisberry | 7.4 | 382.0 | 4.1 | 1,389 |
| 17319 | Brogue area | 7.0 | 343.4 | 4.7 | 1,998 |
| 17345 | Manchester | 7.0 | 695.6 | 5.0 | 664 |
| 17370 | York Haven | 6.8 | 176.0 | 3.8 | 707 |
| 17365 | Wellsville | 5.0 | 47.3 | 1.4 | 258 |
| 17401 | York (city) | 4.3 | 23.1 | 1.9 | 206 |
| 17317 | Emigsville | Insufficient data — suppressed by PA DEP | |||
| 17318 | Etters | Insufficient data — suppressed by PA DEP | |||
| 17355 | Railroad | Insufficient data — suppressed by PA DEP | |||
| 17371 | York New Salem | Insufficient data — suppressed by PA DEP | |||
| 17311 | Codorus | Insufficient data — suppressed by PA DEP | |||
Highlighted rows average at or above 16 pCi/L — four times the EPA action guideline. Source: Pennsylvania Department of Environmental Protection, radon test results by ZIP code. Figures are averages of tests submitted to DEP, not a prediction for any individual property.
How to Read These Numbers
At or above 4 pCi/L the EPA recommends taking action. Between 2 and 4, mitigation is worth considering. There is no level considered entirely free of risk, and the risk is substantially higher for smokers.
Basement figures run higher than first-floor figures throughout the county, which is exactly what you would expect — radon enters through the foundation, so concentration is highest at the lowest level and dilutes as it rises. If your basement is finished and used as living space, the basement number is the one that describes your exposure.
Several ZIPs are marked as suppressed. DEP does not report figures where too few tests have been submitted. A suppressed ZIP is not a low-radon ZIP — it is an untested one, and given what the surrounding areas report, that is an argument for testing rather than against.
Where This Data Comes From
These figures come from the Pennsylvania Department of Environmental Protection's public radon reporting portal, which publishes test results by ZIP code, broken down by whether the test was placed in a basement or on the first floor. We have republished York County's ZIPs with attribution and changed nothing about the figures.
DEP states that Pennsylvania has one of the most serious radon problems in the country, and estimates that 40 percent of homes tested in the Commonwealth exceed the EPA action guideline. York County's numbers sit well above that statewide picture.
If you want to look up a ZIP outside York County, DEP's portal covers the whole Commonwealth. And if you want to know your own number rather than your area's, that takes a test.
Questions About Radon?
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