Why Dover reads lower
The typical Dover result is 3.30 pCi/L, the median across 4,041 recorded tests, against a county median of 4.30. The average here is 6.38, pulled up as every radon average is by a small number of very high readings. Dover sits among the lower reading parts of York County alongside York Haven and Etters, all three toward the Susquehanna on the northern side, away from the fractured limestone that drives the heaviest readings in the south.
That average is still above the Pennsylvania figure of 6.00, and the Dover median of 3.30 is above the Pennsylvania median of 2.50. Lower here means lower than a high county, not low in absolute terms, and everything indoors is far above the 0.4 pCi/L of outdoor air.
The share that matters more than the average: 44.2 percent of Dover tests reach or exceed 4 pCi/L. Against 52.5 percent for the county that is a real difference, and it still means a Dover house is closer to a coin flip than to a safe bet.
Dover sits in a low reading band
Dover is not an isolated pocket. Every ZIP code across the northern tier of York County reads on the low side, which is a stronger signal than one town's average on its own.
| Area | ZIP | Tests | Average |
|---|---|---|---|
| Dillsburg | 17019 | 5,858 | 7.19 |
| Etters | 17319 | 2,905 | 6.69 |
| Manchester | 17345 | 983 | 6.66 |
| Dover | 17315 | 4,041 | 6.38 |
| York Haven | 17370 | 1,034 | 6.21 |
| Wellsville | 17365 | 440 | 5.10 |
Six neighboring areas, all between 5 and 8 pCi/L, against a county average of 10.75. A band that consistent points at the underlying rock across the whole northern part of the county rather than at a quirk in Dover's sample.
Compare that with the southern and eastern edges, where Airville averages 25.06 and Glenville 21.13. The spread across a single county is wide enough that a state map or a county average is close to useless for deciding anything about your own house.
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What mitigation costs in Dover
Forty six systems went in around Dover between 2024 and 2026, at a median of $1,085 and an average of $1,123. Both figures sit slightly under the county median of $1,150, which fits a place where starting levels are lower and standard fans do the job.
The work itself is the same standard sub-slab system used across the county. The modest saving comes from houses needing nothing unusual rather than from local contractors charging less.
Testing matters more here, not less
In a high reading area most people test because they expect a problem. In a lower reading area the expectation runs the other way, and that is exactly where an untested house slips through.
Two details make this sharper in Dover. A summer test reads far lower than a winter one anywhere in York County, by around 80 percent, so a July reading of 3 in a mild area can be over 4 in January. And roughly nine in ten Dover tests were taken in a basement, the highest point in any house, so the number you see is the strongest one your house produces rather than a comfortable one.
How to time and place a test is covered on the page about radon testing in York County.
Common questions about radon in Dover
What is the average radon level in Dover, PA?
The typical Dover result is 3.30 pCi/L, the median across 4,041 recorded tests, below the York County median of 4.30 but above the Pennsylvania median of 2.50. The average is 6.38. Some 44.2 percent of tests still reach the action level.
Is Dover a low radon area?
Lower than most of York County, yes, alongside York Haven and Etters on the northern side. Lower is relative though: the Dover median of 3.30 sits just under the action level, and more than four houses in ten still test at or above it.
How much does radon mitigation cost in Dover?
The median across 46 systems installed since 2024 is $1,085, slightly under the county median of $1,150. The work is the same standard sub-slab system used across York County.
Do I still need to test if Dover reads low?
You still need to test in Dover, because the township average says the geology is milder, not that your house is clear. Individual Dover readings in the state record run from under 1 into double figures.