Radon Mitigation in Codorus Township, PA
Updated
PA DEP has 5,413 home radon tests on record from the ZIP codes that cover Codorus Township (17327, 17362, 17329). 59.6% came back at or above the EPA's 4.0 pCi/L action level, against 52.5% for York County as a whole. That puts Codorus Township clearly above the county as a whole. A standard system here typically costs $800 to $1,500. The only way to know about one house is to test it.
Codorus Township is a township in York County with about 3,943 residents and 1,515 homes, median year built 1975. Jefferson borough is nearly encircled by the township. The S.B. Brodbeck Housing is on the National Register of Historic Places. 59.6% of PA DEP radon tests in its ZIP codes came back at or above the action level, above the county's 52.5%.
What the PA DEP test records show for Codorus Township
ZIP codes don't follow township lines, so the 3 ZIP codes below also take in some homes just outside Codorus Township.
| ZIP | Tests | Median pCi/L | 4+ pCi/L | 10+ | 20+ |
|---|---|---|---|---|---|
| 17327 | 1,797 | 5.9 | 60.8% | 35.6% | 20.6% |
| 17362 | 3,003 | 5.8 | 58.6% | 38% | 22.9% |
| 17329 | 613 | 6.9 | 61.2% | 40.6% | 27.7% |
| York County | 98,845 | 4.3 | 52.5% | 26.8% | 13.1% |
- ZIP 17327 (about 62% of Codorus Township's land): median 5.9 pCi/L across 1,797 tests, 20.6% at 20 or higher, top reading 397. Basement median 6.4, first floor 3.2.
- ZIP 17362 (about 18% of Codorus Township's land): median 5.8 pCi/L across 3,003 tests, 22.9% at 20 or higher, top reading 673. Basement median 7.2, first floor 2.8.
- ZIP 17329 (about 13% of Codorus Township's land): median 6.9 pCi/L across 613 tests, 27.7% at 20 or higher, top reading 455. Basement median 7.7, first floor 3.2.
The spread inside Codorus Township runs from 58.6% of tests high in 17362 to 61.2% in 17329.
Half of the story is the median. The other half is the tail: 37.5% of tests here were 10 pCi/L or higher and 22.7% were 20 or higher. The top reading on record in these ZIP codes is 673 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 17327, basement tests have a median of 6.4 pCi/L, while tests taken on the first floor have a median of 3.2 pCi/L (154 first-floor tests). The basement number runs 2.0 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.
It also explains why two neighbors can get very different results. One tested a finished basement, the other tested a first-floor bedroom. For a decision about mitigation, the test that counts is the one from the lowest level anyone spends time in.
Radon results by decade in ZIP 17327
| Decade tested | Tests | Median pCi/L | 4+ pCi/L |
|---|---|---|---|
| 1990s | 142 | 5.8 | 61.3% |
| 2000s | 499 | 6.4 | 64.3% |
| 2010s | 742 | 5.9 | 61.7% |
| 2020s | 402 | 5 | 54.5% |
The share peaked in the 2000s at 64.3% and sits at 54.5% 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 Codorus Township has not changed. 402 tests have been logged in 17327 since 2020, so people here are still testing.
Housing in Codorus Township and what it means for a system
Census Bureau, American Community Survey 2020 to 2024:
| Codorus Township | York County | |
|---|---|---|
| Homes (housing units) | 1,515 | 189,857 |
| Median year built | 1975 | 1976 |
| Built before 1940 | 24.5% | 18.3% |
| Built before 1980 | 65.3% | 54.8% |
| Built 2000 or later | 9% | 20.6% |
| Single-family detached | 93.8% | 64.3% |
| Attached (rowhome, townhouse) | 2.6% | 17.1% |
| Mobile homes | 3.6% | 4.1% |
| Owner-occupied | 84.5% | 76.3% |
Most of the housing in Codorus Township went up between the 1940s and the 1970s (65.3% was built before 1980, median year 1975). That era mostly means poured or concrete-block basements. Block walls are hollow, and soil gas can move up through the cores, so a system here sometimes needs block-wall suction alongside the usual sub-slab point.
93.8% of homes in Codorus 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, most houses in Codorus Township are the standard $800 to $1,500 sub-slab job, with block walls or a second suction point pushing toward $2,500. Full ranges on the cost page.
Where we work in Codorus Township
The S.B. Brodbeck Housing is on the National Register of Historic Places.
Installers must hold a PA DEP radon mitigation certification (how to check), and permit questions go to the township office at codorustownship.org.
Common questions
Is radon a problem in Codorus Township?
Yes. PA DEP has 5,413 tests on record from the ZIP codes covering Codorus Township, and 59.6% of them came back at or above the EPA's 4.0 pCi/L action level. 22.7% were at 20 pCi/L or more. The county-wide rate is 52.5%.
What is the average radon level in ZIP 17327?
The median of 1,797 PA DEP tests in ZIP 17327 is 5.9 pCi/L and the mean is 15.6 pCi/L. A mean that far above the median means a long tail of very high readings, topping out at 397 pCi/L.
Nearby
Glen Rock 60.8%, Seven Valleys 63.4%, Spring Grove 58.6%, Manheim Township 59.6%, Jefferson 58.6%. Share of PA DEP tests at or above 4.0 pCi/L, against 59.6% here.
Have a test result from Codorus Township?
Send us the number and the foundation type, or call and read it out.
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