Radon Mitigation in Shrewsbury, PA
53.5% of 1,635 basement radon tests in Shrewsbury came back at or above 4.0 pCi/L.
Shrewsbury Radon Test Results
Shrewsbury has a small set of tests but a lot of installed systems. Its 1,635 basement tests are among the fewest of the 12 towns, yet 61 systems were installed in the Shrewsbury area from 2022 to 2026, more than every town here except Hanover and Dillsburg. On the test side, 53.5% of results came back at or above 4.0 pCi/L, just under the county's 56.4%, and the median is 4.6 pCi/L, the same as New Freedom. Stewartstown, to the east, reads higher, with a median of 7.2 pCi/L.
DEP files each test under its mailing-address town, so "Shrewsbury" includes the surrounding townships that share that post office. These are tests reported to DEP, not a random sample of homes.
| Area | Basement tests | Median (pCi/L) | % ≥ 4.0 | % ≥ 10 | % ≥ 20 |
|---|---|---|---|---|---|
| Shrewsbury | 1,635 | 4.6 | 53.5% | 26.2% | 11.6% |
| York County | 82,215 | 4.9 | 56.4% | 29.3% | 14.6% |
Source: Pennsylvania DEP, Radon Test Results / Radon Mitigation System records (data.pa.gov). Retrieved October 21, 2026. Tests reported to DEP by certified labs and testers, not a random sample of homes.
What Radon Mitigation Costs in Shrewsbury
The median cost of the 61 radon systems installed in the Shrewsbury area from 2022 to 2026 was $1,065. Across York County, the median was $1,150 for 749 systems from 2024 to 2026. With 61 systems behind it, Shrewsbury's median is a solid town figure.
By system type, from 2024 to 2026 a standard sub-slab system had a county median cost of $1,175 (599 systems), and activating an existing passive pipe $775 (141 systems). 50.9% of county jobs cost between $935 and $1,320. We confirm your price in writing after a free inspection.
Basement vs First Floor
Radon is usually highest at the lowest level of a house. In York County, basement tests have a median of 4.9 pCi/L and first-floor tests 2.1 pCi/L, with 33.4% of first-floor tests at or above 4.0. Shrewsbury's basement median of 4.6 pCi/L is at or below the county's, but a low first-floor reading does not clear the basement. Test the lowest level you use.
| York County test level | Tests | Median (pCi/L) | % ≥ 4.0 |
|---|---|---|---|
| Basement | 82,215 | 4.9 | 56.4% |
| First floor | 10,703 | 2.1 | 33.4% |
Source: Pennsylvania DEP, Radon Test Results / Radon Mitigation System records (data.pa.gov). Retrieved October 21, 2026. Tests reported to DEP by certified labs and testers, not a random sample of homes.
How a Radon System Works in Shrewsbury Homes
Most systems in York County are active sub-slab depressurization. Our crew seals the sump and major cracks, cuts a suction point through the basement floor, and runs a sealed pipe to a fan mounted outside the living space. The fan keeps the soil under the house at lower pressure than the rooms above, so radon is drawn into the pipe and vented above the roofline instead of seeping indoors. A gauge on the pipe shows the fan is pulling. Across the county, the median reading was 12.0 pCi/L before mitigation and 1.0 pCi/L after, and 97.5% of systems tested below 4.0 pCi/L afterward. In Shrewsbury, every system we install gets a follow-up test so you see your own before and after.
Check Any Radon Mitigator's Certification in Shrewsbury
Pennsylvania requires anyone who tests for radon or installs a mitigation system for hire to be certified by the Department of Environmental Protection. We hold that certification, and we welcome the same checks. Before you hire anyone in Shrewsbury, including us:
- Ask for the DEP certification number of the person and the firm, then check it in the PA DEP Radon Services Directory (opens in a new tab), which DEP updates monthly by county.
- Get the scope and price in writing.
- Ask for proof of liability insurance and a Pennsylvania home improvement contractor registration.
- Ask for a follow-up test after the fan runs.
How We Handle Radon Mitigation in Shrewsbury
We are a PA DEP-certified radon mitigation firm. Our own crew does every job.
- 1 Step 1
You send your result
Your ZIP code and radon result, if you have one. The estimate is free.
- 2 Step 2
We inspect and quote
We check the foundation and put the design and price in writing.
- 3 Step 3
Our crew installs
Our certified crew seals the slab, runs the pipe and mounts the fan.
- 4 Step 4
We retest
A follow-up test puts your new level on paper.
Radon Services We Provide in Shrewsbury
Our PA DEP-certified crew tests, installs, repairs and services radon systems in Shrewsbury homes. Pick a service to see the work and the price range.
Radon FAQs for Shrewsbury
875 of 1,635 basement tests (53.5%) were at or above 4.0 pCi/L, and 429 (26.2%) were at or above 10.
The median cost of 61 systems from 2022 to 2026 was $1,065, below the county median of $1,150 for 2024 to 2026.
Activating a passive system usually costs less than a new install. The county median for that job was $775 across 141 systems from 2024 to 2026, against $1,175 for a standard sub-slab system.
Glen Rock reads higher: 63.4% of its tests were at or above 4.0 pCi/L, against 53.5% in Shrewsbury.
Sources
- Pennsylvania DEP, Radon Test Results, September 1986 to Current (data.pa.gov)
- Pennsylvania DEP, Radon Mitigation System Year, 1987 to Current (data.pa.gov)
- U.S. EPA, Health Risk of Radon
- U.S. EPA, Consumer's Guide to Radon Reduction
- Pennsylvania Code, 25 Pa. Code Chapter 240, Radon Certification
- Pennsylvania DEP, Radon Services Directory (certified testers, mitigators and labs by county)
Data retrieved October 21, 2026. Links, dates and methods for every source are on our sources and resources page.