Listed for: Testing
Verified:Ohio state license
Locations and reports
Radon in Lancaster, Ohio
EPA puts Fairfield County, where Lancaster is, in Zone 1, its highest radon zone, and high results are common there: 76.8% of the 1,175 radon tests reported to CDC (2008 to 2017, laboratory totals) came back at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
76.8%
24.5 pts above OH
- Fairfield
- 76.8%
- Ohio
- 52.3%
Fairfield, 2nd of 79 in OH, 2008 to 2017
Median result
7.4pCi/L
Action level reached
- Fairfield
- 7.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Fairfield's tests, 2008 to 2017
Nearest county
53.3%
Hocking, 17 miles
- Hocking
- 53.3%
- Fairfield
- 76.8%
60 tests, 2008 to 2017
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Fairfield, where Lancaster is
Tests reported
1,175
In Fairfield
- Fairfield
- 1,175
- Hocking
- 60
Reported to CDC before any fix, 2008 to 2017
Read a result for Lancaster
Starts at Fairfield County's median, 7.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 7.4 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Fairfield County's median reported result, 2008 to 2017.
The data
Lancaster, What is published
What is published for Lancaster
Information:
Every figure for Lancaster is a county's
Radon data is published by county, not by city, so for Lancaster it is Fairfield County's: its EPA zone (Zone 1) and the 1,175 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.
Lancaster covers 18.8 square miles of land, all of it in Fairfield County. About 41,956 people live there, 2,226 to the square mile.
Lancaster, Counties
The county Lancaster lies in
MeasuredFairfield County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.
Fairfield CountyZone 1Highest predicted potential
- 76.8%
- Reported tests at or above 4 pCi/L
- 7.4 pCi/L
- Median reported result
- 1,175 tests
- Tests reported to CDC
- None
- Yearly figures on file
Fairfield County ranks 2nd of 79 Ohio counties with 30 or more tests for that period, 24.5 points above the 52.3% pooled across Ohio's counties, 41.1 points above the national pool of 35.7%.
Measured from the middle of Lancaster, the nearest counties with a CDC figure for 2008 to 2017, laboratory are Hocking County (17 miles, 53.3% of 60 tests), Perry County (20 miles, 48.9% of 90 tests) and Pickaway County (23 miles, 81.4% of 183 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 38.1% to 81.4%; the farthest of them, Athens County, is 40 miles away at 38.1%.
The directory lists 1 business with an address in Lancaster, 1 for testing. Ohio's other cities with a page of their own: Columbus, Dayton, Cincinnati and Toledo.
The counties around Lancaster
By distance from the middle of Lancaster; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Lancaster, Geology
The ground under Lancaster
PredictedUSGS's geologic map puts all of Lancaster's mapped land in one class: high radon potential. 96.6% of it lies in the area the map calls Till Plains, to which USGS gives a radon index of 14, in the high band (12 to 17).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Till Plains | Glacial deposits underlain by Ordovician through Devonian limestone and shale. | High | 14 | 96.6% |
| Glaciated Plateau | Pre-Wisconsin glacial deposits derived from high radioactivity marine black shale. | High | 12 | 3.4% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Lancaster beside its county and Ohio
All of Lancaster, like all of Fairfield County, is rated high. Lancaster has more high-potential ground than Ohio as a whole: 100% of its land against 62.8%.
The map rates the ground, not the air in any home.
Lancaster, Homes
Homes in Lancaster
Of Lancaster's 18,153 homes, 68% are detached houses, against 78% across Fairfield County; 13% are in buildings of five or more homes. The homes are older than Fairfield County's as a whole: half were built before 1962 (1983 for Fairfield County), and 48% date from before 1960. 57% of occupied homes are lived in by their owner (Fairfield County: 74%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Lancaster | Fairfield County | Ohio |
|---|---|---|---|
| Housing units | 18,153 | 63,397 | 5,271,573 |
| Detached houses | 68% | 78% | 69% |
| In buildings of 5 or more | 13% | 9% | 15% |
| Mobile homes | 1% | 2% | 4% |
| Built before 1960 | 48% | 26% | 38% |
| Built since 2000 | 14% | 25% | 16% |
| Middle year built | 1962 | 1983 | 1970 |
| Owner-occupied | 57% | 74% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Lancaster, Professionals
Radon professionals listed in Lancaster
Businesses whose listed city is Lancaster, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.
Radon professionals listed in Lancaster: 1 of 1
1 listing with Lancaster as the city. See radon testing in Lancaster, or all radon professionals in Ohio.
Lancaster, Local resources
Local resources for Lancaster
Who to ask in Ohio: its radon program, test kits and professionals.
What it means
Lancaster, Questions
Questions about radon in Lancaster
What radon zone is Lancaster in?
Lancaster takes its zone from Fairfield County, which EPA puts in Zone 1, the map's highest class: a predicted county average above 4 pCi/L.
What are radon levels in Lancaster?
High results are ordinary around Lancaster: 76.8% of the 1,175 tests reported from Fairfield County for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L, the level at which EPA says to fix a home. The median reported result was 7.4 pCi/L.
Should I test my home in Lancaster?
Yes. Fairfield County reported about 902 of its 1,175 tests at or above 4 pCi/L. That is above Ohio's pooled 52.3%, and ranks Fairfield County 2nd of the 79 Ohio counties with 30 or more tests. Which homes they were, no map can say. How to test a home.
What ground is Lancaster built on, as far as radon goes?
USGS's geologic map puts all of Lancaster on one named area, "Till Plains", rated high for radon potential, radon index 14.
Is radon higher in the counties around Lancaster?
It depends which way you go. 1 of the 8 nearest counties with a figure report a larger share than Fairfield County's 76.8% and 7 a smaller one: from Athens County (38.1%, 40 miles off) to Pickaway County (81.4%, 23 miles off).
Who tests for or fixes radon in Lancaster?
Lancaster is the address of one business in Radon411's directory, listed for testing, none for mitigation. Each entry names the public list it came from. Radon professionals in Lancaster.
The answers use the published figures of Fairfield County, the county Lancaster lies in.
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