Locations and reports
Radon in Greensburg, Pennsylvania
EPA puts Westmoreland County, where Greensburg is, in Zone 1, its highest radon zone, and 34.9% of its 1,588 reported radon tests (2020) were 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
34.9%
4.6 pts above PA
- Westmoreland
- 34.9%
- PA
- 30.3%
Westmoreland, 40th of 63 in PA, 2020
Median result
2.6pCi/L
Below action level
- Westmoreland
- 2.6 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of Westmoreland's tests, 2020
Nearest county
30.5%
Allegheny, 25 miles
- Allegheny
- 30.5%
- Westmoreland
- 34.9%
8,337 tests, 2020
EPA radon zone
Zone 1
Highest potential
- Zone 1
- 2
- 3
1 highest, 3 lowest
Westmoreland, where Greensburg is
Tests reported
1,588
In Westmoreland
- Westmoreland
- 1,588
- Allegheny
- 8,337
Reported to CDC before any fix, 2020
Read a result for Greensburg
Starts at Westmoreland County's median, 2.6 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 2.6 pCi/L
Between 2 and 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Westmoreland County's median reported result, 2020.
The data
Greensburg, What is published
What is published for Greensburg
Every figure for Greensburg is a county's
Radon data is published by county, not by city, so for Greensburg it is Westmoreland County's: its EPA zone (Zone 1) and the 1,588 tests reported to CDC for 2020. Only a test tells you about one home.
Greensburg covers 4.1 square miles of land, all of it in Westmoreland County. About 14,462 people live there, 3,566 to the square mile.
Greensburg, Counties
The county Greensburg lies in
MeasuredWestmoreland County's EPA zone and the figures CDC publishes for it, 2020.
Westmoreland CountyZone 1Highest predicted potential
- 34.9%
- Reported tests at or above 4 pCi/L
- 2.6 pCi/L
- Median reported result
- 1,588 tests
- Tests reported to CDC
- 7
- Annual years on file
Westmoreland County ranks 40th of 63 Pennsylvania counties with 30 or more tests for that period, 4.6 points above the 30.3% pooled across Pennsylvania's counties, 9.4 points above the national pool of 25.5%.
The counties nearest Greensburg with a CDC figure for 2020, measured from the middle of the city: Allegheny County (25 miles, 30.5% of 8,337 tests), Fayette County (28 miles, 17.4% of 287 tests) and Indiana County (34 miles, 44.3% of 228 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 17.4% to 47.6%; the farthest of them, Butler County, is 46 miles away at 42.3%.
No business in the directory gives Greensburg as its address; the Pennsylvania list covers it. Pennsylvania's other cities with a page of their own: Pittsburgh, Allentown, Scranton and Harrisburg.
The counties around Greensburg
By distance from the middle of Greensburg; counties with 30 or more tests.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2020.
Greensburg, Geology
The ground under Greensburg
PredictedUSGS's geologic map puts all of Greensburg's mapped land in one class: high radon potential. All of it lies in the area the map calls Pennsylvanian Rocks of the Pittsburgh Low Plateau, 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 |
|---|---|---|---|---|
| Pennsylvanian Rocks of the Pittsburgh Low Plateau | Pennsylvanian marine shale, siltstone, sandstone, limestone, and coal. | High | 14 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Greensburg beside its county and Pennsylvania
Greensburg sits on more high-potential ground than Westmoreland County as a whole: 100% of the city against 65.4% of the county. Greensburg has more high-potential ground than Pennsylvania as a whole: 100% of its land against 70.4%.
The map rates the ground, not the air in any home.
Greensburg, Homes
Homes in Greensburg
Of Greensburg's 7,204 homes, 55% are detached houses, against 77% across Westmoreland County; 25% are in buildings of five or more homes. Half of its homes were built before 1959, close to Westmoreland County's 1964: 52% date from before 1960 and 4% from 2000 or later. 54% of occupied homes are lived in by their owner (Westmoreland County: 78%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Greensburg | Westmoreland County | Pennsylvania |
|---|---|---|---|
| Housing units | 7,204 | 168,406 | 5,779,663 |
| Detached houses | 55% | 77% | 57% |
| In buildings of 5 or more | 25% | 7% | 13% |
| Mobile homes | under 1% | 5% | 4% |
| Built before 1960 | 52% | 45% | 45% |
| Built since 2000 | 4% | 11% | 14% |
| Middle year built | 1959 | 1964 | 1965 |
| Owner-occupied | 54% | 78% | 69% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.
Local help
Greensburg, Local resources
Local resources for Greensburg
Who to ask in Pennsylvania: its radon program, test kits and professionals.
- Radon DivisionRun by Department of Environmental Protection, phone 800-237-2366.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Through an EPA-funded program, hospitals give parents of newborn children a packet of information which includes a coupon for a free radon test kit from the DEP.
- Compare kits
- Professionals in PennsylvaniaRadon testers and mitigators in Pennsylvania, each with how its listing was checked.
The program's own words on licensing are on the Pennsylvania page.
What it means
Greensburg, Questions
Questions about radon in Greensburg
What radon zone is Greensburg in?
EPA's map puts Westmoreland County, and with it Greensburg, in Zone 1, the map's highest class: a predicted county average above 4 pCi/L.
What are radon levels in Greensburg?
A high result is no surprise around Greensburg: 34.9% of 1,588 tests reported from Westmoreland County for 2020 reached 4 pCi/L or more. The median reported result was 2.6 pCi/L.
Should I test my home in Greensburg?
Yes. About 554 of the 1,588 tests reported from Westmoreland County were at or above 4 pCi/L. That is above Pennsylvania's pooled 30.3%, and ranks Westmoreland County 40th of the 63 Pennsylvania counties with 30 or more tests. No map says which homes those are. How to test a home.
What ground is Greensburg built on, as far as radon goes?
USGS's geologic map puts all of Greensburg on one named area, "Pennsylvanian Rocks of the Pittsburgh Low Plateau", rated high for radon potential, radon index 14.
Is radon higher in the counties around Greensburg?
Some are and some are not. Against Westmoreland County's 34.9%, 5 of the 8 nearest counties with a figure report more and 3 less, from Fayette County (17.4%, 28 miles off) to Armstrong County (47.6%, 35 miles off).
The answers use the published figures of Westmoreland County, the county Greensburg lies in.
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