Skip to content
RADON411

Locations and reports

Radon in Parma, Ohio

EPA puts Cuyahoga County, where Parma is, in Zone 2, its middle radon zone, and 21.7% of its 10,092 reported radon tests (2008 to 2017, laboratory totals) 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    21.7%

    30.6 pts below OH

    Cuyahoga
    21.7%
    Ohio
    52.3%

    Cuyahoga, 79th of 79 in OH, 2008 to 2017

  • Median result

    2.0pCi/L

    Below action level

    Cuyahoga
    2.0 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of Cuyahoga's tests, 2008 to 2017

  • Nearest county

    43.4%

    Medina, 20 miles

    Medina
    43.4%
    Cuyahoga
    21.7%

    2,139 tests, 2008 to 2017

  • EPA radon zone

    Zone 2

    Moderate potential

    1. 1
    2. Zone 2
    3. 3

    1 highest, 3 lowest

    Cuyahoga, where Parma is

  • Tests reported

    10,092

    In Cuyahoga

    Cuyahoga
    10,092
    Medina
    2,139

    Reported to CDC before any fix, 2008 to 2017

Read a result for Parma

Starts at Cuyahoga County's median, 2.0 pCi/L

2.0pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 2.0 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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. Cuyahoga County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Parma, What is published

What is published for Parma

Information:

Every figure for Parma is a county's

Radon data is published by county, not by city, so for Parma it is Cuyahoga County's: its EPA zone (Zone 2) and the 10,092 tests reported to CDC for 2008 to 2017, laboratory. Only a test tells you about one home.

Parma covers 20 square miles of land, all of it in Cuyahoga County. About 78,581 people live there, 3,925 to the square mile.

Parma, Counties

The county Parma lies in

Measured

Cuyahoga County's EPA zone and the figures CDC publishes for it, 2008 to 2017, laboratory.

Cuyahoga CountyZone 2Moderate predicted potential

21.7%
Reported tests at or above 4 pCi/L
2.0 pCi/L
Median reported result
10,092 tests
Tests reported to CDC
None
Yearly figures on file

Cuyahoga County ranks 79th of 79 Ohio counties with 30 or more tests for that period, 30.6 points below the 52.3% pooled across Ohio's counties, 14.0 points below the national pool of 35.7%.

Measured from the middle of Parma, the nearest counties with a CDC figure for 2008 to 2017, laboratory are Medina County (20 miles, 43.4% of 2,139 tests), Summit County (21 miles, 38.7% of 6,486 tests) and Lorain County (23 miles, 45.4% of 3,307 tests). Across the 8 nearest, the share at or above 4 pCi/L runs from 23.4% to 61.8%; the farthest of them, Stark County, is 44 miles away at 60.1%.

The directory lists 1 business with an address in Parma, 1 for testing. Ohio's other cities with a page of their own: Columbus, Dayton, Cincinnati and Toledo.

The counties around Parma

By distance from the middle of Parma; counties with 30 or more tests.

Nearest counties to Parma with 30 or more tests
CountyDistanceTestsAt or above 4 pCi/LMedian
Medina County20 mi2,13943.4%3.5 pCi/L
Summit County21 mi6,48638.7%3.1 pCi/L
Lorain County23 mi3,30745.4%3.6 pCi/L
Geauga County30 mi1,46923.4%2.4 pCi/L
Portage County31 mi1,66139.3%3.2 pCi/L
Lake County33 mi2,34927.2%2.4 pCi/L
Wayne County39 mi1,07461.8%4.9 pCi/L
Stark County44 mi3,31760.1%4.9 pCi/L

Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.

Parma, Geology

The ground under Parma

Predicted

USGS's geologic map puts all of Parma's mapped land in one class: moderate radon potential. All of it lies in the area the map calls Glaciated Plateau, to which USGS gives a radon index of 11, in the moderate band (9 to 11).

USGS's geologic areas under Parma
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Glaciated PlateauDevonian, Mississippian and Permian carbonates and shales.Moderate11100%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Parma beside its county and Ohio

The ground under Parma is close to Cuyahoga County's as a whole: 100% rated moderate against 99.9%. Across Ohio 62.8% of the land is rated high; none of Parma's is.

Share of land by USGS radon potential: Parma, the county it lies in and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
ParmaBy countyNone100%None
Cuyahoga CountyZone 2None99.9%None
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

The map rates the ground, not the air in any home.

Parma, Homes

Homes in Parma

Parma is a place of houses on their own lots: 78% of its 36,478 homes are detached single-family houses, against 59% across Cuyahoga County. Half of its homes were built before 1958, close to Cuyahoga County's 1957: 59% date from before 1960 and 3% from 2000 or later. 73% of occupied homes are lived in by their owner (Cuyahoga County: 59%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Parma, Cuyahoga County, Ohio, 2019 to 2023
HomesParmaCuyahoga CountyOhio
Housing units36,478615,5135,271,573
Detached houses78%59%69%
In buildings of 5 or more15%24%15%
Mobile homesunder 1%1%4%
Built before 196059%57%38%
Built since 20003%7%16%
Middle year built195819571970
Owner-occupied73%59%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

Parma, Professionals

Radon professionals listed in Parma

Businesses whose listed city is Parma, from the state registries and listings in the Radon411 directory, with the same business and certification status the directory shows.

1 listing with Parma as the city. See radon testing in Parma, or all radon professionals in Ohio.

Parma, Local resources

Local resources for Parma

Who to ask in Ohio: its radon program, test kits and professionals.

The program's own words on licensing are on the Ohio page.

What it means

Parma, Questions

Questions about radon in Parma

What radon zone is Parma in?

Parma has no zone of its own: it shares Cuyahoga County's, Zone 2, the map's middle class: a predicted county average of 2 to 4 pCi/L.

What are radon levels in Parma?

Most tests near Parma come back under EPA's action level, but not all: 21.7% of Cuyahoga County's 10,092 tests for 2008 to 2017 (laboratory totals) were at or above 4 pCi/L. The median reported result was 2.0 pCi/L.

Should I test my home in Parma?

Yes. In Cuyahoga County, about one reported test in 5 reached 4 pCi/L. That is below Ohio's pooled 52.3%, and still not a reason to skip it, and ranks Cuyahoga County 79th of the 79 Ohio counties with 30 or more tests. The number for one house comes only from testing it. How to test a home.

What ground is Parma built on, as far as radon goes?

USGS's geologic map puts all of Parma on one named area, "Glaciated Plateau", rated moderate for radon potential, radon index 11.

Is radon higher in the counties around Parma?

Higher, in every direction measured: all 8 of the nearest counties with a figure report a larger share of high tests than Cuyahoga County's 21.7%, up to Wayne County (61.8%, 39 miles off).

Who tests for or fixes radon in Parma?

Parma 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 Parma.

The answers use the published figures of Cuyahoga County, the county Parma lies in.

Explore