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Radon Levels in Muskingum County, Ohio

EPA puts Muskingum County in Zone 1, its highest radon zone, and high results are common there: 56.3% of the 391 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

How to test this homeFind a certified tester

  • Share at 4+ pCi/L

    56.3%

    4.0 pts above OH

    Muskingum
    56.3%
    Ohio
    52.3%

    391 tests, 2008 to 2017

  • Median result

    4.9pCi/L

    Action level reached

    Muskingum
    4.9 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    391

    42nd of 79 by tests

    Muskingum
    391
    Franklin
    16,142

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Ohio

    39 of 79

    Middle half

    Muskingum
    56.3%
    Pickaway
    81.4%

    By share, of 79 with 30+ tests

Read a result for Muskingum County

Starts at Muskingum County's median, 4.9 pCi/L

4.9pCi/L

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

EPA’s reading of 4.9 pCi/L

At or above 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 at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. Muskingum County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Muskingum County, At a glance

Muskingum County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Muskingum County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 71% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Muskingum County, 2008 to 2017, laboratory

Reported results by concentration band, Muskingum County, 2008 to 2017, laboratory
Under 2 pCi/L: 21%2 to 4 pCi/L: 23%4 pCi/L and above: 56%

Of 391 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Muskingum County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L8020.5%
2 to 4 pCi/L9123.3%
4 pCi/L and above22056.3%
What these figures count

These are the 391 tests reported to CDC for Muskingum County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Muskingum County, Compared

Muskingum County radon figures, compared

Calculated by Radon411

More than half: 56.3% of the 391 radon tests reported to CDC for Muskingum County over the 2008 to 2017 laboratory totals read at least 4 pCi/L. That places it 39th of 79 Ohio counties with 30 or more tests for the same period. That is 4.0 points above the 52.3% pooled from 88 Ohio counties.

The median result, 4.9 pCi/L, sits above EPA's 4 pCi/L action level, and the top reported result was 166.8 pCi/L. The rest split 20.5% under 2 pCi/L and 23.3% from 2 to 4 (Ohio: 23.1% and 24.6%). Zone 1 on EPA's map (predicted average above 4 pCi/L) and a 56.3% share point the same way here.

2 of its 5 bordering counties with figures ran higher, led by Licking County at 71.2%; Noble County reported 31.0%. Statewide for the same period, Pickaway County reported the highest share (81.4%) and Cuyahoga County the lowest (21.7%).

CDC's ten-year totals for Muskingum County went from 452 tests (2005 to 2014) to 391 (2008 to 2017), the share going from 53.3% to 56.3%.

Nationally, every county with a figure for the same period pools to 35.7%; Muskingum County sits 20.6 points above it. CDC also counts 56 tests taken after mitigation in Muskingum County for the same period: tests in homes where a fix was already in.

Muskingum County against Ohio, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Muskingum County
Muskingum County39156.3%4.9 pCi/LThis county
Ohio, pooled88 counties, pooled98,84052.3%Not pooled−4.0 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled−20.6 points
Pickaway Countyhighest in the state18381.4%9.5 pCi/L+25.1 points
Cuyahoga Countylowest in the state10,09221.7%2.0 pCi/L−34.6 points
Licking County, OHborders it4,69471.2%7.0 pCi/L+14.9 points
Coshocton County, OHborders it11258.9%5.1 pCi/L+2.6 points
Perry County, OHborders it9048.9%3.8 pCi/L−7.4 points
Guernsey County, OHborders it11744.4%3.6 pCi/L−11.9 points
Noble County, OHborders it4231.0%2.2 pCi/L−25.3 points
Morgan County, OHborders it1030.0%3.3 pCi/L−26.3 points
Where Muskingum County's reported results fell, 2008 to 2017, laboratory, beside Ohio and the United States
ResultMuskingum County testsMuskingum County shareOhio shareU.S. shareAgainst Ohio
Under 2 pCi/L8020.5%23.1%39.6%−2.6 points
2 to 4 pCi/L9123.3%24.6%24.7%−1.3 points
4 pCi/L and above22056.3%52.3%35.7%+4.0 points
Muskingum County ranked among the 79 Ohio counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Mercer County34 of 7914957.7%5.1 pCi/L
Clark County35 of 791,44757.5%4.9 pCi/L
Carroll County36 of 7948657.4%4.8 pCi/L
Allen County37 of 7923856.7%5.0 pCi/L
Highland County38 of 796756.7%4.8 pCi/L
Muskingum County39 of 7939156.3%4.9 pCi/L
Pike County40 of 795756.1%4.5 pCi/L
Erie County41 of 791,65154.5%4.4 pCi/L
Butler County42 of 791,95354.3%4.4 pCi/L
Hocking County43 of 796053.3%4.0 pCi/L
Warren County44 of 792,51252.5%4.2 pCi/L
Muskingum County ten-year laboratory totals, against Ohio's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestOhio, pooledChange from the row before
2008 to 201739156.3%4.9 pCi/L166.8 pCi/L52.3%+1.1 points
2007 to 201642255.2%4.9 pCi/L166.8 pCi/L52.8%+0.2 points
2006 to 201545355.0%4.9 pCi/L166.8 pCi/L52.9%+1.7 points
2005 to 201445253.3%4.4 pCi/L88.2 pCi/L52.4%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Muskingum County, Geology

The ground under Muskingum County

Predicted

USGS's geologic map splits Muskingum County: 71.5% of its land is high radon potential and 28.5% moderate. The map puts 67.3% of Muskingum County in the area it calls Area of Elevated Radioactivity and 28.5% in Unglaciated Plateau, with one smaller area beside them. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 11, in the moderate band (9 to 11).

USGS's geologic areas under Muskingum County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Area of Elevated RadioactivityPennsylvanian shale, sandstone, coal, and limestone.High1267.3%
Unglaciated PlateauMississippian through Permian limestone, dolomite, and shale.Moderate1128.5%
Glaciated PlateauPre-Wisconsin glacial deposits derived from high radioactivity marine black shale.High124.2%

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

Muskingum County beside the ground around it

On high-potential ground Muskingum County is close to Ohio as a whole: 71.5% of its land against 62.8%. Of the 6 counties that border it, 3 have more high-potential ground, Licking County the most at 100%.

Share of land by USGS radon potential: Muskingum County, the 6 counties bordering it and Ohio
AreaEPA zoneLow potentialModerate potentialHigh potential
Muskingum CountyZone 1None28.5%71.5%
Coshocton CountyZone 1NoneNone100%
Guernsey CountyZone 1None14.3%85.7%
Perry CountyZone 1None41.6%58.4%
Licking CountyZone 1NoneNone100%
Noble CountyZone 2None100%None
Morgan CountyZone 2None100%None
Ohio88 counties, pooled by land areaVariesNone37.2%62.8%

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

Local help

Muskingum County, Local resources

Radon testing and mitigation in Muskingum County

Listed radon businesses with an address in Muskingum County:

Listed radon professionals by town: Zanesville, Frazeysburg

What Ohio's program says
Phone
614-728-0272
Email
indoor.radon@odh.ohio.gov
Licensing of radon professionals
This program licenses companies and persons directly involved with the radon testing and mitigation industry.

What it means

Muskingum County, Questions

Questions about radon in Muskingum County

Are radon levels high in Muskingum County?

Over the 2008 to 2017 laboratory totals, 56.3% of the radon tests reported to CDC for Muskingum County, Ohio were at or above 4 pCi/L, and the median reported pre-mitigation result was 4.9 pCi/L. Of 79 Ohio counties with 30 or more tests for the same period, 38 reported a higher share; pooled, the state comes to 52.3%.

Which counties border Muskingum County?

Muskingum County borders 6 counties: Coshocton County, Guernsey County, Perry County, Licking County, Noble County and Morgan County.

Products

Muskingum County, Products

Testing a home in Muskingum County

In Muskingum County, 56.3% of 391 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 52.3% pooled across Ohio. In Zone 1 the year-round level in Muskingum County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Muskingum County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Muskingum County

Explore

Muskingum County, Bordering counties

Counties bordering Muskingum County

Calculated by Radon411

Muskingum County, Cities and towns

Cities and towns in Muskingum County

The Census Bureau estimates 87,014 residents in Muskingum County for July 1, 2025, 565 more than in 2020 (+0.7%). That works out to 131 people per square mile of land. Its largest town, Zanesville, has 25,138 residents, 28.9% of the total. Reported testing is thin here: 391 tests over 2008 to 2017, or 4.5 for every 1,000 residents (2025 estimate), where Ohio as a whole comes to 8.3.

From Zanesville to Norwich, CDC publishes no figure by town: each reads Muskingum County's.

The cities and towns in Muskingum County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Zanesville25,138+1.4%28.9%
New Concord2,473+4.8%2.8%
South Zanesville1,907+0.8%2.2%
Rosevilleextends beyond Muskingum County1,751+0.2%Counted whole
Dresden1,646−0.5%1.9%
Frazeysburg1,356+0.3%1.6%
Philo724+0.4%0.8%
Gratiotextends beyond Muskingum County217+1.4%Counted whole
Adamsville140Level0.2%
Fultonham118Level0.1%
Norwich96−2.0%0.1%

11 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025). A place that extends beyond Muskingum County is counted whole, so it has no share.

Muskingum County, Homes

Homes in Muskingum County

Of Muskingum County's 38,343 homes, 74% are detached houses, against 69% across Ohio; 9% are in buildings of five or more homes. Half of its homes were built before 1972, close to Ohio's 1970: 37% date from before 1960 and 17% from 2000 or later. 69% of occupied homes are lived in by their owner (Ohio: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Muskingum County, Ohio, 2019 to 2023
HomesMuskingum CountyOhio
Housing units38,3435,271,573
Detached houses74%69%
In buildings of 5 or more9%15%
Mobile homes9%4%
Built before 196037%38%
Built since 200017%16%
Middle year built19721970
Owner-occupied69%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.