Is radon high in Horry County, South Carolina?

Low. The model predicts a long-term basement average of 1.3 pCi/L in Horry County (about 27% below the US average of 1.8 and about 19% below the South Carolina average of 1.6). That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Ranked 45 of 46 South Carolina counties.

Should I test for radon in Horry County?

Yes, once. The EPA recommends testing every home regardless of area, and the model's ZIP-level predictions in Horry County already range from 1.1 to 1.5 pCi/L. A short-term kit costs little and settles the question for your house.

What does EPA Radon Zone 3 mean for Horry County?

Zone 3 - low potential (< 2 pCi/L). The zone map dates from 1993 and classifies whole counties. The 2001-2021 model agrees with the zone here. Neither replaces a test of your own home.

How much does radon mitigation cost in Horry County?

A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; South Carolina quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

Radon levels in Horry County, South Carolina

LowEPA Zone 3

Predicted long-term basement average of 1.3 pCi/L (model estimate) across 16 ZIP codes - about 27% below the US average of 1.8, about 19% below the South Carolina average of 1.6. Ranked #45 of 46 South Carolina counties.

Test Horry County, SC once anyway - radon varies house to house

The predicted basement average here is 1.3 pCi/L, below the EPA's 2 pCi/L "consider fixing" threshold. That's good news for the area - but the EPA still recommends every home be tested, because foundation cracks, soil pockets and ventilation make one house very different from its neighbor. One inexpensive kit settles it.

Get a short-term test kit →Or track it with a continuous monitor

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Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.

1.3 ± 0.07

pCi/L predicted basement mean (model SD)

0.6 ± 0.08

pCi/L predicted upstairs (above-ground) mean

1.1-1.5

range of ZIP-level basement predictions in the county

What this means for Horry

The typical Horry County home is predicted below 2 pCi/L, the lowest band. That is the best case an area can show - but it describes the average house, and the ZIP-level predictions within the county still span 1.1 to 1.5 pCi/L.

The 1993 EPA zone (3) and the 2001-2021 model agree for Horry. County figures weight each ZIP by its 2010 Census population, so they describe where people live rather than empty land.

Comparable South Carolina counties: Richland County (1.3), Charleston County (1.3), Colleton County (1.3), Jasper County (1.3). The state's highest is Oconee County at 2.5 pCi/L.

ZIP codes in Horry County

Predicted basement and upstairs means by ZIP (model estimate). ZIPs whose land is mostly in this county.

ZIP	Basement	Upstairs	Grade
29526	1.4 ± 0.06	0.6	Low
29588	1.3 ± 0.06	0.6	Low
29579	1.4 ± 0.07	0.6	Low
29577	1.1 ± 0.08	0.5	Low
29576	1.4 ± 0.07	0.6	Low
29527	1.3 ± 0.07	0.6	Low
29569	1.3 ± 0.07	0.7	Low
29575	1.2 ± 0.07	0.6	Low
29566	1.3 ± 0.07	0.7	Low
29582	1.3 ± 0.06	0.6	Low
29568	1.3 ± 0.07	0.6	Low
29572	1.3 ± 0.07	0.7	Low
29511	1.5 ± 0.07	0.9	Low
29544	1.3 ± 0.07	0.8	Low
29581	1.3 ± 0.07	0.7	Low
29545	1.4 ± 0.07	0.9	Low

If your test comes back at 4 pCi/L or higher

Mitigation is a routine job: a fan-driven pipe that vents soil gas from under the slab to above the roofline, typically $800-$2,500 installed (typical range; local quotes vary). Use certified professionals: EPA find-a-professional. Read the full mitigation guide.

Horry County radon questions

Is radon high in Horry County, South Carolina?: Low. The model predicts a long-term basement average of 1.3 pCi/L in Horry County (about 27% below the US average of 1.8 and about 19% below the South Carolina average of 1.6). That is below the EPA's 2 pCi/L "consider fixing" threshold, though individual homes still vary. Ranked 45 of 46 South Carolina counties.
Should I test for radon in Horry County?: Yes, once. The EPA recommends testing every home regardless of area, and the model's ZIP-level predictions in Horry County already range from 1.1 to 1.5 pCi/L. A short-term kit costs little and settles the question for your house.
What does EPA Radon Zone 3 mean for Horry County?: Zone 3 - low potential (< 2 pCi/L). The zone map dates from 1993 and classifies whole counties. The 2001-2021 model agrees with the zone here. Neither replaces a test of your own home.
How much does radon mitigation cost in Horry County?: A standard active sub-slab depressurization system typically runs $800-$2,500 installed nationally; South Carolina quotes vary with foundation type (slab, crawlspace, basement), home size and local labor. Get two or three bids from certified mitigators listed by your state radon program or the EPA's find-a-professional page.

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