Smithfield, NC Radon Mitigation and Testing

Q: What EPA Radon Zone is Smithfield in?

Smithfield is in Johnston County, EPA Zone 3.

Q: How much does radon mitigation cost in Smithfield?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Johnston County

EPA Zone 3

Located in Johnston County within the Raleigh Metro area, Smithfield sits on Coastal Plain sediments and Triassic basin formations that generally produce lower radon potential across eastern North Carolina. The community has experienced significant growth with newer subdivisions complementing historic downtown areas, featuring a mix of slab-on-grade and crawl space construction. Although testing data is limited for zip code 27577, homeowners may still want to establish baseline radon levels through professional testing in this EPA Zone 3 area.

Smithfield, NC Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Smithfield, NC Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Smithfield Radon Facts

Key details about the radon risk profile for Smithfield and the 27577 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Johnston County, NC

Zip Code

27577

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Smithfield and the 27577 zip code are located in Johnston County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Smithfield, NC

What EPA Radon Zone is Smithfield in?

Smithfield and the 27577 zip code are in Johnston County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

How much does radon mitigation cost in Smithfield?

Radon mitigation in Smithfield typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Smithfield?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Most Active Radon Markets in North Carolina

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Murphy	12.83 pCi/L	6
Blowing Rock	10.17 pCi/L	6
Brevard	7.50 pCi/L	4
Cary	5.00 pCi/L	4
Highlands	4.50 pCi/L	4
Mooresville	4.00 pCi/L	4
Banner Elk	9.33 pCi/L	3
Charlotte	7.33 pCi/L	3
Denver	4.33 pCi/L	3
Hendersonville	9.00 pCi/L	2
Wake Forest	4.50 pCi/L	2
Apex	3.50 pCi/L	2
Huntersville	3.50 pCi/L	2
Raleigh	9.00 pCi/L	1
Fayetteville	5.00 pCi/L	1
Waxhaw	4.00 pCi/L	1
Chapel Hill	3.00 pCi/L	1
Clayton	No submissions	0
Fuquay Varina	No submissions	0
Holly Springs	No submissions	0