What are average radon levels in Newnan, Georgia?

Average radon levels in Newnan and Coweta County range from 2.0 to 4.0 pCi/L. Coweta County is classified as EPA Zone 2 (moderate risk), and approximately 15-25% of tested homes exceed the EPA action level of 4 pCi/L. Homes in northern Coweta County, closer to the Piedmont bedrock, tend to have higher readings.

How much does radon mitigation cost in Newnan?

Radon mitigation in Newnan costs $1,200 to $2,500 for slab or basement homes using sub-slab depressurization. Crawl space homes require sub-membrane systems costing $2,500 to $5,000. Both systems are typically installed in one day and achieve 90-99% radon reduction.

Should I test a newer home in Newnan for radon?

Yes. New construction sits on the same geology as older homes, and Georgia does not require radon-resistant features in new residential construction. Modern energy-efficient homes are actually built tighter, which can trap more radon indoors. The EPA recommends testing every home regardless of age.

Does Newnan's historic district have higher radon risk?

Older homes in Newnan's historic district may have more pathways for radon entry due to aging foundations, crawl spaces with exposed soil, and more cracks in older construction materials. However, radon risk is primarily determined by the geology beneath a specific property. Testing is the only way to know your actual level.

Radon in Newnan, Georgia: Coweta County Radon Guide

Q: Is northern Coweta County higher risk than southern Coweta?

Generally yes. Northern Coweta County, including Newnan, sits more firmly on Piedmont metamorphic rock that produces radon. Southern Coweta County begins transitioning toward Coastal Plain geology with sandier soils where radon tends to dissipate more easily. However, individual home testing is still necessary regardless of location within the county.

1. Why Newnan Has Radon Risk

Newnan sits on the Piedmont geological province in the southwestern arc of Metro Atlanta. The bedrock beneath Coweta County includes biotite gneiss, granite, and other metamorphic formations that contain trace amounts of uranium. Through natural radioactive decay, this uranium produces radon gas, which moves upward through soil fractures and enters homes through foundation openings.

Coweta County is classified as EPA Zone 2 (moderate risk), with predicted average indoor radon levels between 2 and 4 pCi/L. Testing data shows that approximately 15-25% of homes in the Newnan area exceed the EPA action level of 4 pCi/L. The percentage is somewhat higher in the northern parts of the county and lower toward the south, where the geology transitions to Coastal Plain sediments.

Coweta County has experienced substantial growth, with the population exceeding 150,000. Subdivisions are being developed across the county, and each new home sits on the same bedrock that has been producing radon for millions of years. Testing every home, new or old, is the only way to identify the risk.

2. Newnan Neighborhoods and Radon

Different parts of Newnan have different housing characteristics and radon risk profiles:

Downtown Newnan historic district. Beautiful antebellum and Victorian homes line the streets near the courthouse square. Many of these homes have crawl space or pier foundations with aging materials. Older foundations have more cracks, gaps, and settling that create easy pathways for radon entry.

Summergrove and Ashley Park. Large master-planned communities with modern construction. These homes are primarily slab-on-grade with tight building envelopes. While the foundation type limits some radon entry, the energy-efficient construction can trap more radon inside compared to drafty older homes.

North Newnan and Sharpsburg area. This part of Coweta County sits on more prominent Piedmont geology with rolling terrain. Many homes have walk-out basements or lower levels built into hillsides, providing significant below-grade soil contact and higher radon entry potential.

Senoia and southern Coweta. The southern portions of the county begin transitioning toward Coastal Plain geology with sandier soils. Radon levels tend to be somewhat lower here, though individual homes can still test above the action level depending on specific site conditions.

Use our see your area's radon data to check local radon risk.

For broader county-level data, see our Fayette County radon guide.

3. Foundation Types in Coweta County

Your foundation type determines how radon enters and how mitigation is designed:

Crawl spaces. Common in older Newnan homes. Crawl spaces with exposed soil floors are the most problematic because radon can freely enter the space beneath the home. Even encapsulated crawl spaces need proper radon barriers and may require active depressurization to keep levels safe.

Slab-on-grade. The standard in newer construction. Radon enters through cracks, the slab-wall joint, expansion joints, and utility penetrations. Even a new slab develops micro-cracks as concrete cures and the soil settles beneath it.

Basements and walk-outs. Found on sloped lots, particularly in northern Coweta County. Basements have the most soil contact and highest radon accumulation potential. The wall-floor joint, floor cracks, sump pits, and utility penetrations are all entry points.

Crawl Space Homes Need Special Attention

Newnan has many older homes with crawl space foundations. If your crawl space has exposed dirt, radon gas has an unrestricted path into the space beneath your home. Crawl space encapsulation combined with radon mitigation addresses both radon and moisture concerns.

4. Testing Your Newnan Home

Radon testing is the only way to know your home's level. Here is the process: Neighboring cities like Peachtree City, McDonough, and Stockbridge show similar radon patterns due to shared geology.

Select a Test

Professional CRM testing ($125-250) provides 48 hours of hourly radon data and is the standard for real estate transactions. DIY kits ($15-40 plus lab fees) work for initial screening.

Position the Test

Place in the lowest livable area. Keep away from windows, exterior walls, and drafts. Maintain closed-house conditions with normal HVAC operation during the test.

Read Your Results

Below 2 pCi/L: Low risk. Between 2-4 pCi/L: Consider long-term follow-up. Above 4 pCi/L: have your radon levels lowered. Above 8 pCi/L: Act quickly.

5. Mitigation Options and Costs

If your Newnan home tests above 4 pCi/L, a mitigation system will bring levels down effectively:

Slab or Basement

$1,200-$2,500

Sub-slab depressurization: a suction point through the slab connected to PVC piping and a radon fan exhausting above the roofline.

Crawl Space

$2,500-$5,000

Sub-membrane depressurization: a sealed vapor barrier over the soil with active suction pulling radon from beneath the crawl space.

Both systems achieve 90-99% radon reduction and are installed in a single day. Use our radon system cost calculator for a personalized quote.

For more information, read our first-time homebuyer radon checklist. The only way to know is to set up a professional radon test.

Newnan and Coweta County Homeowners

With Coweta County's moderate radon risk, 15-25% of homes test above the action level. A simple 48-hour test removes the guesswork, and mitigation, if needed, is a one-day fix that protects your family permanently.

Radon in Newnan, Georgia: Coweta County Radon Guide

1. Why Newnan Has Radon Risk

2. Newnan Neighborhoods and Radon