What are average radon levels in Acworth, Georgia?

Average radon levels in Acworth range from 3.5 to 6.0 pCi/L based on local testing data. Acworth straddles Cobb and Cherokee counties, both classified as EPA Zone 1 (highest risk). About 25-38% of tested homes exceed the EPA action level of 4 pCi/L.

Is Acworth in a high radon zone?

Yes. Acworth sits in two Zone 1 counties (Cobb and Cherokee), which is the EPA's highest risk designation. Both counties have predicted average indoor radon levels above 4 pCi/L. The Piedmont granite beneath Acworth is particularly productive for radon gas.

How much does radon mitigation cost in Acworth?

Radon mitigation in Acworth typically costs $1,200 to $2,500 for slab or basement homes. Crawl space homes cost $2,500 to $5,000 due to vapor barrier requirements. Both systems reduce radon by 90-99% and are installed in a single day.

Does living near Lake Acworth or Lake Allatoona affect radon levels?

The lakes themselves do not produce radon, but the rocky terrain surrounding them is part of the same Piedmont geology that generates radon. Homes near the lakes built on slopes with walkout basements or on exposed rock may have elevated radon due to bedrock proximity. The water table near the lakes does not directly affect indoor radon levels.

Radon in Acworth, Georgia: Local Data and What to Do

1. Why Acworth Has High Radon Risk

Acworth sits at the northern edge of Cobb County and extends into Cherokee County. Both counties are classified by the EPA as Zone 1, the highest radon risk designation. The bedrock beneath Acworth is Piedmont granite and gneiss, rich in uranium that decays into radon gas. The gas migrates through soil and enters homes through foundation openings.

The terrain around Acworth is hilly, especially near Lake Acworth and Lake Allatoona. This terrain means many homes are built with walkout basements, full basements, or crawl spaces that follow the natural grade. These below-grade spaces put living areas closer to the radon source and tend to accumulate higher levels than main-floor rooms.

Acworth's housing stock spans from historic homes near downtown to large subdivisions built in the 2000s and 2010s. Regardless of age, all homes in Acworth sit on the same high-risk geology. The only way to know your home's radon level is to have your home tested for radon.

2. EPA Zone Designation for Acworth

Acworth spans two counties, both classified as EPA Zone 1. Cobb County and Cherokee County share this highest-risk designation, with predicted average indoor radon levels above 4 pCi/L. This makes Acworth one of the few cities in Metro Atlanta that sits entirely within Zone 1 territory.

Zone	Predicted Avg	Risk Level
Zone 1 (Cobb & Cherokee / Acworth)	Above 4 pCi/L	High
Zone 2 (Moderate)	2-4 pCi/L	Moderate
Zone 3 (Lowest)	Below 2 pCi/L	Low

Dual Zone 1 Counties Mean High Priority

Acworth is unique in sitting across two Zone 1 counties. The EPA recommends testing every home in Zone 1 areas. With local averages of 3.5-6.0 pCi/L and over a quarter of tested homes exceeding the action level, radon testing in Acworth is not optional, it is essential.

3. Neighborhoods with Higher Radon Potential

All Acworth homes should be tested, but certain areas show patterns of elevated readings:

Lake Acworth area. Homes near Lake Acworth sit on rocky terrain with granite close to the surface. The hilly lots mean many homes have walkout basements with large below-grade wall areas. The combination of shallow bedrock and deep foundations creates conditions where radon accumulates readily.

Mars Hill Road corridor. Subdivisions along Mars Hill Road feature homes from the 1990s and 2000s with full basements. The consistent granite geology along this corridor means elevated radon results are common. Tested results between 4 and 8 pCi/L are not unusual.

Historic downtown Acworth. Older homes near downtown feature a range of foundation types including stone, block, and crawl space foundations. These older foundations may have more settling and cracking that provides additional radon entry points.

Baker Road/Cherokee County side. The Cherokee County portion of Acworth sits on similarly productive geology. Newer subdivisions in this area feature homes with modern construction, but the underlying geology still produces radon at significant levels.

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

Use our check your zip code's radon risk to check the risk level for your Acworth zip code.

4. Local Testing Data and Trends

Testing data from radon professionals working in Acworth shows these patterns: Neighboring cities like Kennesaw, Woodstock, and Powder Springs show similar radon patterns due to shared geology.

Average test results in Acworth range from 3.5 to 6.0 pCi/L, consistent with the Zone 1 designation.

Approximately 25-38% of tested homes exceed the EPA action level of 4 pCi/L.

Basement homes test 30-50% higher than slab homes. Homes near the lakes with walkout basements tend to produce the highest readings.

Winter testing produces results 40-60% higher than summer testing.

Acworth's growing real estate market makes radon testing during home purchases particularly important in this Zone 1 area. See our home inspection radon guide for details.

5. How to Test Your Acworth Home

Testing is straightforward. Here is the recommended approach:

Choose Your Test Type

A short-term test (minimum 48 hours) gives a quick snapshot. Professional CRM testing is standard for real estate. DIY charcoal kits cost $15-40 plus lab fees.

Place the Test Correctly

Test in the lowest livable level. For basement homes, test in the basement. For slab or crawl space homes, test on the main floor. Keep the device away from windows and exterior walls. Maintain closed-house conditions.

Interpret Your Results

Below 2 pCi/L: Low risk, retest every 2 years. Between 2-4 pCi/L: Consider follow-up testing or mitigation. Above 4 pCi/L: The EPA recommends professional radon mitigation. Above 8 pCi/L: Prioritize mitigation promptly.

6. Mitigation Options for Acworth Homes

If your Acworth home tests above 4 pCi/L, mitigation is effective and straightforward:

Slab or Basement

$1,200-$2,500

Sub-slab depressurization: a suction point drilled through the foundation, connected to PVC pipe and a fan that vents radon above the roofline.

Crawl Space

$2,500-$5,000

Sub-membrane depressurization: a sealed vapor barrier over exposed soil with active suction that pulls radon from beneath and vents it outside.

Both systems reduce radon by 90-99% and are typically installed in a single day. Use our estimate your radon mitigation cost for a specific estimate.

Acworth Homeowners

Acworth sits in two Zone 1 counties with among the highest radon risk in Georgia. If you have not tested your home, a 48-hour test gives you a definitive answer. Learn more about how radon mitigation works.

Radon in Acworth, Georgia: Local Data and What to Do

1. Why Acworth Has High Radon Risk