Radon Levels & Zone Map in Walker County, AL
Direct Answer for basement and lowest-level tests: Walker County has enough official radon signal that the practical answer is not just map-reading. Official county data shows 2.3 pCi/L and 33.3% at or above 4.0. Start with a real home test, then retest or price only from the result.
Do not stop at the map label
The official data is not a clear dismissal. Use it to justify testing or retesting, then let the home result decide whether pricing makes sense.
Official measured data is elevated enough to justify testing or retesting.
2.0-3.9 pCi/L usually means retest or track. 4.0+ is where EPA action and quote planning start to matter.
No reading: test first. Borderline results often need retest or long-term tracking.
Measured Radon Data
Walker County evidence before the next step
Walker County, AL has more than the EPA map: CDC Tracking Network exposes 12 reported tests, 2.3 pCi/L county average, 1.4 pCi/L median, 33.3% of reported tests at or above 4.0 pCi/L, and 5.5 pCi/L high-end signal for 2008-2017.
Source window
2008-2017
County evidence type
Elevated measured burden
County context only; your home test controls the decision.
Primary result
2.3 pCi/L
60th percentile in-state
4.0+ signal
33.3%
91st percentile in-state
High-end signal
5.5 pCi/L
45th percentile in-state
Official evidence dossier
Source record for Walker County, AL
CDC Tracking provides comparable county-level measurement fields; state-specific sources still outrank it when they expose stable county tables.
Primary public source
National tracking data
Measurement window
2008-2017
Retrieved / checked
2026-05-05
County FIPS
01127
Evidence stack
County source
National tracking data
Primary source used for the county evidence row.
Federal map
EPA Map of Radon Zones
Zone 2 is context, not a property result.
Housing context
US Census ACS housing context
52.9% built before 1980; 30,127 housing units.
State follow-up
State radon program
Use the state source before hiring or interpreting local rules.
Primary field
2.3 pCi/L
Median field
1.4 pCi/L
4.0+ field
33.3%
Sample / volume
12 over 10 years
Metric shape
This is the most useful setup: county average, 4.0+ share, high-end readings, and 12 reported tests/properties can be read together instead of relying on one number.
Source limitation
CDC county summaries are based on national radon testing laboratories and participating state feeds; they are not a statistically designed survey of every home.
Property-level limit
Not a property-level diagnosis. The county record explains local evidence; your home's own test result controls the next decision.
County-specific interpretation
Walker County is elevated enough that map-reading should turn into a home test.
Walker County is a priority-test case because 2.3 pCi/L average, 1.4 pCi/L median, and 33.3% of reported tests at or above 4.0. In-state rank: 60th percentile for average, and 91st percentile for 4.0+ share. The county signal is strong enough to justify testing or retesting before cost decisions.
Real-estate use
Buyer or seller use: ask for a fresh lowest-level test before inspection deadlines, tie any 4.0+ result to a contractor quote, and do not negotiate from the county signal alone.
Walker County has enough measured elevation that buyers and owners should not stop at the county signal; confirm the home and price mitigation if the result crosses 4.0.
Use This EvidenceOfficial state path
Open the state radon program
Use state rules and local program contacts before choosing a contractor.
EPA hiring guidance
Find a qualified radon provider
EPA points homeowners to state programs and national proficiency listings.
Certified professional search
Search NRPP-certified pros
Use this after you have a valid result or need professional testing.
Elevated-intent answer
Are radon levels elevated in Walker County?
Walker County has enough measured elevation that the answer should not stop at the EPA zone. 33.3% of reported tests at or above 4.0 pCi/L, 2.3 pCi/L primary measured result, and 5.5 pCi/L high-end signal makes a first test or confirmatory retest the right next step before cost decisions.
Enter the result. Pick the deal side. Get the route.
Official measured data is elevated enough to justify testing or retesting.
County signal
2.3 pCi/L
At or above 4.0
33.3%
Decision side
Foundation clue
Search intent router
Start from the exact job, not another generic radon article.
Pick the situation that matches Walker County, AL. Each route keeps the reading, deal side, or foundation clue attached so the next page answers the search instead of resetting the user.
Failed inspection
I need a repair or seller credit number
Open the local credit path with a 4.0+ buyer scenario already selected.
Open negotiation route4.0+ pCi/L
I have a high result and need the cost path
Go straight to the county estimate, quote context, and contractor checklist.
Open cost route2.0-3.9 pCi/L
I need to know if this number is bad
Use the level explanation first, then decide whether to retest, monitor, or price mitigation.
Open level routeNo test yet
I need the first valid result
Start with kit placement, timing, closed-house conditions, and result interpretation.
Open testing routePick the situation that matches you
You should not need to read the whole guide before clicking one of these. Start with the lane that matches your current stage, then come back for the deeper reference only if you still need it.
Jump into a prefilled Walker County action plan based on the result you already have, instead of starting from a generic cost page.
I have not tested yet
Do not price mitigation blind. Get the first number, then decide whether you need monitoring, quotes, or nothing at all.
My result is 2.0-3.9
Usually confirm the reading first. If it keeps showing up, use the county evidence and official guidance before deciding whether pricing makes sense.
My result is 4.0+
This is the EPA action line. Use the local cost page before calling contractors so you know the likely scope, timing, and budget.
I am buying or selling
Turn the reading into a credit or repair number before negotiation starts. This is the faster path than arguing from a generic article.
Already tested once and need the cleanest follow-up path?
Review retesting stepsCounty Evidence Snapshot
Walker County testing context
Walker County has enough official radon signal that the answer should not stop at the EPA map. Official county data shows 2.3 pCi/L and 33.3% at or above 4.0. Confirm the home before pricing mitigation, but do not dismiss the county as low urgency.
EPA map signal
Zone 2
County-level predicted indoor screening range, not a home-level test result.
Housing base
30,127
70th percentile among 67 AL counties with data.
Older housing share
52.9%
36th percentile in-state; older homes often need clearer test placement decisions.
Median home value
$124,100
Used as context for whether mitigation is a small maintenance item or a negotiation issue.
Measured Radon Data
CDC Environmental Public Health Tracking Network Radon Tests from Labs
2008-2017
Average result
2.3 pCi/L
At or above 4.0
33.3%
Maximum reported
5.5 pCi/L
10-year tested
12
CDC county summaries are based on national radon testing laboratories and participating state feeds; they are not a statistically designed survey of every home.
County evidence interpretation
Elevated measured burden
Primary result rank
60th percentile
2.3 pCi/L
4.0+ rank
91st percentile
33.3% at or above 4.0
High-end rank
45th percentile
5.5 pCi/L
Test volume rank
54th percentile
12 over 10 years
How to use this county data
Data source
National tracking data
CDC Tracking provides comparable county-level measurement fields; state-specific sources still outrank it when they expose stable county tables.
What the numbers show
Fuller county picture
This is the most useful setup: county average, 4.0+ share, high-end readings, and 12 reported tests/properties can be read together instead of relying on one number.
Nearby comparison
Nearby comparison: Closest counties by share of tests at or above 4.0 pCi/L: Lauderdale County (27.2%) is just lower, and Colbert County (36.2%) is just higher.
How this helps
Use this to decide whether the county signal is strong enough to justify testing or retesting before cost decisions.
What the data says
Walker County, AL is measurement-backed for 2008-2017. The measured average is 2.3 pCi/L, and 33.3% of reported results are at or above 4.0 pCi/L. The high-end signal reaches 5.5 pCi/L.
Walker County, AL sits at the 60th percentile for measured average, 91st percentile for 4.0+ share, 45th percentile for high-end readings, and 54th percentile for test volume among 67 measured counties in the state. Closest counties by county average: Sumter County (2.3 pCi/L) is just lower, and Elmore County (2.4 pCi/L) is just higher.
What to do with it
Walker County has enough measured elevation that buyers and owners should not stop at the county signal; confirm the home and price mitigation if the result crosses 4.0.
Retest trigger: a 2.0-3.9 pCi/L home result should be confirmed here because 2.3 pCi/L average, 1.4 pCi/L median, and 33.3% of reported tests at or above 4.0 keeps the county from being a dismiss-it signal.
Source-backed context from CDC Tracking Network based on about 12 reported tests/properties plus comparable county-level measurement fields.
No reading yet
No reading yet: run a short-term test now, then confirm or price mitigation quickly if the result is elevated.
2.0-3.9 result
2.0-3.9 pCi/L: retest or track longer-term rather than dismissing the result, because the county distribution has meaningful elevated readings.
4.0+ result
4.0+ pCi/L: use the result for mitigation quotes, repair scope, or seller-credit negotiation; the county signal is no longer the deciding input.
Source hierarchy: CDC Tracking Network is used for this county, with EPA zone and Census housing data kept as supporting context. CDC Tracking provides comparable county-level measurement fields; state-specific sources still outrank it when they expose stable county tables.
Direct Answer
Are radon levels elevated in Walker County?
Walker County has enough measured elevation that the answer should not stop at the EPA zone. 33.3% of reported tests at or above 4.0 pCi/L, 2.3 pCi/L primary measured result, and 5.5 pCi/L high-end signal makes a first test or confirmatory retest the right next step before cost decisions.
| Evidence | Value |
|---|---|
| Area | Walker County, AL |
| EPA Zone | Zone 2 |
| Primary Recommendation | Perform direct radon testing in the lowest livable level |
Your Radon Reading
Enter your home's measured level; the starting value is only a planning example until you have your own result.
Elevated - Consider Action
Your reading is below the US EPA action level (4.0 pCi/L), but this range still warrants follow-up testing. The World Health Organization uses 2.7 pCi/L as a tighter reference point.
If this was just a one-time snapshot, confirm it with another test or with longer tracking. If this level persists, planning mitigation is reasonable, especially for homes with frequent basement use, children, or pending real-estate transactions. Scroll down to see your estimated cost.
Understanding Radon Levels: Complete Reference
Below 2.0 pCi/L - Lower Concern, Keep Testing
Below both the EPA (4.0) and WHO (2.7) action reference levels. This usually means mitigation is not the next immediate step after a confirmed result. The average outdoor radon level is approximately 0.4 pCi/L, and there is no known risk-free indoor level. Periodic testing is still recommended because levels can change over time due to seasonal variations, changes in home ventilation, or foundation settling.
-4.0
2.0 - 4.0 pCi/L - Elevated, Consider Action
Exceeds the World Health Organization's reference level of 2.7 pCi/L but falls below the US EPA action threshold. The EPA states that homeowners should "consider fixing" homes in this range, especially if the home has a basement used as living space, if children are present, or in connection with a real estate transaction. Practical next step: run a confirmatory long-term test, then compare mitigation quotes if levels remain elevated.
-8.0
4.0 - 8.0 pCi/L - Action Recommended
Exceeds the EPA action level of 4.0 pCi/L. The EPA and Surgeon General strongly recommend mitigation within a few months. At this level, prioritize confirmatory testing and contractor planning. Standard sub-slab depressurization systems typically reduce indoor levels by 80-99%.
Above 8.0 pCi/L - Urgent Action Required
At these levels, the EPA recommends expedited mitigation - ideally within weeks, not months. Occupants should minimize time in lower-level rooms until the system is installed. Use a certified mitigator and request priority scheduling to shorten high-exposure time. Many mitigators offer priority scheduling for homes above 8.0 pCi/L.
Why Radon is a Testing Priority in Walker County
The EPA map is only the starting layer for Walker County. Official county data shows 2.3 pCi/L and 33.3% at or above 4.0. That source-backed signal is why the practical move is testing or retesting before treating the county as low urgency.
This still is not a diagnosis for any single home. Foundation type, lowest-level use, pressure differences, and small geological changes can move one house above or below the county pattern.
If you do not have a reading yet, start with a short-term test in the lowest lived-in level. If the result is 2.0-3.9 pCi/L, confirm it; if it is 4.0+ pCi/L, move into mitigation pricing or seller-credit planning.
Radon & Health: What the Science Says
lung cancer
from radon
4.0 pCi/L
Radon is a Class A carcinogen - the same classification as asbestos and tobacco smoke. The National Academy of Sciences estimates that radon causes approximately 21,000 lung cancer deaths annually in the United States, making it the leading environmental cause of cancer death.
Unlike smoking, radon exposure is involuntary and often invisible. There is no safe level of radon - risk increases linearly with exposure. The good news: radon mitigation systems are highly effective, typically reducing indoor levels by 80-99% within hours of activation.
Source: US Environmental Protection Agency, "A Citizen's Guide to Radon" (EPA 402/K-12/002). National Academy of Sciences, Biological Effects of Ionizing Radiation (BEIR VI) Report, 1999.
Step 1: Test Your Home
Testing is the only way to know your home's radon level. Zone and county data tell you the regional signal, but your home could be significantly higher or lower than the countywide pattern. Start with a valid test setup before using any cost path.
State radon programs and EPA provider guidance are the right reference before hiring or confirming local requirements.
Open the state radon programAlready Know Your Level?
If your test shows 4.0 pCi/L or higher, get an itemized cost estimate specific to Walker County - including regional labor rates and permit requirements.
Get Mitigation Cost Estimate ->AL Radon Regulations
Alabama does not have specific radon disclosure requirements for real estate transactions.
Alabama does not require state licensing for radon professionals. Look for NRPP or AARST-certified professionals.
How to Test for Radon in Walker County
Buy a Test Kit
Purchase a short-term charcoal test kit online or from a local hardware store. Cost: $15-$30. Place it in the lowest livable level of your home.
Wait 2-7 Days
Keep doors and windows closed (except normal entry/exit) during the test period. Avoid running whole-house fans. Mail the kit to the lab provided.
Read Your Results
If results are below 4.0 pCi/L, re-test every 2 years or use a monitor for ongoing tracking. If above 4.0, use our cost calculator to see mitigation options.
Related Radon Resources for Walker County
Explore Other AL Counties
Official State Resource
Alabama radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure note
Alabama does not have specific radon disclosure requirements for real estate transactions.
Credential note
Alabama does not require state licensing for radon professionals. Look for NRPP or AARST-certified professionals.
Sources & Methodology
Radon zone classifications for Walker County are sourced from the EPA's Map of Radon Zones, which uses geological surveys, indoor radon measurements, and soil permeability data to assign each county a risk tier.
Disclaimer: Zone data represents county-level screening ranges and cannot predict the radon level in any specific home. Testing is the only reliable method to determine your home's radon concentration. This content is for informational purposes and is not medical advice.
Content review: Source-level retrieval dates
Editorial and Data Transparency
- Author
- RadonVerdict Data Team (Public Data and Cost Modeling)
- Content Review
- Source-level dates shown below
- Data Retrieved At
- 2026-02-24
Primary Sources
- EPA Map of Radon Zones (retrieved 2026-02-21)
- EPA A Citizen's Guide to Radon (retrieved 2026-05-05)
- CDC Environmental Public Health Tracking - Radon Testing (retrieved 2026-05-05)
- Official AL radon program
- US Census Bureau, 2018-2022 American Community Survey 5-Year Estimates (retrieved 2026-02-24)