Radon Test Kit for Home: Brand and Buying Guide
A radon test kit for the home is the most accessible tool available for evaluating indoor radon levels. The kits sold by major brands like AccuStar, AirChek, RadonAway PRO-Lab, and FirstAlert all use validated EPA-recognized methods, produce comparable accuracy, and price in the $15 to $35 range at retail. Colorado homeowners benefit from CDPHE-subsidized kits at $15 for qualifying households, which makes Front Range testing accessible to nearly any budget. This guide walks through the specific brand options, where to source kits directly from the lab, what kit features matter for accuracy, and how to choose between short-term charcoal kits and long-term alpha-track detectors. Guidance summarizes EPA, CDPHE, and lab-vendor recommendations current as of 2026; consult a CDPHE-certified radon professional for real-estate transactions or post-mitigation testing.
What a radon test kit for the home includes
A typical short-term home radon test kit includes a charcoal canister or similar passive detector, written instructions covering the closed-house protocol and placement rules, a chain-of-custody form for documenting test conditions, and a pre-addressed return envelope or shipping label for sending the kit to the lab after exposure. Some kits include the lab fee in the kit purchase price; others require the homeowner to mail a separate check or pay online before lab analysis. Direct-from-lab kits typically bundle the lab fee into the kit price.
Long-term alpha-track kits include a sealed plastic detector film holder rather than a charcoal canister. The detector exposes for 90 days to a year, then returns to the lab for microscope counting of alpha particle tracks etched in the film. Long-term kits cost slightly more than short-term kits because of the extended lab analysis process, typically $25 to $50 each.
Major home radon test kit brands
AccuStar is one of the longest-established US radon test kit brands. AccuStar kits use either short-term charcoal liquid scintillation or long-term alpha-track detectors. The lab is EPA-recognized and maintains National Radon Proficiency Program (NRPP) accreditation. AccuStar kits are widely available through hardware retailers and direct from the lab. Pricing typically runs $20 to $30 for short-term kits and $30 to $50 for long-term kits, with lab fees included.
AirChek, another major US brand, uses short-term electret ion chamber and charcoal canister detectors. The lab is similarly EPA-recognized and NRPP-accredited. AirChek kits are common in hardware stores and through online retailers. RadonAway PRO-Lab, associated with the radon mitigation equipment manufacturer, uses charcoal and alpha-track detectors with similar pricing. FirstAlert markets a consumer-targeted kit, the FirstAlert RA1, that uses charcoal canister detection with lab analysis through a partner facility.
Colorado-specific kit sourcing
CDPHE operates a state-subsidized radon test kit program for qualifying Colorado households. The subsidized kits are typically priced at $15 each and use short-term charcoal canister detection with state-coordinated lab analysis. The program targets households that have not previously tested or who have moved into pre-1990 housing. Eligibility criteria and ordering information are available through the CDPHE radon program.
The CDPHE subsidy makes radon testing economically accessible across the Front Range and the rest of Colorado at a rate lower than most commercial kit pricing. Households that have already used a subsidized kit but want to retest after several years can purchase commercial kits at retail pricing, which still runs reasonable for periodic baseline confirmation.
Where to buy radon test kits in retail stores
Hardware retailers across the Front Range and most US markets stock radon test kits in the home safety, environmental testing, or seasonal department. Brand availability varies by store and region but typically includes one or two of the major brands at any given retailer. Retail pricing runs $20 to $35 for short-term kits with lab fees usually included. Some store-stocked kits require online registration of the kit serial number before mailing it back to the lab; the instructions cover the registration step.
Online marketplaces also stock the full range of major brand kits with similar pricing. Direct-from-lab purchases through the AccuStar, AirChek, or PRO-Lab websites sometimes offer modest savings on kit pricing and reliable shipping timelines. Buying directly from the lab also simplifies the chain of custody because the kit is pre-tracked from its serial number from manufacturing through lab analysis.
Short-term versus long-term test kits
Short-term charcoal canister kits expose for two to seven days. They are the most common home radon test kit type and produce results in two to three weeks total from test start to result delivery. The short exposure period means the result reflects conditions during the specific test window, which can be sensitive to weather, ventilation patterns, and seasonal factors during those few days.
Long-term alpha-track kits expose for 90 days to a full year. The extended exposure averages out short-term fluctuations and produces results more representative of long-term occupancy exposure. The trade-off is the longer wait time before results — total turnaround can stretch to four to five months including the 90-day exposure and lab analysis. For most homeowners, the practical compromise is to start with a short-term test as initial screening and follow up with a long-term test if the short-term result is borderline or if longer-term seasonal data is desired.
Kit accuracy and quality verification
All major brand kits sold in the US use methods recognized by the EPA’s National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). The labs that analyze the kits maintain certification through annual proficiency testing using known-concentration standard samples. Homeowners can verify lab accreditation through the NRPP or NRSB websites before purchasing a kit if they want additional confidence in the analysis quality.
Kit accuracy depends as much on homeowner protocol compliance as on the underlying technology. A correctly placed, properly handled kit from any major brand produces accurate results. A poorly placed or mishandled kit from the most premium brand produces unreliable results. The instructions matter; the brand differences in pricing reflect marketing, packaging, and analysis turnaround more than methodology accuracy.
Test kit placement and protocol summary
All home radon test kits follow similar placement and protocol requirements. The kit goes on the lowest livable level of the home — the basement if regularly occupied, the ground floor otherwise. Placement should be in a room where occupants spend significant time, 20 to 72 inches off the floor, away from drafts, exterior walls, fireplaces, and HVAC registers. The closed-house protocol requires windows and exterior doors closed for 12 hours before the test and throughout the test duration.
Kitchens, bathrooms, laundry rooms, and rarely-used storage spaces are not appropriate test locations. Self radon test methodology covers placement in more depth. The kit instructions reinforce the same rules — following them produces reliable screening data regardless of which brand kit is used.
Lab fee and turnaround expectations
Most home radon test kits include the lab fee in the purchase price. Kits sold through hardware retailers occasionally require a separate lab fee mailed in with the exposed kit; the instructions specify the process. Lab analysis time typically runs three to seven business days from receipt. Results return by email, mail, or both depending on the lab’s standard delivery method.
Total turnaround from kit purchase to result delivery typically runs two to four weeks for short-term tests, including shipping time both ways and lab analysis. Long-term kit turnaround is dominated by the exposure period, with lab analysis still running three to seven business days after kit receipt.
Interpreting and acting on home test kit results
Kit results report the average radon concentration during the exposure period in pCi/L. EPA action level is 4 pCi/L. Results below 2 pCi/L generally do not warrant further action. Results between 2 and 4 pCi/L are below the action level but warrant consideration of mitigation depending on occupant profile and time spent in the tested area. Results at or above 4 pCi/L warrant either a confirming test or direct mitigation planning.
Confirmation testing on a result at or above 4 pCi/L can be a second short-term test in the same location or a long-term alpha-track test for 90 or more days. Two independent results confirming the elevated concentration provide solid justification for proceeding with mitigation. The radon testing pillar guide covers the full decision pathway from initial test through mitigation.
Periodic retesting in the home
A single radon test in a home is a snapshot, not a permanent answer. Indoor radon levels can change over time as foundations settle, basement floor sealing degrades, the surrounding soil moisture profile shifts, or significant renovation alters the home’s pressure dynamics. EPA recommends retesting every two years even in homes that previously tested below the action level, with annual retesting in homes near the action level or in homes with mitigation systems.
Home test kits remain the right tool for periodic retesting. The cost is modest, the protocol is familiar after the first test, and the results provide ongoing confidence that radon levels remain acceptable. Front Range homeowners can stock a kit and run a retest during heating-season conditions every two years as a simple maintenance habit.
When to upgrade from kit to professional testing
Several scenarios warrant professional Continuous Radon Monitor (CRM) testing rather than a home test kit. Real-estate transactions where the test result drives contract terms typically require a CDPHE-certified Radon Measurement Specialist with CRM equipment. Post-mitigation verification testing usually uses a CRM for hour-by-hour documentation. Borderline or inconsistent home kit results that the homeowner wants to resolve definitively also justify a professional test.
Front Range homeowners with questions about whether a home kit or professional CRM testing fits their situation can contact our team for a referral to a certified Measurement Specialist for transactional or post-mitigation testing.
Storage and shelf life of unopened kits
Unopened home radon test kits have a shelf life that varies by detector type and manufacturer. Charcoal canister kits typically have shelf lives of six to twelve months in their original sealed packaging stored at room temperature. Alpha-track detectors typically have longer shelf lives, often 18 to 24 months. The expiration date is usually printed on the kit packaging or available in the kit registration database.
Kits stored beyond their shelf life may produce less reliable results because the detector materials degrade slowly even before opening. Buying kits as needed for current testing rather than stockpiling for future use produces more reliable data. Households running periodic biennial retests can buy a new kit at the time of each retest rather than maintaining shelf stock.
Handling kit results above expectations
A kit result substantially above the 4 pCi/L action level — readings of 10, 20, or higher pCi/L — can be unsettling on first reading. The right response is the same regardless of magnitude: confirm the result, plan mitigation, and verify post-mitigation performance. Mitigation systems work effectively regardless of starting concentration. A home with a 25 pCi/L pre-mitigation reading can be reduced to below 2 pCi/L by a properly designed and installed system.
Homes with very elevated initial readings sometimes warrant temporary occupant adjustments while mitigation is planned and installed. Spending less time in the highest-reading area, increasing ventilation through open windows when weather permits, and prioritizing mitigation scheduling can each help reduce cumulative exposure during the interim period. Mitigation installations typically schedule within two to four weeks of contract signing in the Front Range market.
References
- EPA Citizen’s Guide to Radon and testing kit guidance — US Environmental Protection Agency
- CDPHE Radon Program and subsidized test kit ordering — Colorado Department of Public Health and Environment
- American Lung Association radon testing resources — American Lung Association
Front Range homeowners ordering home radon test kits or evaluating whether professional CRM testing fits their situation can connect with our team for a referral to a CDPHE-certified Radon Measurement Specialist.
Radon test kits we recommend
Short-term charcoal kits are the cheapest way to get a first reading; mail the canister to the lab and results come back in days.
| Product | Why | Buy |
|---|---|---|
 AirChek Charcoal Radon Test Kit | Lab fee usually included; EPA short-term protocol. | Amazon — $21.95 |
 First Alert RD1 Radon Test Kit | Widely stocked; 48-hour charcoal test. | Amazon — $17.95 |
| Health Metric Radon Test Kit | Two-pack option for closed-house testing. | Amazon — $17.95 |