Radon Test Near Me: 2026 Service Guide
A radon test near me search returns local NRPP-certified and CDPHE-certified Radon Measurement Specialists who deploy continuous radon monitors (CRMs) to measure indoor radon concentrations over 48 hours and produce defensible results for real estate transactions and homeowner assessment. This guide summarizes EPA and CDC guidance current as of 2026 — consult a certified professional for testing or mitigation and your physician for symptom evaluation. The discussion covers what the local service includes, typical Front Range Colorado pricing ($100 to $300 for a 48-hour CRM deployment), credential verification, when professional testing is worth it versus a $15 to $30 DIY kit, and how the result feeds into the next decision.
What a local radon test service actually delivers
A professional radon test near me service deploys a continuous radon monitor (CRM) at the home, leaves the device in place for a 48-hour test window under closed-house conditions, retrieves the device, and produces a written report with the average radon concentration and hour-by-hour readings throughout the test period. The CRM is a calibrated, electronic device that measures radon directly using alpha-spectroscopy or pulsed ionization chamber technology; it does not require laboratory analysis like postal-return DIY kits.
The CRM advantage over DIY kits is immediate, defensible results with full diagnostic data. The hour-by-hour readings show how indoor radon varied during the test period, which can flag conditions like an open window mid-test (indicated by an abrupt drop in readings) or HVAC anomalies. The report is in a format that real estate professionals, mitigation contractors, and the buyer’s transaction team can readily use during the inspection contingency window.
Front Range Colorado pricing
Pricing for a professional radon test in the Denver metro and Front Range corridor typically runs $100 to $300. The lower end of the range corresponds to add-on radon testing during a general home inspection (the same inspector deploys the CRM at the same visit). The upper end corresponds to standalone CRM deployments where the radon professional makes a dedicated visit to the property.
Several factors push pricing within the range. Real estate transaction tests at the lower end typically use existing general-inspection contracts and represent volume work for the inspector. Standalone CRM tests for current homeowners (not under contract) typically price higher because the inspector makes a dedicated visit for placement and a second for retrieval. Mountain communities run higher due to drive time. For the parent context on transactional pricing, the sibling article on radon gas testing service covers Front Range patterns.
NRPP, NRSB, and CDPHE: the credential framework
Three certifications matter for residential radon measurement professionals operating in Colorado. The federal National Radon Proficiency Program (NRPP) and National Radon Safety Board (NRSB) issue national radon measurement certifications. Colorado requires CDPHE state certification for radon measurement professionals operating in the state.
A homeowner commissioning a radon test should verify all relevant certifications. NRPP and NRSB publish certified-professional databases that are publicly searchable. CDPHE publishes the Colorado-certified radon measurement specialist registry. Many Front Range general home inspectors hold dual certification (general inspection plus NRPP or NRSB radon measurement plus CDPHE state) and offer combined inspection plus radon testing as a packaged service. The CDPHE radon program reference covers the state credential framework.
How the continuous radon monitor works
A continuous radon monitor is a calibrated electronic device that measures radon concentration in indoor air at hourly intervals throughout the test window. Modern professional CRMs use alpha-spectroscopy (which distinguishes radon decay products from other radioactive sources) or pulsed ionization chamber technology. The device displays running readings and stores the full hour-by-hour data for download at the end of the test.
CRMs require regular calibration to maintain accuracy. EPA-recognized devices must be calibrated at least annually by an accredited calibration facility, and the certified professional must maintain calibration documentation. Calibration ensures the CRM produces readings within established accuracy bounds (typically plus or minus 20 percent at the action level of 4 pCi/L). The sibling article on continuous radon monitor and detector kit guide walks through the technology.
When professional testing is worth it
Professional CRM testing is worth the premium over DIY kits in several specific situations. Real estate transactions are the most common: the buyer needs a defensible result, immediate availability, and the ability to feed the inspection contingency timeline. The 3 to 7 business day turnaround on lab-analyzed DIY kits often does not fit the contingency window, especially in tight transactions.
Other situations that warrant professional testing include suspicion of high radon (a previous test or neighbor’s result above 8 pCi/L suggests immediate action may be needed), pre-mitigation diagnostic testing (where the hour-by-hour data informs mitigation system design), and post-mitigation verification testing (where a defensible result confirms the mitigation system performance). For the broader testing decision, the parent guide on Front Range radon testing walks through the test-type decision.
When DIY kits are the right choice
DIY short-term radon test kits cost $15 to $30 at hardware stores or online retailers, plus laboratory analysis fees of $20 to $40 (often included in the kit price). The kits use charcoal canisters that adsorb radon during the 2 to 7 day exposure period; the canister is then mailed to a laboratory for analysis. Long-term DIY kits (alpha-track detectors) measure for 90 days to a year and produce a more representative average.
DIY testing is appropriate for several situations. Initial homeowner assessment in a home that is not currently in transaction can use a DIY kit because there is no time pressure. Periodic re-testing of a previously tested home (every 2 to 5 years) can use a DIY kit because the homeowner already has baseline context. Long-term re-testing after a mitigation system has been operating for some years can use DIY long-term kits to capture seasonal variation.
DIY kits are not the right choice for real estate transactions, post-mitigation verification, or any situation where immediate, defensible results matter. The lab turnaround time alone often makes them unworkable for transaction timing. For broader DIY context, the sibling article on self radon test DIY methodology guide walks through the placement and timing.
Placement during the 48-hour test
The certified professional places the CRM in the lowest livable level of the home that is regularly occupied. For homes with finished basements (basement bedrooms, basement family rooms), placement is in the basement. For homes with unfinished basements that no one regularly uses, placement is on the first floor. Within the chosen level, the CRM is placed in a regularly occupied room, at least 20 inches above the floor and 12 inches from exterior walls.
Closed-house conditions are required for the 48-hour test window and for the 12 hours preceding it. Windows and exterior doors should be closed except for normal entry and exit. HVAC systems should operate on normal settings. The professional explains the closed-house protocol to the homeowner at placement and verifies conditions at retrieval. Hour-by-hour CRM data flags conditions that violated the protocol (a window opened mid-test produces a visible drop in readings that may invalidate the result).
Interpreting the test result
The test report includes the average radon concentration over the 48-hour window plus hour-by-hour data. The EPA action levels structure the response:
Below 2 pCi/L: Lower priority for action. Re-test every two to five years or after significant home changes (foundation work, basement finishing, HVAC replacement).
2 to 4 pCi/L: Intermediate zone. EPA recommends considering mitigation, especially when occupants spend significant time in the lower levels of the home. Confirm with long-term re-testing before deciding on mitigation.
4 to 8 pCi/L: EPA action level. Mitigation is recommended. The short-term result alone is usually sufficient justification, especially for transactional purposes.
8 pCi/L and above: Higher-priority action. Mitigation is strongly recommended and is often pursued without further confirmation testing.
For Colorado-specific guidance, the sibling article on Colorado radon testing and the CDPHE program covers the action-level framework in the Colorado context.
Combining radon testing with general home inspection
Buyers under contract in Colorado typically commission radon testing as an ancillary to the general home inspection. The combined visit reduces total cost, scheduling friction, and report turnaround. Some Front Range general inspectors hold NRPP and CDPHE radon certifications and deploy the CRM at the inspection visit; others sub-contract the radon test to a specialist who comes separately.
Either arrangement works. The buyer should verify that the inspector or sub-contractor holds current NRPP or NRSB certification plus CDPHE state certification. The combined inspection plus radon test is typically priced at $475 to $750 in Front Range Colorado for a 2,000 to 2,500 square foot single-family home, depending on home size and additional ancillaries. The parent guide on hiring a Front Range home inspector covers ancillary scope selection.
What the test does not tell you
The radon test result represents the average concentration during the 48-hour test window under closed-house conditions. It does not predict concentrations at other times of year, in other parts of the house, or under non-closed-house conditions. Winter readings typically run higher than summer readings because building tightness and the stack effect both increase in winter.
A short-term test does not capture seasonal variation. A long-term test (90 days to a year) captures seasonal variation better but is impractical for transaction timing. The standard practice in transactions is to test in the lowest livable level under closed-house conditions and accept that the result represents a snapshot of conditions during the test window. If the snapshot is above the action level, mitigation is recommended; if well below, the homeowner can defer decision-making to long-term re-testing.
How to verify certified radon professionals
The verification checklist for a Front Range radon test professional:
- NRPP or NRSB certification (search the certified-professional database at the relevant national program).
- CDPHE Colorado state certification (search the state radon program registry).
- Calibration documentation for the CRM device used.
- Certificate of insurance covering professional liability and general liability.
- Sample report showing format, hour-by-hour data, and report clarity.
The verification can be completed in about 15 minutes of work before booking. A reputable professional provides credentials and sample reports without hesitation. A professional who hesitates is signaling something about the engagement.
The radon test as a real estate transaction component
In a Colorado real estate transaction, radon testing typically occurs during the inspection contingency window (7 to 10 days from contract acceptance). The buyer commissions the test in the first 1 to 2 business days of contract, the CRM is deployed for 48 hours, the result is reported within 24 hours of retrieval, and the buyer has the remaining contingency window to negotiate mitigation as part of the request-for-repairs response.
If the test result is at or above 4 pCi/L, the buyer typically requests mitigation as part of the request-for-repairs. Common outcomes include the seller installing mitigation before closing, the seller crediting the buyer to install after closing, or the parties splitting the cost. The result rarely terminates the transaction because mitigation is effective and well-established. The sibling article on the full radon testing and mitigation workflow walks through the transaction sequencing.
Front Range scheduling and timing
Front Range radon professionals typically schedule one to two weeks out during peak real-estate season (spring and summer). Buyers under contract with a tight inspection contingency window should book the radon test within the first business day of contract acceptance, alongside the general home inspection booking.
The 48-hour test window plus same-day or next-day report turnaround means the full radon testing cycle takes about 3 days from booking to result. Outside the transaction context, scheduling pressure is lower and homeowners can typically book within a few days. Same-day rush testing is rarely available because the CRM needs to remain in place for the full 48 hours.
What happens during the placement visit
The professional placement visit takes 15 to 30 minutes. The radon specialist arrives at the property, walks the home with the owner or buyer’s representative, identifies the appropriate placement location (lowest livable level, regularly occupied room, away from windows and ventilation paths), and places the CRM device. The professional explains closed-house protocol requirements, confirms that the homeowner understands them, and provides written documentation of placement.
The CRM is a small electronic device, typically the size of a small countertop appliance. The device runs on internal battery for the full 48-hour deployment. The homeowner does not need to interact with the device during the test; the specialist returns to retrieve it at the end of the test window. Some Colorado specialists use dual-CRM placement (one device in the basement and one on the first floor) for more comprehensive measurement; the dual placement typically adds $50 to $100 to the basic price.
What happens during the retrieval visit
The professional retrieval visit takes 15 to 30 minutes. The radon specialist returns to the property, downloads the CRM data on site (most modern devices download via USB or Bluetooth in seconds), and reviews the hour-by-hour readings to confirm the test was valid. Validity checks include whether closed-house conditions were maintained (visible from data continuity) and whether the device experienced any tampering or movement during the test window.
The specialist provides the result verbally at retrieval and follows up with the written report within 24 hours. The written report includes the average concentration in pCi/L, the hour-by-hour data plotted over the test period, placement details, environmental notes from the placement visit, and the specialist’s certifications. Real estate buyers can immediately share the report with their agent and start the request-for-repairs conversation if the result is at or above the action level.
The follow-up after a high test result
A radon test result at or above 4 pCi/L typically leads to one of three follow-up paths. The first is engaging a radon mitigation contractor for assessment and quote; the mitigator’s pre-installation site visit produces a system design and price for installation. The second is requesting that the seller (in a transaction) install mitigation as part of the request-for-repairs negotiation. The third is commissioning a long-term re-test to confirm the short-term result before committing to mitigation.
Most Colorado homeowners with results above 4 pCi/L proceed directly to mitigation. The condition is well-understood, the system is well-established, and the cost ($1,000 to $2,500 for a typical Front Range installation) is modest relative to the lifetime health benefit. The sibling article on what is radon mitigation covers the mitigation system in detail.
Combined radon test plus general home inspection scheduling
The most common scheduling pattern for buyers under contract combines the general home inspection with the radon test in a single inspector visit. The general inspector deploys the CRM at the start of the inspection (typically a 2.5 to 3.5 hour visit) and returns 48 hours later to retrieve it. This pattern minimizes the homeowner’s calendar friction and produces both reports in approximately the same timeframe.
Some buyers schedule the radon test slightly earlier than the general inspection to ensure the 48-hour window completes within the inspection contingency. Others schedule them simultaneously and accept the slightly later combined report. Either pattern works as long as the contingency timeline accommodates the testing window plus reasonable time for the request-for-repairs negotiation. The sibling article on the full radon testing and mitigation workflow covers transaction sequencing.
Front Range homeowners or buyers looking for a vetted NRPP and CDPHE-certified Radon Measurement Specialist can connect with one through our contact page.
References
- EPA Radon Program — Environmental Protection Agency
- Colorado Department of Public Health and Environment radon program — CDPHE
- CDC Radon Information — Centers for Disease Control and Prevention
- American Lung Association radon guidance — American Lung Association