How to Choose Radon Detectors for Workplaces

On this page (8 sections)

1. What type of radon detector does a workplace need?
2. Which features matter in radon detectors for workplaces?
3. How many radon detectors does a workplace need?
4. How should workplace radon detectors be placed?
5. Product options that can support a workplace safety plan
6. How should a workplace manage results?
7. How do you choose radon detectors for multiple locations?
8. What is the best choice for workplace radon screening?

The best radon detectors for workplaces depend on whether you need an initial screening or ongoing measurements across several rooms. That decision should shape the device you buy and how you record and review results.

A small office that has never tested may need a simple test kit for a first baseline. A larger building with several occupied lower level rooms may need continuous monitors for repeated checks.

Start with a recognized test method. Consider continuous monitoring when building managers need repeated readings, alerts or records, since a screening kit and a monitor do different jobs.

Radon is a naturally occurring radioactive gas that can enter through foundations, drains, crawl spaces and other below-ground openings. It can also enter through construction joints, gaps around pipes and spaces where the ground meets the building.

Your plan should cover lower floors, occupied rooms and places where people spend long periods. Those areas matter most for exposure and for decisions about next steps.

Include rooms used only part of the day as well. Storage areas, plant rooms and rarely used offices can sit close to the ground and affect nearby readings.

This guide compares detectors and plans locations without treating unrelated alarms as radon monitors. Water and carbon monoxide alarms can support a wider safety plan, but they measure different hazards.

Keeping each product in its proper role keeps the plan clear. Store radon results separately from readings for other risks, and define rooms, monitoring period and review process before choosing a device.

What type of radon detector does a workplace need?

A workplace usually needs either a laboratory test kit for screening or a continuous monitor for repeated readings. The choice depends on how many locations you need to check and how quickly staff need access to results.

A test kit collects a sample over a defined period and sends it for analysis. This can suit an initial check when the goal is a documented measurement rather than live alerts.

A continuous radon monitor measures over time and may show changes between readings. It can suit building managers who need to watch several rooms, compare locations or respond when readings change.

For a closer explanation of the second option, read What Is a Continuous Radon Monitor? A Closer Explanation.

When is a test kit the better choice?

Choose a test kit when you need a straightforward first screening with laboratory processing. It can be useful for a small office, a newly occupied area or a workplace plan that begins with baseline measurements.

A kit does not replace a monitoring program when conditions vary by room or season. If the first result leads to more questions, plan follow-up testing in the areas that matter most.

When should a workplace use continuous monitoring?

Choose continuous monitoring when you need repeated readings, alerts or a record of changing conditions. This is especially useful when a building has several lower-level rooms, multiple occupied areas or different ventilation patterns.

A continuous monitor still needs a sensible placement plan. One device in a single room cannot describe every area of a large workplace.

Which features matter in radon detectors for workplaces?

Prioritize measurement purpose, result handling, placement and operating conditions. Features matter only when they support the way your team will collect, review and act on readings.

Look for these characteristics:

• A clear measurement method and readable results
• A monitoring period that fits your workplace plan
• Records or reports that staff can review
• Alerts if the device supports ongoing monitoring
• Placement flexibility for different rooms
• Operating conditions suited to the building
• A clear process for checking, replacing or repeating measurements

A clear measurement method matters because the result should mean the same thing each time it is used. If staff cannot tell how a sample was collected or how long it was exposed, they cannot compare one room with another or one period with the next.

Result handling is where many workplace plans succeed or fail. Agree in advance who will collect the device, who will read the result, and where the result will be filed, so a reading is never left unreviewed in an inbox or on a desk.

Placement flexibility affects whether a plan works in practice across a real building. A device that suits an open office may not suit a small enclosed room, a corridor, or a basement area with different airflow.

Operating conditions should be checked against the building itself rather than assumed. Humidity, temperature, drafts and regular cleaning can all affect where a device can sit undisturbed for the full monitoring period.

If recognition matters to your process, compare nrpp approved radon devices and confirm the current requirements that apply to your project. The right choice depends on whether your organisation needs a particular approval or method for its own records.

Do not choose a detector only because it has a loud alarm or a large display. Those features do not show that the device measures radon, and they tell you nothing about the quality of the measurement.

How many radon detectors does a workplace need?

The number depends on the building layout and the rooms you need to represent. Start with lower levels and occupied areas, then add places where construction, airflow or use differ.

A small workplace may begin with one screening location to establish whether radon is present in the main occupied area.

A larger building may need separate locations for a basement, ground floor, enclosed work areas and rooms with different ventilation. One reading should not cover areas that behave differently.

Consider how the building is used, not just how it is drawn. A room occupied eight hours a day matters more than a store cupboard, even if the cupboard is closer to the ground.

Consider changes over time too. Seasonal heating, new doors, altered vents or changed occupancy can shift airflow and make last year's placement worth revisiting.

Schools and other shared buildings often need a room-by-room plan. Our guide to radon monitors for schools explains why one reading may not represent every occupied space.

Classrooms on the same floor can still differ by position, windows and use. A consistent approach makes results easier to explain to staff, parents and managers.

Create a location record for each device with room, floor, date placed, test period, device identifier and the person reviewing the result. Keep it in one place and update it when a device moves or a new test begins.

Use the record to plan the next round. Avoid extra devices without a reason, since unreviewed duplicates add cost and confusion without useful information.

How should workplace radon detectors be placed?

Place detectors where people spend time and where radon entry is plausible, while avoiding conditions that could disturb the measurement. Follow the device instructions for height, distance from openings and test duration.

Before placing a detector:

1. Identify occupied rooms on the lowest usable level.
2. Mark rooms near foundations, drains, crawl spaces or other ground contact.
3. Avoid windows, doors, vents, fans and direct drafts.
4. Keep the location accessible to authorized staff.
5. Record the room and placement date.
6. Prevent accidental movement during the monitoring period.

Use the same placement approach when comparing rooms. Changing the location, duration or nearby airflow can make results harder to compare.

If your team performs property checks for clients, see how to choose a radon monitor for home inspections for a related monitoring workflow.

Product options that can support a workplace safety plan

The products below do not all measure radon. The first is a radon test kit.

The other two address water and carbon monoxide risks that may also matter in shared buildings, basements and utility areas.

First Alert Radon Gas Test Kit

The First Alert RD1 is designed for initial radon screening in a workplace or institution. It includes test materials and lab fees, excluding New Jersey state fees, and results are emailed within 72 hours of lab receipt.

The kit is listed under the EPA radon gas measurement proficiency program and is recommended for use only within the United States. Its stated operating humidity range is 10–95% RH.

Use it when your first need is a documented screening result rather than live readings from several rooms. Plan the monitoring locations before opening the kit, and record where the test was placed and when it was started.

The kit is a different tool from a continuous monitor. It can help establish a baseline, but it does not provide the same ongoing view of changes across multiple workplace areas.

The Basement Watchdog 110 dB Water Alarm

The Basement Watchdog BWD-HWA is a water alarm for basements, sump areas and hard-to-reach locations, not a radon detector. It detects as little as 1/32 in. of water and has a detachable sensor with a 6 ft wire.

Its 110 dB alarm is intended to be heard throughout the house, and the sensor can be wall mounted or extended with more than 100 ft of additional 24-Gauge wire. The additional wire is not included.

This type of alarm can help protect a lower-level monitoring area from a separate water problem. Keep its role clear in your records because a water alarm cannot measure radon or confirm indoor air conditions.

First Alert Plug in Carbon Monoxide Alarm

The First Alert CO615 is a carbon monoxide alarm for occupied areas, not a radon monitor. It uses an electrochemical carbon monoxide sensor, a digital display, an 85 decibel alarm and battery backup.

The alarm works with a standard outlet, while the battery backup supports monitoring during a power failure. Its operating humidity range is 10–95% RH, and the unit has a 7-year limited warranty.

Use carbon monoxide alarms as part of a broader workplace safety plan where fuel-burning equipment or other CO risks exist. Do not use a CO reading as evidence about radon, since the two gases require different detection methods.

For another general building-care consideration, compare desiccant dehumidifier vs compressor when moisture control affects a lower-level work area.

How should a workplace manage results?

Create a repeatable record for every monitoring location. A result is more useful when staff can identify the room, test period, device and next action.

Record:

• Building and room
• Floor or level
• Device or kit identifier
• Start and end dates
• Person responsible
• Result and units
• Follow-up action
• Date of the next check

Keep radon results separate from water and carbon monoxide alarm records. The products serve different safety tasks, so combining them in one undifferentiated log can cause confusion.

If a result is high, follow applicable public health guidance and use a qualified professional when assessment or mitigation is needed. For a mitigation system, see our radon manometer gauge guide to learn how its pressure indicator can support system checks.

Do not make workplace health decisions from one reading without considering the testing method, location and monitoring period.

How do you choose radon detectors for multiple locations?

Choose equipment by the number of rooms, the need for repeated data and the way results will be reviewed. A test kit may suit a baseline screening, while continuous monitors may fit buildings with several occupied areas or changing use.

For a multi-location plan, ask:

• Can staff place the device in every priority room?
• Will the monitoring period be practical?
• Can someone review results on a set schedule?
• Are alerts needed?
• Can the team identify each device and location?
• What happens after a concerning result?

Start by listing priority rooms and checking whether staff can place a device without disrupting work. Locked, rarely accessed or frequently cleaned rooms must be reflected in the plan.

Fit the monitoring period to workplace rhythms. A busy week, holiday shutdown or heating change can make a result harder to interpret.

Assign a named person for each review and agree who covers when they are away. Decide in advance what an alert means, who hears it and what action follows.

Label each device to match the location record and check labels at collection so results are not matched to the wrong room. Plan for a concerning result before you start, including the guidance you will follow and whether you will seek a qualified professional.

Use consistent placement rules and avoid moving devices during an active period. Note real differences between sites rather than forcing the same setup.

Review the plan after each round and record anything missed, late or disturbed. Change the next round openly based on what happened.

What is the best choice for workplace radon screening?

Pick the First Alert RD1 when you need an initial laboratory-based screening kit for a workplace or institution. It is the simplest route to a documented first result, with test materials and lab fees included, excluding NJ state fees.

Choose a continuous radon monitor when you need repeated readings, alerts or comparisons across multiple locations. That approach suits building managers who must watch several rooms over time and respond as conditions change.

Use the Basement Watchdog for water detection in lower-level areas, and use the First Alert CO615 for carbon monoxide protection. Neither replaces a radon detector, and neither should be recorded as if it provided a radon measurement.

Start with the rooms and decisions your workplace plan must cover. List the lower level and occupied areas first, then decide how many locations you need to represent and for how long.

Then select the measurement method, placement process and record system that your team can follow consistently. A plan that staff can actually carry out is better than a more complex plan that breaks down in practice.

For a first screening, keep the process straightforward. Place the test where people spend time, follow the instructions for the full test period, and record the room and dates so the laboratory result can be understood in context.

For ongoing monitoring, focus on routine. Check devices on a set schedule, review results in the same way each time, and make sure every reading has a named person responsible for the next step.

Keep radon records separate from water and carbon monoxide records. The separation prevents confusion and makes it clear which device measured which hazard in which room.

If a result raises concern, follow applicable public health guidance and use a qualified professional when assessment or further testing is needed. A screening result is a starting point for action, not a full assessment on its own.

The best choice is the one that matches your building, your rooms and your review process. When those three line up, the results will be easier to trust and easier to act on.

Frequently asked questions

What should workplaces look for in a radon detector?

Workplaces should match the detector to the monitoring task. A test kit can support an initial screening, while a continuous monitor is better when you need repeated readings, alerts and records.

Check the device's measurement method, placement needs, operating conditions and whether its results suit your reporting process.

Where should radon detectors be placed in a workplace?

Place detectors in occupied areas where people may spend time, especially lower levels and rooms close to the ground. Use the building layout to identify separate monitoring locations, avoid drafts and excessive moisture, and follow the device instructions for height, spacing and test duration.

Are radon detectors suitable for every workplace?

No single radon detector suits every workplace. A small office may need one screening location, while a school, warehouse or multi-floor building may need several.

Choose equipment based on the number of rooms, monitoring period, need for records and the action plan if readings are high.

Should a workplace use a radon test kit or a continuous monitor?

Use a test kit when you need an initial measurement with laboratory results. Choose continuous monitoring when repeated readings, alerts or trend information matter.

The right choice also depends on the building's policy, local guidance and whether someone must review results across multiple locations.