Most health risks announce themselves eventually. A pain, a cough, a number on a blood test. Radon does none of that. It has no colour, no smell and no taste, and the only way to know whether it is in your home is to measure it. Ireland has some of the highest indoor radon levels in Europe, and the Environmental Protection Agency estimates it causes around 350 cases of lung cancer here every year. The good news: this is one of the few serious health risks you can test for cheaply and fix for the price of a decent appliance.
TL;DR
- Radon is a naturally occurring radioactive gas that seeps from the ground into buildings. The EPA links it to roughly 350 lung cancer cases in Ireland each year, and it makes up about 60% of the average Irish person’s radiation dose.
- Ireland’s national reference level for homes is 200 becquerels per cubic metre (Bq/m³). The average Irish home sits near 77 Bq/m³, but High Radon Areas exist countrywide and you cannot tell from the outside.
- Testing costs roughly €40 to €60: two small detectors, left in place for three months, posted to an EPA-registered laboratory.
- Fixes run from a few hundred euro for better ventilation to about €1,200 for an active sump, which typically cuts levels by around 90%.
- Homeowners aged 66 and over may qualify for the Housing Aid for Older People grant, worth up to €10,700, and the EPA provides a free retest after remediation.
What radon actually is
Uranium is present in small amounts in almost all rocks and soils. As it decays it produces radium, which decays into radon: a radioactive gas that moves freely through soil and rock. Outdoors it disperses harmlessly. Indoors is different, because radon is drawn up through cracks in floors, gaps around pipework and unsealed foundations, where it accumulates.
The harm comes not from the gas so much as its decay products, tiny radioactive particles that lodge in lung tissue and deliver radiation straight to the cells lining the airways. Over decades, that raises the risk of lung cancer. The World Health Organization ranks radon second only to tobacco as a cause of lung cancer worldwide, and first among people who have never smoked.
Why Ireland has a particular problem
It comes down to geology. Granites and certain other rock types contain more uranium, and Ireland has plenty of them. The EPA designates High Radon Areas as places where more than 10% of homes are predicted to exceed the reference level, and parts of Galway, Mayo, Sligo, Clare, Kerry, Cork, Waterford, Carlow, Wicklow and Louth feature prominently.
The EPA’s interactive map lets you check your address at epa.ie, with one important caveat: it predicts risk across an area, it does not measure your house. Two neighbouring homes can differ widely depending on foundation type and ventilation. A map check is a starting point, never a substitute for testing.
Why this matters more after 50
Radon risk is cumulative: it depends on the concentration you breathe multiplied by the years you spend breathing it. The longer you have lived in the same house, the more relevant your level becomes, and many people in their 50s, 60s and 70s have been in the same home for decades without ever testing it.
Retirement, reduced hours and caring responsibilities all increase time spent at home. If you are now indoors eighteen hours a day rather than twelve, exposure rises accordingly. Anyone planning to age in place has good reason to know what is in the air they will breathe for the next twenty years.
There is a modern wrinkle too. Draught-proofing and the sensible push to cut heating bills have made Irish homes far more airtight, which is excellent for warmth and fuel costs, but sealing a house without maintaining ventilation lets radon build up. If you have had insulation or new windows fitted, never block permanent wall vents. They are there for a reason.
How to test your home
The process asks nothing of you but patience. A kit contains two passive detectors, plastic discs about the size of your palm. You place one in the main bedroom and one in the living room, then leave them undisturbed for three months. No power, no batteries, no maintenance. You post them back, and the laboratory returns a seasonally adjusted result, so a winter test is not artificially inflated.
Kits cost about €40 to €60 from EPA-registered suppliers, currently including Alpha Radon, Eurofins Environmental Testing Ireland, Radon Aware Group, Radon Ireland, Radonova and RSI Windgap. The EPA does not sell kits itself but maintains the register, and its information line is freephone 1800 300 600 or [email protected]. The reference level for homes is 200 Bq/m³; workplaces have a statutory level of 300 Bq/m³, which matters if you run a business or work from a converted outbuilding.
Fixing a radon problem
A high result is not a reason to panic, and certainly not a reason to move. The options scale with the reading. For moderately raised levels, adding wall vents or trickle vents in window frames can cut concentrations by up to half, typically for a few hundred euro. If your home has a suspended timber floor, clearing blocked airbricks or adding more of them works on the same principle for a similar cost.
For higher readings, a sump is the standard solution. A contractor cuts through the floor slab, excavates a small void beneath it and runs a pipe outside. A passive sump relies on wind and pressure differences, suits levels up to around 400 Bq/m³ and halves radon roughly. An active sump adds a small continuously running fan and cuts levels by around 90%, making it the right answer for seriously elevated results. Expect roughly €1,200, realistically €500 to €2,000, plus about €100 a year in electricity. Whichever route you take, retest afterwards: the EPA offers a free post-remediation test.
Grants and supports
There is no dedicated national grant for radon remediation, which is a genuine gap. However, the Housing Aid for Older People grant, run by your local authority, covers essential repairs for homeowners aged 66 and over, and radon works can qualify. The maximum is €10,700, paid in full where gross household income is up to €37,500 and tapering above that.
If you have smoked, this matters more
Radon and tobacco do not simply add together, they multiply. The WHO estimates that smokers face around 25 times the radon-related lung cancer risk of people who have never smoked. That cuts both ways, encouragingly: stopping reduces risk at any age, including well past 60. The HSE Quitline is freephone 1800 201 203, with free nicotine replacement therapy through the HSE stop smoking service.
Where to start
Check the EPA radon map for your address this week, then order a test kit regardless of what it says, because the map cannot see your foundations. Three months later you will have a number, and either peace of mind or a clear, costed, fixable problem. Very few health risks offer terms that good.
At Críonna Health we think the most valuable health information is the kind you can act on. Testing your home takes ten minutes of effort and roughly the cost of a weekly shop, and it is one of the most straightforward things you can do to protect the years ahead.
General information only, not a substitute for professional advice. For your own home, contact the EPA radon line on 1800 300 600. For health concerns, speak to your GP.
📷 Photo by Clay Banks on Unsplash
