Radon in Ireland
Official radon data, regulations and resources
National reference level
200 Bq/m³
Competent authority
Regions
An Cabhán
9 municipalities · 1 high-risk
An Longfort
4 municipalities · 2 high-risk
Clare
9 municipalities · 2 high-risk
County Carlow
3 municipalities · 1 high-risk
County Cork
35 municipalities · 24 high-risk
County Donegal
19 municipalities · 5 high-risk
County Galway
14 municipalities · 6 high-risk
County Leitrim
3 municipalities · 1 high-risk
County Monaghan
5 municipalities · 1 high-risk
County Tipperary
13 municipalities · 5 high-risk
County Waterford
6 municipalities · 5 high-risk
Dublin City
19 municipalities
Dún Laoghaire-Rathdown
12 municipalities · 3 high-risk
Fingal County
19 municipalities · 1 high-risk
Kerry
9 municipalities · 5 high-risk
Kildare
25 municipalities · 3 high-risk
Kilkenny
9 municipalities · 2 high-risk
Laois
8 municipalities · 3 high-risk
Limerick City and County Council
14 municipalities · 6 high-risk
Louth
11 municipalities · 2 high-risk
Mayo County
13 municipalities · 9 high-risk
Meath
17 municipalities
Roscommon
4 municipalities · 2 high-risk
Sligo
8 municipalities · 4 high-risk
South Dublin
14 municipalities
Uíbh Fhailí
7 municipalities · 2 high-risk
Westmeath
10 municipalities · 2 high-risk
Wexford
11 municipalities · 4 high-risk
Wicklow
19 municipalities · 3 high-risk
Regulations & obligations
Dwellings
Reference level 200 Bq/m³ for homes (EPA guideline, not legally binding). Measurement and mitigation recommended in high radon areas (>10% homes >200 Bq/m³).
Workplaces
Legal reference level 300 Bq/m³ for workplaces (reduced from 400 Bq/m³ in 2019, IRR19). Mandatory measurement in high radon areas.
New construction
New buildings in high radon areas must include radon barriers and sumps. Building Regulations Part C.
Measurement protocols
Professional services
EPA Registered Radon Testing Services
EPA-registered and INAB ISO 17025-accredited radon testing services
Accredited by: EPA Ireland
EPA Registered Radon Remediation Services
EPA-registered radon remediation services with NRCS training certification
Accredited by: EPA Ireland
INAB-Accredited ISO 17025 Laboratories
INAB-accredited laboratories for radon detector analysis, registered with EPA
Accredited by: INAB
How radon is measured in Ireland
Each country has its own official measurement protocol. Here is how radon testing works according to the national guidelines.
Measurement method
CR-39 alpha-track detectors (passive)
Minimum duration
At least 3 months
Recommended season
Any time of year (3-month minimum covers seasonal variation)
Detector placement
2 detectors per home: 1 in main living room and 1 in main bedroom
Laboratory requirements
EPA-approved radon measurement service
Reference standard: ISO 11665-4 · S.I. No. 30/2019 (European Union BSS Regulations)
How to test for radon yourself
Regardless of where you live, testing for radon is easy and affordable. A long-term measurement with passive detectors is the most reliable way to know your indoor radon level.
Learn how to testMajor Cities
Dublin
1,024,027 inhabitants
Cork
224,004 inhabitants
Limerick
102,287 inhabitants
Galway
85,910 inhabitantsHigh (geology estimate)
Tallaght
81,022 inhabitants
Waterford
60,079 inhabitants
Drogheda
44,135 inhabitants
Dundalk
43,112 inhabitants
Swords
40,776 inhabitants
Navan
33,886 inhabitants
Bray
33,512 inhabitants
Dún Laoghaire
31,239 inhabitantsHigh (geology estimate)
Ennis
27,923 inhabitants
Carlow
27,351 inhabitants
Douglas
26,883 inhabitants
Tralee
26,079 inhabitants
Portlaoise
23,494 inhabitants
Athlone
22,869 inhabitants
Droichead Nua
22,742 inhabitants
An Muileann gCearr
22,667 inhabitants