Radon Results by County

The EPA Office of Radiation Protection and Environmental Monitoring, formerly the Radiological Protection Institute of Ireland (RPII) has measured more than 60,000 homes in Ireland since establishing its radon measurement programme in the early 1990s.

The following table gives summary results of the radon measurements carried out in each county up to 31st December 2018.

The national Reference Level for radon in the home is 200 becquerel per cubic metre (Bq/m3).

This is the level at which it is recommended that you take action to reduce the level of radon in your home.

County

Number of houses measured

Number of houses in categories of radon concentration  Max (Bq/m3)
    0 - 199 200 - 799 >800  
    Bq/m3 Bq/m3 Bq/m3  
Carlow 1362 1102 247 13 2300
Cavan 506 488 17 1 900
Clare 4592 3994 495 103 3500
Cork 6457 5638 758 61 4500
Donegal 1781 1689 90 2 3400
Down 1 1 0 0 13
Dublin 4594 4339 251 4 1400
Galway 8749 6893 1614 242 5200
Kerry 4558 3788 618 152 49000
Kildare 1593 1525 65 3 1100
Kilkenny 1820 1578 225 17 2400
Laois 658 633 25 0 600
Leitrim 462 430 31 1 1600
Limerick 1634 1514 115 5 1900
Longford 353 311 41 1 900
Louth 1394 1253 138 3 1900
Mayo 5067 4172 818 77 6200
Meath 1248 1156 90 2 900
Monaghan 372 352 20 0 800
Offaly 858 838 20 0 800
Roscommon 824 731 89 4 1400
Sligo 2694 2023 559 110 5600
Tipperary 2906 2551 328 27 3400
Waterford 2835 2274 489 72 9700
Westmeath 952 872 79 1 1100
Wexford 2794 2352 400 42 4100
Wicklow 2678 2244 400 34 16400
Total 63742 54741 8022 979  

Notes

  • The EPA database consists of 11,319 measurements undertaken as part of the National Radon Survey (NRS) and over 50,000 other measurements.
  • NRS measurements were made for a continuous 12-month period. All other measurements were made for a minimum period of three months and were seasonally adjusted.
  • All measurements have been made in accordance with a standard measurement protocol. Where there are duplicate measurements for any home, only the first measurement was used.
  • All post-remediation measurements have been disregarded.
  • Measurements made by other radon measurement services are not included.
  • The maximum measurement for each county has been rounded to the nearest 100.
  • Data compiled up to 31st December 2017.