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 2017.

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 - 700 >800  
    Bq/m3 Bq/m3 Bq/m3  
Carlow 1335 1078 244 13 2300
Cavan 500 483 16 1 900
Clare 4552 3964 487 101 3500
Cork 6353 5554 740 59 4500
Donegal 1757 1666 89 2 3400
Dublin 4428 4177 247 4 1400
Galway 8585 6761 1587 237 5200
Kerry 4507 3749 611 147 49000
Kildare 1550 1483 64 3 1100
Kilkenny 1803 1564 222 17 2400
Laois 650 625 25 0 600
Leitrim 455 423 31 1 1600
Limerick 1603 1486 112 5 1900
Longford 350 308 41 1 900
Louth 1376 1236 137 3 1900
Mayo 4998 4122 801 75 6200
Meath 1212 1123 87 2 900
Monaghan 367 347 20 0 800
Offaly 851 832 19 0 800
Roscommon 812 721 87 4 1400
Sligo 2654 1991 552 109 5600
Tipperary 2872 2527 318 27 3400
Waterford 2787 2233 482 72 9700
Westmeath 914 834 79 1 1100
Wexford 2757 2324 392 41 4100
Wicklow 2598 2176 388 34 16400
Total 62626 53787 7878 961  

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.