Radon Results by County

The EPA Office of Radiological Protection, 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 30th June 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 1328 1072 243 13 2300
Cavan 496 479 16 1 900
Clare 4542 3957 484 101 3500
Cork 6324 5530 737 57 4500
Donegal 1751 1661 88 2 3400
Dublin 4366 4122 240 4 1400
Galway 8520 6711 1575 234 5200
Kerry 4497 3743 607 147 49000
Kildare 1542 1475 64 3 1100
Kilkenny 1794 1556 221 17 2400
Laois 646 621 25 0 600
Leitrim 455 423 31 1 1600
Limerick 1589 1472 112 5 1900
Longford 347 305 41 1 900
Louth 1366 1229 134 3 1900
Mayo 4980 4107 798 75 6200
Meath 1205 1117 86 2 900
Monaghan 366 346 20 0 800
Offaly 850 831 19 0 800
Roscommon 800 709 87 4 1400
Sligo 2639 1980 550 109 5600
Tipperary 2862 2517 318 27 3400
Waterford 2774 2224 478 72 9700
Westmeath 909 829 79 1 1100
Wexford 2740 2309 390 41 4100
Wicklow 2561 2146 381 34 16400
Total 62249 53471 7824 954  

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 30th June 2017.