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 31st December 2016.

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 1310 1055 242 13 2300
Cavan 493 476 16 1 900
Clare 4504 3926 479 99 3500
Cork 6257 5478 723 56 4500
Donegal 1728 1640 86 2 3400
Dublin 4297 4057 236 4 1400
Galway 8422 6637 1556 229 5200
Kerry 4462 3718 602 142 49000
Kildare 1523 1458 62 3 1100
Kilkenny 1776 1543 216 17 2444
Laois 643 618 25 0 565
Leitrim 449 417 31 1 1600
Limerick 1579 1462 112 5 1900
Longford 345 304 40 1 900
Louth 1358 1222 133 3 1900
Mayo 4950 4081 794 75 6200
Meath 1185 1098 85 2 900
Monaghan 365 345 20 0 800
Offaly 845 826 19 0 800
Roscommon 794 704 86 4 1400
Sligo 2614 1960 547 107 5600
Tipperary 2840 2500 313 27 3400
Waterford 2762 2216 474 72 9700
Westmeath 877 797 79 1 1100
Wexford 2712 2284 387 41 4100
Wicklow 2401 2013 357 31 16400
Total 61491 52835 7720 936  

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 2016.