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 2019.

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 1364 1102 249 13 2300
Cavan 509 491 17 1 900
Clare 4598 3999 496 103 3500
Cork 6469 5649 758 62 4500
Donegal 1784 1692 90 2 3400
Down 1 1 0 0 13
Dublin 4627 4371 252 4 1400
Galway 8776 6915 1619 242 5200
Kerry 4562 3792 618 152 49000
Kildare 1600 1531 66 3 1100
Kilkenny 1823 1581 225 17 2400
Laois 659 634 25 0 600
Leitrim 462 430 31 1 1600
Limerick 1652 1529 117 6 1900
Longford 354 312 41 1 900
Louth 1397 1256 138 3 1900
Mayo 5076 4181 818 77 6200
Meath 1250 1157 91 2 900
Monaghan 372 352 20 0 800
Offaly 858 838 20 0 800
Roscommon 825 732 89 4 1400
Sligo

2698

2025 560 111 5600
Tipperary 2907 2551 329 27 3400
Waterford 2840 2279 489 72 9700
Westmeath 965 885 79 1 1100
Wexford 2803 2357 404 42 4100
Wicklow 2683 2248 401 34 16400
Total 63914 54890 8043 981  

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 2019.