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The number of registered domestic waste water treatment systems in Ireland increased by 1% to 481,694 in 2021.
Six coastal counties accounted for 45% of registrations in 2021.
In 2021 Cork had the highest proportion of domestic waste water treatment systems at 11% and new registrations at 12%.
Household owners accounted for 97% of all registered waste water treatment systems in 2021.
| X-axis label | Total Registrations | New Registrations |
|---|---|---|
| 2017 | 463.438 | 3.562 |
| 2018 | 467.693 | 4.017 |
| 2019 | 471.851 | 4.350 |
| 2020 | 475.990 | 4.157 |
| 2021 | 481.694 | 5.481 |
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Statistician's Comment
Linh Nolan, Statistician in the Environment and Climate Division of the CSO, noted that: "The number of registered domestic waste water treatment systems increased by 1% in 2021 to 481,694. There was an increase in every local authority in 2021 with Donegal, Dublin and Wexford recording the highest annual increase of approximately 2% each.
In 2021 Cork had the highest proportion of domestic waste water treatment systems at 11% followed by Galway (9%) and Kerry (7%). Next were Donegal, Mayo and Tipperary at 6% each and Wexford at 5%. These seven counties accounted for approximately 50% of all individual waste water treatment systems.
Cork accounted for 12% of all new registrations in 2021 followed by Galway and Donegal (8% each).
Household owners accounted for 97% of all registered waste water treatment systems in 2021. Public authorities accounted for 1.5% and Other non-domestic owners accounted for the remaining 1.4%. In Longford public authorities accounted for 4% of all owners in 2021 whereas in Kildare they only accounted for 0.1%."
Note: New registrations may include an element of late registrations.
See PxStat tables here.