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The number of registered domestic waste water treatment systems in Ireland increased by 1.2% to 487,423 in 2022.
In 2022, Cork and Galway had the highest proportion of domestic waste water treatment systems at 11% and 9%, respectively.
Seven counties accounted for just over half of all registrations in 2022.
Household owners accounted for 97% of all registered waste water treatment systems in 2022.
New registrations may include an element of late registrations.
| X-axis label | Total Registrations | New Registrations |
|---|---|---|
| 2018 | 467.693 | 4.017 |
| 2019 | 471.851 | 4.35 |
| 2020 | 475.99 | 4.157 |
| 2021 | 481.694 | 5.481 |
| 2022 | 487.423 | 5.675 |
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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 1.2% in 2022 to 487,423 (see Figure 1 and Table 1). There was an increase in every local authority in 2022 with Wexford and Leitrim recording the highest annual increase of approximately 2% each.
In 2022, with 55,700 registered domestic waste water treatment systems, Cork had the highest proportion of 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 just over half of all individual waste water treatment systems (see Figure 2 and Table 1).
Cork accounted for 11% of all new registrations in 2022 followed by Galway and Donegal (8% each) (see Table 2).
Household owners accounted for 97% of all registered waste water treatment systems in 2022. 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 2022 whereas in Kildare they only accounted for 0.1% (see Table 3)."