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Domestic Waste Water Treatment Systems 2022

Cork at 11% and Galway at 9% accounted for one fifth of domestic waste water treatment systems in 2022

Online ISSN: 2737-758X
CSO statistical publication, , 11am

Key Findings

  • 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.

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)."

Editor's Note

New registrations may include an element of late registrations.

Tables and Graphs

X-axis labelTotal RegistrationsNew Registrations
2018467.6934.017
2019471.8514.35
2020475.994.157
2021481.6945.481
2022487.4235.675
Table 1 Registrations of Domestic Waste Water Treatment Systems classified by County 2018-2022

Table 2 New Registrations of Domestic Waste Water Treatment Systems classified by County 2018-2022

Table 3 Registrations of Domestic Waste Water Treatment Systems classified by Type of Owner 2022