There were over 30,000 wastewater treatment systems in Laois, Offaly and Westmeath at the end of 2022, according to the CSO.
The midlands accounted for just over 5% of new waste water treatment systems in 2022.
345 new systems were registered in the region last year, according to new figures from the CSO.
As of the end of 2022, there were 32,150 registered domestic waste water treatment systems in the midlands - 12,070 of those are in Westmeath, 10,086 in Laois and 9,994 are in Offaly.
Nationally, there was a 1.2% increase in the number of waste water treatment systems.
Almost €446,000 Allocated To Midlands Community Centres And Clubhouses
Two People Killed In Offaly Following Fatal Crash
Midlands Family Takes On Ireland’s Fittest Family Challenge
5K Fundraiser To Support Motor Neurone Disease Association Takes Place In Westmeath
No Slowing Down With Age As Westmeath Bowlers Shine At 14th Annual National Bowls Competition
Woman Appears In Court Over €280k Cannabis Seizure In Midlands
Status Yellow Fog Warning Issued For Leinster, Munster And Galway
Call For More Public Toilets Across The Midlands And Beyond