This is a point dataset of the waste water treatment plants in agglomerations (towns/cities) with a population equivalent of over 500 during 2006, 2007 and 2008, and were reported on and assessed for compliance under The Urban Waste Water Treatment Regulations, 2001 (S.I. No. 254 of 2001) and 2004 (S.I. 440 of 2004).
https://data.gov.ie/dataset/urban-waste-water-treatment-plant-locations