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Water

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Show Table: 5.1 Ireland: Bathing water quality 2000-2018

Sufficient water qualityGood water quality
200098.461538461538591.5384615384615
200197.709923664122187.7862595419847
200297.709923664122184.7328244274809
200396.946564885496284.7328244274809
200497.709923664122187.7862595419847
200596.183206106870290.8396946564885
200696.946564885496290.0763358778626
200796.946564885496280.1526717557252
200893.129770992366477.8625954198473
200993.129770992366482.4427480916031
201096.990.1
201198.583
20129766.9
201396.884.4
201494.186.7
201593.483.2
201692.985.8
20179384.5
201894.586.2

During the 2000-2018 period more than 80% of bathing sites surveyed in Ireland had good water quality, except for 2008 and 2012. Over 90% of sites surveyed had sufficient water quality over this period.

In 2018, 86.2% of bathing water sites surveyed had good water quality and 94.5% sufficient water quality.

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Show Table: 5.2 Ireland: Drinking water quality 2005-2017

Compliance of public water supplies with THM standardCompliance of public group water supplies with THM standardCompliance of private group water supplies with THM standard
201089.376.285.5
20119187.193.6
20128760.393.8
201392.179.894.4
20149393.193.3
201591.587.295.7
201693.195.790.9
201794.396.696

The quality of public water supplies as measured by compliance with E.Coli standards has increased from an average annual 99.4% in 2005-2009 to 99.9% in 2017. Compliance of Public Group Water Supplies has increased from 99.1% to 99.9%, while compliance of Private Group Water Supplies has increased from 85.6% to 98.9% over the same period.

The compliance rate of Public Water Supply for trihalomethanes (THM) has increased from an average annual 90.5% in 2010-2014 to 94.3% in 2017. The compliance rate of Public Group Water Supplies increased from 79.3% to 96.6%, while the compliance of Private Group Water Supplies increased from 92.1% to 96.0% over the same period.

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Show Table: 5.3 Ireland: Urban waste water treatment 1997-2017

No treatment/preliminary treatmentPrimary treatmentSecondary treatmentSecondary treatment with nutrient reduction
19974628224
19993638215
20013041218
2003312589
20051627012
2007917515
2009617815
20105.91.672.619.9
20115.71.672.120.6
20124.61.571.122.8
20134.61.767.826
20144.61.268.625.7
20154.2168.326.5
20162.71.369.426.6
20172.21.266.630

There has been a significant improvement in the level of treatment of urban waste water in agglomerations of over 500 persons. In 2017, 30% of urban waste water received secondary treatment with nutrient reduction compared with only 6% in 1997-2001. Only 2% of urban waste water received either no treatment or preliminary treatment in 2017, compared with 37% in 1997-2001.

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Show Table: 5.4 Ireland: River water quality 1987-2015

River water quality in Ireland has deteriorated over the 1987-2015 period.

The proportion of unpolluted river water in Ireland fell from 77.3% in 1987-1990 to 68.9% in 2013-2015.

The level of seriously polluted river water has remained at less than 1% over the 1987-2015 period.

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Show Table: 5.5 Ireland: Nitrates in groundwater 1995-2018

There was an improvement in groundwater quality in Ireland as measured by the amount of nitrates detected by monitoring stations over the 1995-2018 period.

The number of samples with less than 5 mg/l NO3 (milligrams per litre of nitrates) in groundwater increased from an average annual 15.6% in 1995-1997 to 26.2% in 2013-2014, before falling to 23.8% in 2017- 2018.

The proportion of samples between 5 and 10 mg/l also increased from an average annual 15.6% in 1995-1997 to 21.6% in 2017-2018.

In contrast, the number of samples with more than 25 mg/l fell from an average annual 19.5% in 1995-1997 to 16.7% in 2017-2018.

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