WaterCheck Ireland

Limerick Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Limerick contain 1,967 monitoring results across 71 parameters in 2025.

The separate EPA exceedance dataset contains 4 listed exceedance records across 4 parameters.

The most frequently listed were Aluminium (1), Colour (1) and Enterococci (1).

These are historical monitoring records and do not confirm the current status of water at a specific address. Current notices are maintained by Uisce Éireann.

Latest monitoring year
2025
Page updated
September 2026
Water Supply Zone
Limerick City Environs PWS
Geographic overlap
74.26%
1,967Monitoring results
71Parameters tested
4EPA-listed exceedances
119Samples

The Limerick Built Up Area overlaps Limerick City Environs PWS across approximately 74.26% of its land area.

Monitoring results apply to the Water Supply Zone as a whole and may include sampling locations outside Limerick.

Selected monitoring data

Key drinking water parameters

Parameters are shown when measurements are available. Text-only and censored values remain unchanged in the detailed history.

Lead

2025 median4.5
2025 maximum7
Measurements in 20258

0 EPA-listed exceedances in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

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Numeric resultEPA-listed exceedance

2 numeric measurements available; 36 text-only records retained in JSON.

Nitrate

2025 median4.78
2025 maximum5.45
Measurements in 20258

0 EPA-listed exceedances in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

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Numeric resultEPA-listed exceedance

20 numeric measurements available; 18 text-only records retained in JSON.

E. coli

2025 median0
2025 maximum0
Measurements in 2025110

0 EPA-listed exceedances in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

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Numeric resultEPA-listed exceedance

557 numeric measurements available; 0 text-only records retained in JSON.

Coliform Bacteria

2025 median0 100ml
2025 maximum0 100ml
Measurements in 2025110

0 EPA-listed exceedances in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

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Numeric resultEPA-listed exceedance

557 numeric measurements available; 0 text-only records retained in JSON.

Fluoride

2025 median0.6
2025 maximum0.7
Measurements in 20258

0 EPA-listed exceedances in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultEPA-listed exceedance

36 numeric measurements available; 1 text-only records retained in JSON.

Iron

2025 median21.5 ug/l
2025 maximum145 ug/l
Measurements in 2025110

0 EPA-listed exceedances in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultEPA-listed exceedance

30 numeric measurements available; 525 text-only records retained in JSON.

Arsenic

2025 median5
2025 maximum5
Measurements in 20258

0 EPA-listed exceedances in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultEPA-listed exceedance

1 numeric measurements available; 37 text-only records retained in JSON.

20251,967 results · 4 listed exceedances
Total results — independent scale
0 1,061 2,122 1,735 2021 2,122 2022 1,836 2023 1,877 2024 1,967 2025
Listed exceedances per 1,000 results — independent scale
0.000 3.299 6.598 4.611 2021 6.598 2022 5.447 2023 4.262 2024 2.034 2025

This is our descriptive frequency: listed exceedance records divided by result records, multiplied by 1,000. It is not an official EPA compliance rate. Differences in sampling volume and parameters tested affect comparisons. A missing denominator is shown as unavailable.

Monitoring history by year
YearResultsSamplesParametersListed exceedancesPer 1,000 results
20211,7351106684.611
20222,12214466146.598
20231,83611567105.447
20241,8771156784.262
20251,9671197142.034

Year-to-year detail

2025 compared with 2024

Changes describe dataset volumes only. The comparison uses the previous available year.

Results
20241,877
20251,967
+90
Listed exceedances
20248
20254
-4
Samples
2024115
2025119
+4
Parameters
202467
202571
+4

Parameters with EPA-listed exceedances

Values and limits are reproduced as reported. Different unit/limit pairs are shown separately.

Aluminium

1 listed exceedance records / 110 tests0.91%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
272 ug/l
Reported limit
200 ug/l
Records with this unit/limit pair
1
Latest exceedance
05 Aug 2025

Colour

1 listed exceedance records / 110 tests0.91%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
20.5 Hazen
Reported limit
20 Hazen
Records with this unit/limit pair
1
Latest exceedance
17 Nov 2025

Enterococci

1 listed exceedance records / 110 tests0.91%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
24 100ml
Reported limit
0 100ml
Records with this unit/limit pair
1
Latest exceedance
06 Oct 2025

Trihalomethanes(Total)

1 listed exceedance records / 8 tests12.50%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
116 ug/l
Reported limit
100 ug/l
Records with this unit/limit pair
1
Latest exceedance
13 Oct 2025

Across the year

When were listed exceedances recorded?

Each point represents one listed exceedance record. Records on the same date remain separate.

Colour17 Nov 2025
20.5 HazenReported result
20 HazenReported limit
Limerick City Environs PWSWater supply
JanFebMarAprMayJunJulAugSepOctNovDecAluminiumColourEnterococciTrihalomethanes(Total)17 Nov 2025 — Colour: 20.5 Hazen; reported limit 20; Limerick City Environs PWS; sample 2537263113 Oct 2025 — Trihalomethanes(Total): 116 ug/l; reported limit 100; Limerick City Environs PWS; sample 2537214506 Oct 2025 — Enterococci: 24 100ml; reported limit 0; Limerick City Environs PWS; sample 2537228505 Aug 2025 — Aluminium: 272 ug/l; reported limit 200; Limerick City Environs PWS; sample 25371729

4 listed exceedance records across 4 parameters in 2025.

Your mapped supply

Water supply

Every Water Supply Zone used for this page's headline figures is included. Geographic overlaps are reported separately and are not added together or weighted by population.

Limerick City Environs PWS

74.26% geographic overlap with the Limerick Built Up Area.

Technical mapping details
EDEN code
1900PUB1032
Local authority
Limerick
Page totals
Included
Spatial rank
1
Historical EPA scheme
Available
Latest monitoring year
2025

Detailed data

The complete parameter and listed exceedance tables for the reporting year.

71 parameter rows4 listed exceedance records119 samples
Show detailed data71 parameters · 4 exceedance records

Complete parameter index

All parameters in 2025

All parameters with test results or listed exceedance records in the latest reporting year
1,2-dichloroethane8013 Oct 20251
2,3,6-trichlorobenzoic acid8013 Oct 20251
2,4-D8013 Oct 20251
Acrylamide8013 Oct 20251
Aluminium110108 Dec 20251
Ammonium8013 Oct 20251
Antimony8013 Oct 20251
Arsenic8013 Oct 20251
Atrazine8013 Oct 20251
Bentazone8013 Oct 20251
Benzene8013 Oct 20251
Benzo(a)pyrene8013 Oct 20251
Bisphenol A1004 Jun 20251
Boron8013 Oct 20251
Bromate8013 Oct 20251
Cadmium8013 Oct 20251
Chlorfenvinphos8013 Oct 20251
Chloride8013 Oct 20251
Chromium8013 Oct 20251
Clopyralid8013 Oct 20251
Clostridium Perfringens8013 Oct 20251
Coliform Bacteria110008 Dec 20251
Colony Count @ 22°C109008 Dec 20251
Colour110108 Dec 20251
Conductivity110008 Dec 20251
Copper8013 Oct 20251
Cryptosporidium9011 Dec 20251
Cyanide8013 Oct 20251
Cypermethrin8013 Oct 20251
Dichlobenil8013 Oct 20251
Dichlorprop8013 Oct 20251
Diflufenican8013 Oct 20251
Diuron8013 Oct 20251
E. coli110008 Dec 20251
Enterococci110108 Dec 20251
Fluoride8013 Oct 20251
Free Chlorine110008 Dec 20251
Giardia9011 Dec 20251
Glyphosate8013 Oct 20251
Haloacetic acids (Sum of 5 HAAs)1004 Jun 20251
Iron110008 Dec 20251
Isoproturon8013 Oct 20251
Lead8013 Oct 20251
Linuron8013 Oct 20251
Manganese8013 Oct 20251
MCPA8013 Oct 20251
Mecoprop8013 Oct 20251
Mercury8013 Oct 20251
Metaldehyde8013 Oct 20251
Microcystin-LR1004 Jun 20251
Nickel8013 Oct 20251
Nitrate8013 Oct 20251
Nitrite (at tap)8013 Oct 20251
Odour109008 Dec 20251
PAH8013 Oct 20251
Pendimethalin8013 Oct 20251
Pesticides - Total8013 Oct 20251
pH110008 Dec 20251
Propyzamide8013 Oct 20251
Selenium8013 Oct 20251
Simazine8013 Oct 20251
Sodium8013 Oct 20251
Sulphate8013 Oct 20251
Sum of PFAS (sum of 20)1004 Jun 20251
Taste109008 Dec 20251
Tetrachloroethene & Trichloroethene8013 Oct 20251
Total Chlorine110008 Dec 20251
Total Organic Carbon8013 Oct 20251
Triclopyr8013 Oct 20251
Trihalomethanes(Total)8113 Oct 20251
Turbidity (at tap)110008 Dec 20251

Showing 71 of 71 parameters.

EPA exceedance dataset

Listed exceedances in 2025

Newest first. Sample IDs distinguish records that may otherwise look identical.

All listed exceedance records in the latest reporting year
DateParameterResultUnitReported limitWater supply / EDENSample ID
17 Nov 2025Colour20.5Hazen20Limerick City Environs PWS
1900PUB1032		25372631
13 Oct 2025Trihalomethanes(Total)116ug/l100Limerick City Environs PWS
1900PUB1032		25372145
06 Oct 2025Enterococci24100ml0Limerick City Environs PWS
1900PUB1032		25372285
05 Aug 2025Aluminium272ug/l200Limerick City Environs PWS
1900PUB1032		25371729

Common questions

Frequently asked questions

Is Limerick tap water safe to drink?

WaterCheck Ireland does not issue a current safe or unsafe verdict. This page presents historical monitoring data. Check Uisce Éireann for any current Boil Water or Do Not Consume notices affecting your address.

Can you drink tap water in Limerick?

WaterCheck Ireland provides historical drinking-water monitoring data, not a current safe or unsafe verdict. For current Boil Water or Do Not Consume notices, check your Eircode with Uisce Éireann.

What is the tap water quality in Limerick?

In 2025, monitoring data for the Water Supply Zone mapped to Limerick included 1,967 results across 71 parameters. The separate EPA-listed exceedance dataset contains 4 records for those zones in 2025. These figures summarise historical records and are not a current safety verdict.

Who monitors drinking water quality in Limerick?

The historical monitoring figures shown here come from drinking-water datasets published by the Environmental Protection Agency (EPA), Ireland. Uisce Éireann operates public water supplies and publishes current supply notices.

What is a Water Supply Zone?

A Water Supply Zone is a defined area supplied by a public drinking-water system. Monitoring records apply to the zone as a whole, so sampling locations can be outside the Census Built Up Area.

What does a listed exceedance mean?

It is a record published in the separate EPA exceedance dataset. WaterCheck Ireland reproduces those records and does not infer additional exceedances or turn the record count into a safety assessment.

How can I check current water notices for my Eircode?

Use your Eircode on the Uisce Éireann website to check current Boil Water and Do Not Consume notices. This page is based on historical monitoring data and is not a live notice service.

Explore nearby reports

Water Quality Near Limerick

Nearest published Built Up Areas, ordered by straight-line distance between Census reference points.

ShannonClare · approximately 17.8 kmEnnisClare · approximately 31.5 kmNenaghTipperary · approximately 36.9 kmNewcastle WestLimerick · approximately 37.1 kmTipperaryTipperary · approximately 37.4 kmThurlesTipperary · approximately 55.0 km

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Limerick city and suburbs. Population refers to the whole Built Up Area.
Supply mapping
Uisce Éireann Water Supply Zone boundaries are matched geographically to the settlement.
Monitoring
EPA monitoring results and the separate listed exceedance dataset, 2021–2025.
Interpretation
Geographic overlap measures land area, not population served; monitoring applies across the full supply zone.

Read the full methodologyView data sources