WaterCheck Ireland

Galway Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Galway contain 3,311 monitoring results across 69 parameters in 2025.

The separate EPA exceedance dataset contains 9 listed exceedance records across 5 parameters.

The most frequently listed were Coliform Bacteria (4), Enterococci (2) and Colour (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 Zones
2
3,311Monitoring results
69Parameters tested
9EPA-listed exceedances
189Samples

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

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 median29.5 ug/l
2025 maximum58 ug/l
Measurements in 202513

1 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

8 numeric measurements available; 49 text-only records retained in JSON.

Nitrate

2025 median2.635
2025 maximum6.04
Measurements in 202513

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

25 numeric measurements available; 29 text-only records retained in JSON.

E. coli

2025 median0
2025 maximum0
Measurements in 2025189

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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum9 100ml
Measurements in 2025188

4 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

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

Fluoride

2025 median0.6 mg/l
2025 maximum0.8 mg/l
Measurements in 202513

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

51 numeric measurements available; 6 text-only records retained in JSON.

Iron

2025 median19 ug/l
2025 maximum165 ug/l
Measurements in 2025189

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

257 numeric measurements available; 562 text-only records retained in JSON.

Arsenic

2025 median1
2025 maximum1
Measurements in 202513

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

7 numeric measurements available; 50 text-only records retained in JSON.

20253,311 results · 9 listed exceedances
Total results — independent scale
0 1,655.5 3,311 2,645 2021 2,586 2022 2,023 2023 3,096 2024 3,311 2025
Listed exceedances per 1,000 results — independent scale
0.000 2.224 4.449 1.890 2021 4.254 2022 4.449 2023 4.199 2024 2.718 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
20212,6451656451.890
20222,58618164114.254
20232,0231226594.449
20243,09618066134.199
20253,3111896992.718

Year-to-year detail

2025 compared with 2024

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

Results
20243,096
20253,311
+215
Listed exceedances
202413
20259
-4
Samples
2024180
2025189
+9
Parameters
202466
202569
+3

Parameters with EPA-listed exceedances

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

Coliform Bacteria

4 listed exceedance records / 188 tests2.13%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
9 100ml
Reported limit
0 100ml
Records with this unit/limit pair
4
Latest exceedance
25 Aug 2025

Enterococci

2 listed exceedance records / 189 tests1.06%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
2 100ml
Reported limit
0 100ml
Records with this unit/limit pair
2
Latest exceedance
05 Nov 2025

Colour

1 listed exceedance records / 189 tests0.53%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
21 Hazen
Reported limit
20 Hazen
Records with this unit/limit pair
1
Latest exceedance
11 Aug 2025

Lead

1 listed exceedance records / 13 tests7.69%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
58 ug/l
Reported limit
10 ug/l
Records with this unit/limit pair
1
Latest exceedance
16 Apr 2025

Total Organic Carbon

1 listed exceedance records / 12 tests8.33%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
20.1
Reported limit
10
Records with this unit/limit pair
1
Latest exceedance
07 Jul 2025

Across the year

When were listed exceedances recorded?

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

Enterococci05 Nov 2025
1 100mlReported result
0 100mlReported limit
Galway City PWSWater supply
JanFebMarAprMayJunJulAugSepOctNovDecColiform BacteriaColourEnterococciLeadTotal Organic Carbon05 Nov 2025 — Enterococci: 1 100ml; reported limit 0; Galway City PWS; sample 20879225 Aug 2025 — Coliform Bacteria: 9 100ml; reported limit 0; Galway City PWS; sample 19175511 Aug 2025 — Colour: 21 Hazen; reported limit 20; Galway City PWS; sample 19262631 Jul 2025 — Coliform Bacteria: 1 100ml; reported limit 0; Tuam RWSS; sample 19093821 Jul 2025 — Coliform Bacteria: 1 100ml; reported limit 0; Galway City PWS; sample 18821321 Jul 2025 — Coliform Bacteria: 1 100ml; reported limit 0; Galway City PWS; sample 18821407 Jul 2025 — Total Organic Carbon: 20.1 ; reported limit 10; Tuam RWSS; sample 18545402 Jul 2025 — Enterococci: 2 100ml; reported limit 0; Galway City PWS; sample 18450816 Apr 2025 — Lead: 58 ug/l; reported limit 10; Galway City PWS; sample 172300

9 listed exceedance records across 5 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.

Galway City Council Public Water S.S.

62.15% geographic overlap with the Galway Built Up Area.

Technical mapping details
EDEN code
1100PUB1001
Local authority
Galway City
Page totals
Included
Spatial rank
1
Historical EPA scheme
Available
Latest monitoring year
2025
Tuam RWSS

8.96% geographic overlap with the Galway Built Up Area.

Technical mapping details
EDEN code
1200PUB1047
Local authority
Galway
Page totals
Included
Spatial rank
2
Historical EPA scheme
Available
Latest monitoring year
2025

Detailed data

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

69 parameter rows9 listed exceedance records189 samples
Show detailed data69 parameters · 9 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-dichloroethane13010 Nov 20252
2,3,6-trichlorobenzoic acid13010 Nov 20252
2,4-D13010 Nov 20252
Acrylamide13010 Nov 20252
Aluminium188018 Dec 20252
Ammonium13010 Nov 20252
Antimony13010 Nov 20252
Arsenic13010 Nov 20252
Atrazine13010 Nov 20252
Bentazone13010 Nov 20252
Benzene13010 Nov 20252
Benzo(a)pyrene13010 Nov 20252
Bisphenol A12010 Nov 20252
Boron13010 Nov 20252
Bromate13010 Nov 20252
Cadmium13010 Nov 20252
Chlorfenvinphos13010 Nov 20252
Chloride13010 Nov 20252
Chromium13010 Nov 20252
Clopyralid13010 Nov 20252
Clostridium Perfringens13010 Nov 20252
Coliform Bacteria188418 Dec 20252
Colony Count @ 22°C176018 Dec 20252
Colour189118 Dec 20252
Conductivity189018 Dec 20252
Copper13010 Nov 20252
Cyanide13010 Nov 20252
Cypermethrin13010 Nov 20252
Dichlobenil13010 Nov 20252
Dichlorprop13010 Nov 20252
Diflufenican13010 Nov 20252
Diuron13010 Nov 20252
E. coli189018 Dec 20252
Enterococci189218 Dec 20252
Fluoride13010 Nov 20252
Free Chlorine189018 Dec 20252
Glyphosate13010 Nov 20252
Haloacetic acids (Sum of 5 HAAs)12010 Nov 20252
Iron189018 Dec 20252
Isoproturon13010 Nov 20252
Lead13110 Nov 20252
Linuron13010 Nov 20252
Manganese13010 Nov 20252
MCPA13010 Nov 20252
Mecoprop13010 Nov 20252
Mercury13010 Nov 20252
Metaldehyde13010 Nov 20252
Microcystin-LR8010 Nov 20252
Nickel13010 Nov 20252
Nitrate13010 Nov 20252
Nitrite (at tap)13010 Nov 20252
Odour176018 Dec 20252
PAH13010 Nov 20252
Pendimethalin13010 Nov 20252
Pesticides - Total13010 Nov 20252
pH189018 Dec 20252
Propyzamide13010 Nov 20252
Selenium13010 Nov 20252
Simazine13010 Nov 20252
Sodium13010 Nov 20252
Sulphate13010 Nov 20252
Sum of PFAS (sum of 20)12010 Nov 20252
Taste176018 Dec 20252
Tetrachloroethene & Trichloroethene13010 Nov 20252
Total Chlorine189018 Dec 20252
Total Organic Carbon12110 Nov 20252
Triclopyr13010 Nov 20252
Trihalomethanes(Total)13010 Nov 20252
Turbidity (at tap)189018 Dec 20252

Showing 69 of 69 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
05 Nov 2025Enterococci1100ml0Galway City PWS
1100PUB1001		208792
25 Aug 2025Coliform Bacteria9100ml0Galway City PWS
1100PUB1001		191755
11 Aug 2025Colour21Hazen20Galway City PWS
1100PUB1001		192626
31 Jul 2025Coliform Bacteria1100ml0Tuam RWSS
1200PUB1047		190938
21 Jul 2025Coliform Bacteria1100ml0Galway City PWS
1100PUB1001		188213
21 Jul 2025Coliform Bacteria1100ml0Galway City PWS
1100PUB1001		188214
07 Jul 2025Total Organic Carbon20.1—10Tuam RWSS
1200PUB1047		185454
02 Jul 2025Enterococci2100ml0Galway City PWS
1100PUB1001		184508
16 Apr 2025Lead58ug/l10Galway City PWS
1100PUB1001		172300

Common questions

Frequently asked questions

Is Galway 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 Galway?

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 Galway?

In 2025, monitoring data for 2 Water Supply Zones mapped to Galway included 3,311 results across 69 parameters. The separate EPA-listed exceedance dataset contains 9 records for those zones in 2025. These figures summarise historical records and are not a current safety verdict.

Who monitors drinking water quality in Galway?

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 Galway

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

OranmoreGalway · approximately 7.8 kmTuamGalway · approximately 28.8 kmLoughreaGalway · approximately 32.9 kmEnnisClare · approximately 49.3 kmBallinasloeGalway · approximately 55.1 kmWestportMayo · approximately 65.2 km

Connected by mapped supply

Places sharing this Water Supply Zone

These published places share at least one Water Supply Zone used in this page's headline figures.

OranmoreTuam RWSSTuamTuam RWSSLoughreaTuam RWSS

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Galway 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