WaterCheck Ireland

Tuam Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Tuam contain 1,135 monitoring results across 69 parameters in 2025.

The separate EPA exceedance dataset contains 2 listed exceedance records across 2 parameters.

The most frequently listed were Coliform Bacteria (1) and Total Organic Carbon (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
Tuam RWSS
Geographic overlap
83.10%
1,135Monitoring results
69Parameters tested
2EPA-listed exceedances
59Samples

The Tuam Built Up Area overlaps Tuam RWSS across approximately 83.10% of its land area.

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

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 median—
2025 maximum—
Measurements in 20256

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; 23 text-only records retained in JSON.

Nitrate

2025 median2.6
2025 maximum6.04
Measurements in 20256

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

12 numeric measurements available; 10 text-only records retained in JSON.

E. coli

2025 median0
2025 maximum0
Measurements in 202559

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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum1 100ml
Measurements in 202559

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.

Open this chart to load the measurements.

Numeric resultEPA-listed exceedance

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

Fluoride

2025 median0.8 mg/l
2025 maximum0.8 mg/l
Measurements in 20256

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; 5 text-only records retained in JSON.

Iron

2025 median18 ug/l
2025 maximum112 ug/l
Measurements in 202559

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

93 numeric measurements available; 190 text-only records retained in JSON.

Arsenic

2025 median1
2025 maximum1
Measurements in 20256

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

4 numeric measurements available; 21 text-only records retained in JSON.

20251,135 results · 2 listed exceedances
Total results — independent scale
0 567.5 1,135 793 2021 893 2022 907 2023 1,122 2024 1,135 2025
Listed exceedances per 1,000 results — independent scale
0.000 4.011 8.021 2.522 2021 2.240 2022 2.205 2023 8.021 2024 1.762 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
2021793526422.522
2022893546422.240
2023907556522.205
20241,122636698.021
20251,135596921.762

Year-to-year detail

2025 compared with 2024

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

Results
20241,122
20251,135
+13
Listed exceedances
20249
20252
-7
Samples
202463
202559
-4
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

1 listed exceedance records / 59 tests1.69%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
1 100ml
Reported limit
0 100ml
Records with this unit/limit pair
1
Latest exceedance
31 Jul 2025

Total Organic Carbon

1 listed exceedance records / 5 tests20.00%

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.

Coliform Bacteria31 Jul 2025
1 100mlReported result
0 100mlReported limit
Tuam RWSSWater supply
JanFebMarAprMayJunJulAugSepOctNovDecColiform BacteriaTotal Organic Carbon31 Jul 2025 — Coliform Bacteria: 1 100ml; reported limit 0; Tuam RWSS; sample 19093807 Jul 2025 — Total Organic Carbon: 20.1 ; reported limit 10; Tuam RWSS; sample 185454

2 listed exceedance records across 2 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.

Tuam RWSS

83.10% geographic overlap with the Tuam Built Up Area.

Technical mapping details
EDEN code
1200PUB1047
Local authority
Galway
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.

69 parameter rows2 listed exceedance records59 samples
Show detailed data69 parameters · 2 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-dichloroethane6014 Oct 20251
2,3,6-trichlorobenzoic acid6014 Oct 20251
2,4-D6014 Oct 20251
Acrylamide6014 Oct 20251
Aluminium58018 Dec 20251
Ammonium6014 Oct 20251
Antimony6014 Oct 20251
Arsenic6014 Oct 20251
Atrazine6014 Oct 20251
Bentazone6014 Oct 20251
Benzene6014 Oct 20251
Benzo(a)pyrene6014 Oct 20251
Bisphenol A6014 Oct 20251
Boron6014 Oct 20251
Bromate6014 Oct 20251
Cadmium6014 Oct 20251
Chlorfenvinphos6014 Oct 20251
Chloride6014 Oct 20251
Chromium6014 Oct 20251
Clopyralid6014 Oct 20251
Clostridium Perfringens6014 Oct 20251
Coliform Bacteria59118 Dec 20251
Colony Count @ 22°C53018 Dec 20251
Colour59018 Dec 20251
Conductivity59018 Dec 20251
Copper6014 Oct 20251
Cyanide6014 Oct 20251
Cypermethrin6014 Oct 20251
Dichlobenil6014 Oct 20251
Dichlorprop6014 Oct 20251
Diflufenican6014 Oct 20251
Diuron6014 Oct 20251
E. coli59018 Dec 20251
Enterococci59018 Dec 20251
Fluoride6014 Oct 20251
Free Chlorine59018 Dec 20251
Glyphosate6014 Oct 20251
Haloacetic acids (Sum of 5 HAAs)6014 Oct 20251
Iron59018 Dec 20251
Isoproturon6014 Oct 20251
Lead6014 Oct 20251
Linuron6014 Oct 20251
Manganese6014 Oct 20251
MCPA6014 Oct 20251
Mecoprop6014 Oct 20251
Mercury6014 Oct 20251
Metaldehyde6014 Oct 20251
Microcystin-LR5014 Oct 20251
Nickel6014 Oct 20251
Nitrate6014 Oct 20251
Nitrite (at tap)6014 Oct 20251
Odour53018 Dec 20251
PAH6014 Oct 20251
Pendimethalin6014 Oct 20251
Pesticides - Total6014 Oct 20251
pH59018 Dec 20251
Propyzamide6014 Oct 20251
Selenium6014 Oct 20251
Simazine6014 Oct 20251
Sodium6014 Oct 20251
Sulphate6014 Oct 20251
Sum of PFAS (sum of 20)6014 Oct 20251
Taste53018 Dec 20251
Tetrachloroethene & Trichloroethene6014 Oct 20251
Total Chlorine59018 Dec 20251
Total Organic Carbon5114 Oct 20251
Triclopyr6014 Oct 20251
Trihalomethanes(Total)6014 Oct 20251
Turbidity (at tap)59018 Dec 20251

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
31 Jul 2025Coliform Bacteria1100ml0Tuam RWSS
1200PUB1047		190938
07 Jul 2025Total Organic Carbon20.1—10Tuam RWSS
1200PUB1047		185454

Common questions

Frequently asked questions

Is Tuam 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 Tuam?

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 Tuam?

In 2025, monitoring data for the Water Supply Zone mapped to Tuam included 1,135 results across 69 parameters. The separate EPA-listed exceedance dataset contains 2 records for those zones in 2025. These figures summarise historical records and are not a current safety verdict.

Who monitors drinking water quality in Tuam?

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 Tuam

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

OranmoreGalway · approximately 28.0 kmGalwayGalway · approximately 28.8 kmLoughreaGalway · approximately 40.0 kmRoscommonRoscommon · approximately 45.7 kmBallinasloeGalway · approximately 46.9 kmCastlebarMayo · approximately 47.6 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 RWSSGalwayTuam RWSSLoughreaTuam RWSS

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Tuam. 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