WaterCheck Ireland

Nenagh Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Nenagh contain 632 monitoring results across 69 parameters in 2025.

The separate EPA exceedance dataset contains 3 listed exceedance records across 3 parameters.

The most frequently listed were Coliform Bacteria (1), E. coli (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
Nenagh RWSS
Geographic overlap
72.04%
632Monitoring results
69Parameters tested
3EPA-listed exceedances
34Samples

The Nenagh Built Up Area overlaps Nenagh RWSS across approximately 72.04% of its land area.

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

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 median1
2025 maximum1
Measurements in 20253

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; 13 text-only records retained in JSON.

Nitrate

2025 median5.75
2025 maximum8.72
Measurements in 20253

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

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

E. coli

2025 median0 100ml
2025 maximum100 100ml
Measurements in 202534

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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum100 100ml
Measurements in 202534

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

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

Fluoride

2025 median0.6
2025 maximum0.6
Measurements in 20253

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

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

Iron

2025 median53 ug/l
2025 maximum191 ug/l
Measurements in 202534

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

34 numeric measurements available; 107 text-only records retained in JSON.

Arsenic

2025 median—
2025 maximum—
Measurements in 20253

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

0 numeric measurements available; 15 text-only records retained in JSON.

2025632 results · 3 listed exceedances
Total results — independent scale
0 316 632 487 2021 500 2022 559 2023 566 2024 632 2025
Listed exceedances per 1,000 results — independent scale
0.000 3.080 6.160 6.160 2021 0.000 2022 0.000 2023 3.534 2024 4.747 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
2021487346636.160
2022500356600.000
2023559386700.000
2024566406723.534
2025632346934.747

Year-to-year detail

2025 compared with 2024

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

Results
2024566
2025632
+66
Listed exceedances
20242
20253
+1
Samples
202440
202534
-6
Parameters
202467
202569
+2

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 / 34 tests2.94%

Descriptive frequency of records, not an official compliance measure.

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

E. coli

1 listed exceedance records / 34 tests2.94%

Descriptive frequency of records, not an official compliance measure.

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

Enterococci

1 listed exceedance records / 34 tests2.94%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
100 100ml
Reported limit
0 100ml
Records with this unit/limit pair
1
Latest exceedance
21 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 Bacteria21 Jul 2025
100 100mlReported result
0 100mlReported limit
Nenagh RWSSWater supply
JanFebMarAprMayJunJulAugSepOctNovDecColiform BacteriaE. coliEnterococci21 Jul 2025 — Coliform Bacteria: 100 100ml; reported limit 0; Nenagh RWSS; sample 8671/2507525/0321 Jul 2025 — E. coli: 100 100ml; reported limit 0; Nenagh RWSS; sample 8671/2507525/0321 Jul 2025 — Enterococci: 100 100ml; reported limit 0; Nenagh RWSS; sample 8671/2507525/03

3 listed exceedance records across 3 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.

Nenagh RWSS

72.04% geographic overlap with the Nenagh Built Up Area.

Technical mapping details
EDEN code
2800PUB1008
Local authority
Tipperary
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 rows3 listed exceedance records34 samples
Show detailed data69 parameters · 3 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-dichloroethane3005 Nov 20251
2,3,6-trichlorobenzoic acid3005 Nov 20251
2,4-D3005 Nov 20251
Acrylamide3005 Nov 20251
Aluminium34009 Dec 20251
Ammonium3005 Nov 20251
Antimony3005 Nov 20251
Arsenic3005 Nov 20251
Atrazine3005 Nov 20251
Bentazone3005 Nov 20251
Benzene3005 Nov 20251
Benzo(a)pyrene3005 Nov 20251
Bisphenol A3005 Nov 20251
Boron3005 Nov 20251
Bromate3005 Nov 20251
Cadmium3005 Nov 20251
Chlorfenvinphos3005 Nov 20251
Chloride3005 Nov 20251
Chromium3005 Nov 20251
Clopyralid3005 Nov 20251
Clostridium Perfringens3005 Nov 20251
Coliform Bacteria34109 Dec 20251
Colony Count @ 22°C31009 Dec 20251
Colour34009 Dec 20251
Conductivity34009 Dec 20251
Copper3005 Nov 20251
Cyanide3005 Nov 20251
Cypermethrin3005 Nov 20251
Dichlobenil3005 Nov 20251
Dichlorprop3005 Nov 20251
Diflufenican3005 Nov 20251
Diuron3005 Nov 20251
E. coli34109 Dec 20251
Enterococci34109 Dec 20251
Fluoride3005 Nov 20251
Free Chlorine34009 Dec 20251
Glyphosate3005 Nov 20251
Haloacetic acids (Sum of 5 HAAs)3005 Nov 20251
Iron34009 Dec 20251
Isoproturon3005 Nov 20251
Lead3005 Nov 20251
Linuron3005 Nov 20251
Manganese3005 Nov 20251
MCPA3005 Nov 20251
Mecoprop3005 Nov 20251
Mercury3005 Nov 20251
Metaldehyde3005 Nov 20251
Microcystin-LR3005 Nov 20251
Nickel3005 Nov 20251
Nitrate3005 Nov 20251
Nitrite (at tap)3005 Nov 20251
Odour31009 Dec 20251
PAH3005 Nov 20251
Pendimethalin3005 Nov 20251
Pesticides - Total3005 Nov 20251
pH34009 Dec 20251
Propyzamide3005 Nov 20251
Selenium3005 Nov 20251
Simazine3005 Nov 20251
Sodium3005 Nov 20251
Sulphate3005 Nov 20251
Sum of PFAS (sum of 20)3005 Nov 20251
Taste31009 Dec 20251
Tetrachloroethene & Trichloroethene3005 Nov 20251
Total Chlorine34009 Dec 20251
Total Organic Carbon3005 Nov 20251
Triclopyr3005 Nov 20251
Trihalomethanes(Total)3005 Nov 20251
Turbidity (at tap)34009 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
21 Jul 2025Coliform Bacteria100100ml0Nenagh RWSS
2800PUB1008		8671/2507525/03
21 Jul 2025E. coli100100ml0Nenagh RWSS
2800PUB1008		8671/2507525/03
21 Jul 2025Enterococci100100ml0Nenagh RWSS
2800PUB1008		8671/2507525/03

Common questions

Frequently asked questions

Is Nenagh 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 Nenagh?

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 Nenagh?

In 2025, monitoring data for the Water Supply Zone mapped to Nenagh included 632 results across 69 parameters. The separate EPA-listed exceedance dataset contains 3 records for those zones in 2025. These figures summarise historical records and are not a current safety verdict.

Who monitors drinking water quality in Nenagh?

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 Nenagh

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

RoscreaTipperary · approximately 28.8 kmThurlesTipperary · approximately 33.3 kmLimerickLimerick · approximately 36.9 kmTipperaryTipperary · approximately 43.5 kmLoughreaGalway · approximately 44.8 kmShannonClare · approximately 48.7 km

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Nenagh. 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