WaterCheck Ireland

Maynooth Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Maynooth contain 1,128 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 Enterococci (1), Iron (1) and Sodium (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
Leixlip Regional
Geographic overlap
97.09%
1,128Monitoring results
69Parameters tested
3EPA-listed exceedances
55Samples

The Maynooth Built Up Area overlaps Leixlip Regional across approximately 97.09% of its land area.

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

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 20257

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

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

Nitrate

2025 median6.53
2025 maximum10.58
Measurements in 20257

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

20 numeric measurements available; 5 text-only records retained in JSON.

E. coli

2025 median0
2025 maximum0
Measurements in 202555

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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum0 100ml
Measurements in 202555

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

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

Fluoride

2025 median0.7
2025 maximum0.7
Measurements in 20257

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

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

Iron

2025 median34 ug/l
2025 maximum206 ug/l
Measurements in 202555

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

24 numeric measurements available; 243 text-only records retained in JSON.

Arsenic

2025 median—
2025 maximum—
Measurements in 20257

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; 25 text-only records retained in JSON.

20251,128 results · 3 listed exceedances
Total results — independent scale
0 564 1,128 881 2021 881 2022 977 2023 977 2024 1,128 2025
Listed exceedances per 1,000 results — independent scale
0.000 2.838 5.675 1.135 2021 5.675 2022 3.071 2023 5.118 2024 2.660 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
2021881576411.135
2022881576455.675
2023977546433.071
2024977536455.118
20251,128556932.660

Year-to-year detail

2025 compared with 2024

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

Results
2024977
20251,128
+151
Listed exceedances
20245
20253
-2
Samples
202453
202555
+2
Parameters
202464
202569
+5

Parameters with EPA-listed exceedances

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

Enterococci

1 listed exceedance records / 55 tests1.82%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
3 100ml
Reported limit
0 100ml
Records with this unit/limit pair
1
Latest exceedance
04 Feb 2025

Iron

1 listed exceedance records / 55 tests1.82%

Descriptive frequency of records, not an official compliance measure.

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

Sodium

1 listed exceedance records / 7 tests14.29%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
213.8 mg/l
Reported limit
200 mg/l
Records with this unit/limit pair
1
Latest exceedance
01 Oct 2025

Across the year

When were listed exceedances recorded?

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

Sodium01 Oct 2025
213.8 mg/lReported result
200 mg/lReported limit
Leixlip RegionalWater supply
JanFebMarAprMayJunJulAugSepOctNovDecEnterococciIronSodium01 Oct 2025 — Sodium: 213.8 mg/l; reported limit 200; Leixlip Regional; sample 0844/2510076/0120 Aug 2025 — Iron: 206 ug/l; reported limit 200; Leixlip Regional; sample 0844/2508037/0104 Feb 2025 — Enterococci: 3 100ml; reported limit 0; Leixlip Regional; sample 0844/2502891/02

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.

Leixlip Regional

97.09% geographic overlap with the Maynooth Built Up Area.

Technical mapping details
EDEN code
1400PUB1019
Local authority
Kildare
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 records55 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-dichloroethane7006 Nov 20251
2,3,6-trichlorobenzoic acid7006 Nov 20251
2,4-D7006 Nov 20251
Acrylamide7006 Nov 20251
Aluminium55002 Dec 20251
Ammonium7006 Nov 20251
Antimony7006 Nov 20251
Arsenic7006 Nov 20251
Atrazine7006 Nov 20251
Bentazone7006 Nov 20251
Benzene7006 Nov 20251
Benzo(a)pyrene7006 Nov 20251
Bisphenol A7006 Nov 20251
Boron7006 Nov 20251
Bromate7006 Nov 20251
Cadmium7006 Nov 20251
Chlorfenvinphos7006 Nov 20251
Chloride7006 Nov 20251
Chromium7006 Nov 20251
Clopyralid7006 Nov 20251
Clostridium Perfringens7006 Nov 20251
Coliform Bacteria55002 Dec 20251
Colony Count @ 22°C48002 Dec 20251
Colour55002 Dec 20251
Conductivity55002 Dec 20251
Copper7006 Nov 20251
Cyanide7006 Nov 20251
Cypermethrin7006 Nov 20251
Dichlobenil7006 Nov 20251
Dichlorprop7006 Nov 20251
Diflufenican7006 Nov 20251
Diuron7006 Nov 20251
E. coli55002 Dec 20251
Enterococci55102 Dec 20251
Fluoride7006 Nov 20251
Free Chlorine55002 Dec 20251
Glyphosate7006 Nov 20251
Haloacetic acids (Sum of 5 HAAs)7006 Nov 20251
Iron55102 Dec 20251
Isoproturon7006 Nov 20251
Lead7006 Nov 20251
Linuron7006 Nov 20251
Manganese7006 Nov 20251
MCPA7006 Nov 20251
Mecoprop7006 Nov 20251
Mercury7006 Nov 20251
Metaldehyde7006 Nov 20251
Microcystin-LR1006 Nov 20251
Nickel7006 Nov 20251
Nitrate7006 Nov 20251
Nitrite (at tap)7006 Nov 20251
Odour48002 Dec 20251
PAH7006 Nov 20251
Pendimethalin7006 Nov 20251
Pesticides - Total7006 Nov 20251
pH55002 Dec 20251
Propyzamide7006 Nov 20251
Selenium7006 Nov 20251
Simazine7006 Nov 20251
Sodium7106 Nov 20251
Sulphate7006 Nov 20251
Sum of PFAS (sum of 20)7006 Nov 20251
Taste48002 Dec 20251
Tetrachloroethene & Trichloroethene7006 Nov 20251
Total Chlorine55002 Dec 20251
Total Organic Carbon7006 Nov 20251
Triclopyr7006 Nov 20251
Trihalomethanes(Total)7006 Nov 20251
Turbidity (at tap)55002 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
01 Oct 2025Sodium213.8mg/l200Leixlip Regional
1400PUB1019		0844/2510076/01
20 Aug 2025Iron206ug/l200Leixlip Regional
1400PUB1019		0844/2508037/01
04 Feb 2025Enterococci3100ml0Leixlip Regional
1400PUB1019		0844/2502891/02

Common questions

Frequently asked questions

Is Maynooth 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 Maynooth?

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 Maynooth?

In 2025, monitoring data for the Water Supply Zone mapped to Maynooth included 1,128 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 Maynooth?

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 Maynooth

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

CelbridgeKildare · approximately 5.4 kmKilcockKildare · approximately 5.6 kmLeixlipKildare · approximately 5.8 kmDunboyneMeath · approximately 8.9 kmClaneKildare · approximately 11.6 kmRathcooleDublin · approximately 13.6 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.

CelbridgeLeixlip RegionalLeixlipLeixlip Regional

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Maynooth. 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