WaterCheck Ireland

Rathcoole Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Rathcoole contain 4,805 monitoring results across 68 parameters in 2025.

The separate EPA exceedance dataset contains 2 listed exceedance records across 1 parameter.

The most frequently listed parameter was Coliform Bacteria (2).

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
SD_ZONE2
Geographic overlap
93.42%
4,805Monitoring results
68Parameters tested
2EPA-listed exceedances
300Samples

The Rathcoole Built Up Area overlaps SD_ZONE2 across approximately 93.42% of its land area.

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

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 median0.265 ug/l
2025 maximum3 ug/l
Measurements in 202512

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; 30 text-only records retained in JSON.

Nitrate

2025 median2.155
2025 maximum4.21
Measurements in 202512

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

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

E. coli

2025 median0
2025 maximum0
Measurements in 2025300

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

1,363 numeric measurements available; 0 text-only records retained in JSON.

Coliform Bacteria

2025 median0 100ml
2025 maximum1 100ml
Measurements in 2025300

2 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

1,363 numeric measurements available; 0 text-only records retained in JSON.

Fluoride

2025 median0.68
2025 maximum0.77
Measurements in 202512

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

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

Iron

2025 median11 ug/l
2025 maximum192 ug/l
Measurements in 2025300

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

1,364 numeric measurements available; 0 text-only records retained in JSON.

Arsenic

2025 median0.24
2025 maximum0.36
Measurements in 202512

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

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

20254,805 results · 2 listed exceedances
Total results — independent scale
0 2,417 4,834 3,137 2021 3,679 2022 4,827 2023 4,834 2024 4,805 2025
Listed exceedances per 1,000 results — independent scale
0.000 0.478 0.956 0.956 2021 0.815 2022 0.414 2023 0.621 2024 0.416 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
20213,1372056430.956
20223,6792436430.815
20234,8273116520.414
20244,8343056530.621
20254,8053006820.416

Year-to-year detail

2025 compared with 2024

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

Results
20244,834
20254,805
-29
Listed exceedances
20243
20252
-1
Samples
2024305
2025300
-5
Parameters
202465
202568
+3

Parameters with EPA-listed exceedances

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

Coliform Bacteria

2 listed exceedance records / 300 tests0.67%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
1 100ml
Reported limit
0 100ml
Records with this unit/limit pair
2
Latest exceedance
24 Nov 2025

Across the year

When were listed exceedances recorded?

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

Coliform Bacteria24 Nov 2025
1 100mlReported result
0 100mlReported limit
South Dublin Zone 2Water supply
JanFebMarAprMayJunJulAugSepOctNovDecColiform Bacteria24 Nov 2025 — Coliform Bacteria: 1 100ml; reported limit 0; South Dublin Zone 2; sample 241116908 Apr 2025 — Coliform Bacteria: 1 100ml; reported limit 0; South Dublin Zone 2; sample 2321258

2 listed exceedance records across 1 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.

SD_ZONE2

93.42% geographic overlap with the Rathcoole Built Up Area.

Technical mapping details
EDEN code
0800PUB1001
Local authority
South Dublin
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.

68 parameter rows2 listed exceedance records300 samples
Show detailed data68 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-dichloroethane12016 Dec 20251
2,3,6-trichlorobenzoic acid12016 Dec 20251
2,4-D12016 Dec 20251
Acrylamide12016 Dec 20251
Aluminium300016 Dec 20251
Ammonium12016 Dec 20251
Antimony12016 Dec 20251
Arsenic12016 Dec 20251
Atrazine12016 Dec 20251
Bentazone12016 Dec 20251
Benzene12016 Dec 20251
Benzo(a)pyrene12016 Dec 20251
Bisphenol A12016 Dec 20251
Boron12016 Dec 20251
Bromate12016 Dec 20251
Cadmium12016 Dec 20251
Chlorfenvinphos12016 Dec 20251
Chloride12016 Dec 20251
Chromium12016 Dec 20251
Clopyralid12016 Dec 20251
Clostridium Perfringens12016 Dec 20251
Coliform Bacteria300216 Dec 20251
Colony Count @ 22°C285015 Dec 20251
Colour300016 Dec 20251
Conductivity300016 Dec 20251
Copper12016 Dec 20251
Cyanide12016 Dec 20251
Cypermethrin12016 Dec 20251
Dichlobenil12016 Dec 20251
Dichlorprop12016 Dec 20251
Diflufenican12016 Dec 20251
Diuron12016 Dec 20251
E. coli300016 Dec 20251
Enterococci300016 Dec 20251
Fluoride12016 Dec 20251
Free Chlorine300016 Dec 20251
Glyphosate12016 Dec 20251
Iron300016 Dec 20251
Isoproturon12016 Dec 20251
Lead12016 Dec 20251
Linuron12016 Dec 20251
Manganese12016 Dec 20251
MCPA12016 Dec 20251
Mecoprop12016 Dec 20251
Mercury12016 Dec 20251
Metaldehyde12016 Dec 20251
Microcystin-LR9016 Dec 20251
Nickel12016 Dec 20251
Nitrate12016 Dec 20251
Nitrite (at tap)12016 Dec 20251
Odour288015 Dec 20251
PAH12016 Dec 20251
Pendimethalin12016 Dec 20251
Pesticides - Total12016 Dec 20251
pH300016 Dec 20251
Propyzamide12016 Dec 20251
Selenium12016 Dec 20251
Simazine12016 Dec 20251
Sodium12016 Dec 20251
Sulphate12016 Dec 20251
Sum of PFAS (sum of 20)12016 Dec 20251
Taste287015 Dec 20251
Tetrachloroethene & Trichloroethene12016 Dec 20251
Total Chlorine300016 Dec 20251
Total Organic Carbon12016 Dec 20251
Triclopyr12016 Dec 20251
Trihalomethanes(Total)12016 Dec 20251
Turbidity (at tap)300016 Dec 20251

Showing 68 of 68 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
24 Nov 2025Coliform Bacteria1100ml0South Dublin Zone 2
0800PUB1001		2411169
08 Apr 2025Coliform Bacteria1100ml0South Dublin Zone 2
0800PUB1001		2321258

Common questions

Frequently asked questions

Is Rathcoole 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 Rathcoole?

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 Rathcoole?

In 2025, monitoring data for the Water Supply Zone mapped to Rathcoole included 4,805 results across 68 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 Rathcoole?

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 Rathcoole

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

CelbridgeKildare · approximately 8.3 kmLeixlipKildare · approximately 10.1 kmBlessingtonWicklow · approximately 13.0 kmSallinsKildare · approximately 13.2 kmMaynoothKildare · approximately 13.6 kmNaasKildare · approximately 14.2 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.

CelbridgeSD_ZONE2DublinSD_ZONE2

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Rathcoole. 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