WaterCheck Ireland

Greystones and Delgany Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Greystones and Delgany contain 662 monitoring results across 67 parameters in 2025.

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

The most frequently listed parameter was Manganese (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
662Monitoring results
67Parameters tested
1EPA-listed exceedances
33Samples

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

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 20254

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

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

Nitrate

2025 median6.75
2025 maximum6.77
Measurements in 20254

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

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

E. coli

2025 median0
2025 maximum0
Measurements in 202533

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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum0 100ml
Measurements in 202533

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

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

Fluoride

2025 median0.62
2025 maximum0.64
Measurements in 20254

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

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

Iron

2025 median25 ug/l
2025 maximum104 ug/l
Measurements in 202533

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

99 numeric measurements available; 91 text-only records retained in JSON.

Arsenic

2025 median—
2025 maximum—
Measurements in 20254

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 numeric measurements available; 22 text-only records retained in JSON.

2025662 results · 1 listed exceedances
Total results — independent scale
0 393 786 687 2021 759 2022 786 2023 786 2024 662 2025
Listed exceedances per 1,000 results — independent scale
0.000 5.089 10.178 4.367 2021 5.270 2022 10.178 2023 1.272 2024 1.511 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
2021687396434.367
2022759406445.270
20237864165810.178
2024786396511.272
2025662336711.511

Year-to-year detail

2025 compared with 2024

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

Results
2024786
2025662
-124
Listed exceedances
20241
20251
0
Samples
202439
202533
-6
Parameters
202465
202567
+2

Parameters with EPA-listed exceedances

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

Manganese

1 listed exceedance records / 4 tests25.00%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
52 ug/l
Reported limit
50 ug/l
Records with this unit/limit pair
1
Latest exceedance
01 Sep 2025

Across the year

When were listed exceedances recorded?

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

Manganese01 Sep 2025
52 ug/lReported result
50 ug/lReported limit
Newtown Newcastle Kilcoole PWSWater supply
JanFebMarAprMayJunJulAugSepOctNovDecManganese01 Sep 2025 — Manganese: 52 ug/l; reported limit 50; Newtown Newcastle Kilcoole PWS; sample 6969/2509618/03

1 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.

GREYSTONES PUBLIC SUPPLY

78.85% geographic overlap with the Greystones and Delgany Built Up Area.

Technical mapping details
EDEN code
3400PUB1003
Local authority
Wicklow
Page totals
Included
Spatial rank
1
Historical EPA scheme
Available
Latest monitoring year
2025
NEWTOWN NEWCASTLE PUBLIC SUPPLY

16.22% geographic overlap with the Greystones and Delgany Built Up Area.

Technical mapping details
EDEN code
3400PUB1010
Local authority
Wicklow
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.

67 parameter rows1 listed exceedance records33 samples
Show detailed data67 parameters · 1 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-dichloroethane4001 Sep 20252
2,3,6-trichlorobenzoic acid4001 Sep 20252
2,4-D4001 Sep 20252
Acrylamide4001 Sep 20252
Aluminium33001 Dec 20252
Ammonium4001 Sep 20252
Antimony4001 Sep 20252
Arsenic4001 Sep 20252
Atrazine4001 Sep 20252
Bentazone4001 Sep 20252
Benzene4001 Sep 20252
Benzo(a)pyrene4001 Sep 20252
Boron4001 Sep 20252
Bromate4001 Sep 20252
Cadmium4001 Sep 20252
Chlorfenvinphos4001 Sep 20252
Chloride4001 Sep 20252
Chromium4001 Sep 20252
Clopyralid4001 Sep 20252
Clostridium Perfringens4001 Sep 20252
Coliform Bacteria33001 Dec 20252
Colony Count @ 22°C29001 Dec 20252
Colour33001 Dec 20252
Conductivity33001 Dec 20252
Copper4001 Sep 20252
Cyanide4001 Sep 20252
Cypermethrin4001 Sep 20252
Dichlobenil4001 Sep 20252
Dichlorprop4001 Sep 20252
Diflufenican4001 Sep 20252
Diuron4001 Sep 20252
E. coli33001 Dec 20252
Enterococci33001 Dec 20252
Fluoride4001 Sep 20252
Free Chlorine33001 Dec 20252
Glyphosate4001 Sep 20252
Haloacetic acids (Sum of 5 HAAs)4001 Sep 20252
Iron33001 Dec 20252
Isoproturon4001 Sep 20252
Lead4001 Sep 20252
Linuron4001 Sep 20252
Manganese4101 Sep 20252
MCPA4001 Sep 20252
Mecoprop4001 Sep 20252
Mercury4001 Sep 20252
Metaldehyde4001 Sep 20252
Nickel4001 Sep 20252
Nitrate4001 Sep 20252
Nitrite (at tap)4001 Sep 20252
Odour29001 Dec 20252
PAH4001 Sep 20252
Pendimethalin4001 Sep 20252
Pesticides - Total4001 Sep 20252
pH33001 Dec 20252
Propyzamide4001 Sep 20252
Selenium4001 Sep 20252
Simazine4001 Sep 20252
Sodium4001 Sep 20252
Sulphate4001 Sep 20252
Sum of PFAS (sum of 20)4001 Sep 20252
Taste29001 Dec 20252
Tetrachloroethene & Trichloroethene4001 Sep 20252
Total Chlorine33001 Dec 20252
Total Organic Carbon4001 Sep 20252
Triclopyr4001 Sep 20252
Trihalomethanes(Total)4001 Sep 20252
Turbidity (at tap)33001 Dec 20252

Showing 67 of 67 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 Sep 2025Manganese52ug/l50Newtown Newcastle Kilcoole PWS
3400PUB1010		6969/2509618/03

Common questions

Frequently asked questions

Is Greystones and Delgany 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 Greystones and Delgany?

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 Greystones and Delgany?

In 2025, monitoring data for 2 Water Supply Zones mapped to Greystones and Delgany included 662 results across 67 parameters. The separate EPA-listed exceedance dataset contains 1 records for those zones in 2025. These figures summarise historical records and are not a current safety verdict.

Who monitors drinking water quality in Greystones and Delgany?

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 Greystones and Delgany

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

BrayWicklow · approximately 7.1 kmWicklowWicklow · approximately 17.8 kmDublinDublin · approximately 25.4 kmRathcooleDublin · approximately 30.7 kmBlessingtonWicklow · approximately 30.9 kmPortmarnockDublin · approximately 31.8 km

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Greystones-Delgany. 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