WaterCheck Ireland

Arklow Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Arklow contain 334 monitoring results across 66 parameters in 2025.

The separate EPA exceedance dataset contains no listed exceedance records for the mapped Water Supply Zones in 2025.

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
ARKLOW PUBLIC SUPPLY
Geographic overlap
86.22%
334Monitoring results
66Parameters tested
0EPA-listed exceedances
18Samples

The Arklow Built Up Area overlaps ARKLOW PUBLIC SUPPLY across approximately 86.22% of its land area.

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

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 20252

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; 9 text-only records retained in JSON.

Nitrate

2025 median7.74
2025 maximum7.76
Measurements in 20252

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; 0 text-only records retained in JSON.

E. coli

2025 median0
2025 maximum0
Measurements in 202518

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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum0 100ml
Measurements in 202518

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

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

Fluoride

2025 median0.73
2025 maximum0.78
Measurements in 20252

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

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

Iron

2025 median22 ug/l
2025 maximum149 ug/l
Measurements in 202518

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

32 numeric measurements available; 65 text-only records retained in JSON.

Arsenic

2025 median—
2025 maximum—
Measurements in 20252

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; 12 text-only records retained in JSON.

2025334 results · 0 listed exceedances
Total results — independent scale
0 238 476 369 2021 330 2022 334 2023 476 2024 334 2025
Listed exceedances per 1,000 results — independent scale
0.000 6.061 12.121 0.000 2021 12.121 2022 5.988 2023 10.504 2024 0.000 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
2021369216400.000
20223301864412.121
2023334196425.988
20244762264510.504
2025334186600.000

Year-to-year detail

2025 compared with 2024

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

Results
2024476
2025334
-142
Listed exceedances
20245
20250
-5
Samples
202422
202518
-4
Parameters
202464
202566
+2

Parameters with EPA-listed exceedances

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

No listed exceedance records are available for this reporting year.

Across the year

When were listed exceedances recorded?

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

No listed exceedance records to plot.

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.

ARKLOW PUBLIC SUPPLY

86.22% geographic overlap with the Arklow Built Up Area.

Technical mapping details
EDEN code
3400PUB1004
Local authority
Wicklow
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.

66 parameter rows0 listed exceedance records18 samples
Show detailed data66 parameters · 0 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-dichloroethane2003 Sep 20251
2,3,6-trichlorobenzoic acid2003 Sep 20251
2,4-D2003 Sep 20251
Aluminium2003 Sep 20251
Ammonium2003 Sep 20251
Antimony2003 Sep 20251
Arsenic2003 Sep 20251
Atrazine2003 Sep 20251
Bentazone2003 Sep 20251
Benzene2003 Sep 20251
Benzo(a)pyrene2003 Sep 20251
Boron2003 Sep 20251
Bromate2003 Sep 20251
Cadmium2003 Sep 20251
Chlorfenvinphos2003 Sep 20251
Chloride2003 Sep 20251
Chromium2003 Sep 20251
Clopyralid2003 Sep 20251
Clostridium Perfringens2003 Sep 20251
Coliform Bacteria18003 Dec 20251
Colony Count @ 22°C16003 Dec 20251
Colour18003 Dec 20251
Conductivity18003 Dec 20251
Copper2003 Sep 20251
Cyanide2003 Sep 20251
Cypermethrin2003 Sep 20251
Dichlobenil2003 Sep 20251
Dichlorprop2003 Sep 20251
Diflufenican2003 Sep 20251
Diuron2003 Sep 20251
E. coli18003 Dec 20251
Enterococci18003 Dec 20251
Fluoride2003 Sep 20251
Free Chlorine18003 Dec 20251
Glyphosate2003 Sep 20251
Haloacetic acids (Sum of 5 HAAs)2003 Sep 20251
Iron18003 Dec 20251
Isoproturon2003 Sep 20251
Lead2003 Sep 20251
Linuron2003 Sep 20251
Manganese2003 Sep 20251
MCPA2003 Sep 20251
Mecoprop2003 Sep 20251
Mercury2003 Sep 20251
Metaldehyde2003 Sep 20251
Nickel2003 Sep 20251
Nitrate2003 Sep 20251
Nitrite (at tap)2003 Sep 20251
Odour16003 Dec 20251
PAH2003 Sep 20251
Pendimethalin2003 Sep 20251
Pesticides - Total2003 Sep 20251
pH18003 Dec 20251
Propyzamide2003 Sep 20251
Selenium2003 Sep 20251
Simazine2003 Sep 20251
Sodium2003 Sep 20251
Sulphate2003 Sep 20251
Sum of PFAS (sum of 20)2003 Sep 20251
Taste16003 Dec 20251
Tetrachloroethene & Trichloroethene2003 Sep 20251
Total Chlorine18003 Dec 20251
Total Organic Carbon2003 Sep 20251
Triclopyr2003 Sep 20251
Trihalomethanes(Total)2003 Sep 20251
Turbidity (at tap)18003 Dec 20251

Showing 66 of 66 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
No listed exceedance records available.

Common questions

Frequently asked questions

Is Arklow 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 Arklow?

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 Arklow?

In 2025, monitoring data for the Water Supply Zone mapped to Arklow included 334 results across 66 parameters. The separate EPA-listed exceedance dataset contains 0 records for those zones in 2025. These figures summarise historical records and are not a current safety verdict.

Who monitors drinking water quality in Arklow?

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 Arklow

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

GoreyWexford · approximately 16.1 kmWicklowWicklow · approximately 21.6 kmGreystones and DelganyWicklow · approximately 38.4 kmTullowCarlow · approximately 38.9 kmEnniscorthyWexford · approximately 42.8 kmBrayWicklow · approximately 44.9 km

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Arklow. 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