WaterCheck Ireland

Carlow Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Carlow contain 764 monitoring results across 68 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 Zones
2
764Monitoring results
68Parameters tested
0EPA-listed exceedances
34Samples

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

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 median0.25
2025 maximum0.29
Measurements in 20256

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

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

Nitrate

2025 median11.02
2025 maximum24.71
Measurements in 20256

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

19 numeric measurements available; 7 text-only records retained in JSON.

E. coli

2025 median0
2025 maximum0
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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum0 100ml
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

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

Fluoride

2025 median0.445 mg/l
2025 maximum0.8 mg/l
Measurements in 20256

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

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

Iron

2025 median3 ug/l
2025 maximum22 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

39 numeric measurements available; 135 text-only records retained in JSON.

Arsenic

2025 median0.18
2025 maximum0.26
Measurements in 20256

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

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

2025764 results · 0 listed exceedances
Total results — independent scale
0 382 764 704 2021 688 2022 722 2023 718 2024 764 2025
Listed exceedances per 1,000 results — independent scale
0.000 2.841 5.682 5.682 2021 4.360 2022 4.155 2023 5.571 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
2021704456645.682
2022688416634.360
2023722406534.155
2024718366545.571
2025764346800.000

Year-to-year detail

2025 compared with 2024

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

Results
2024718
2025764
+46
Listed exceedances
20244
20250
-4
Samples
202436
202534
-2
Parameters
202465
202568
+3

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.

Carlow Town

75.50% geographic overlap with the Carlow Built Up Area.

Technical mapping details
EDEN code
0100PUB1001
Local authority
Carlow
Page totals
Included
Spatial rank
1
Historical EPA scheme
Available
Latest monitoring year
2025
Graiguecullen PWS

18.55% geographic overlap with the Carlow Built Up Area.

Technical mapping details
EDEN code
1600PUB1066
Local authority
Laois
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.

68 parameter rows0 listed exceedance records34 samples
Show detailed data68 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-dichloroethane6028 Oct 20252
2,3,6-trichlorobenzoic acid6028 Oct 20252
2,4-D6028 Oct 20252
Acrylamide6028 Oct 20252
Aluminium25004 Dec 20252
Ammonium6028 Oct 20252
Antimony6028 Oct 20252
Arsenic6028 Oct 20252
Atrazine6028 Oct 20252
Bentazone6028 Oct 20252
Benzene6028 Oct 20252
Benzo(a)pyrene6028 Oct 20252
Bisphenol A6028 Oct 20252
Boron6028 Oct 20252
Bromate6028 Oct 20252
Cadmium6028 Oct 20252
Chlorfenvinphos6028 Oct 20252
Chloride6028 Oct 20252
Chromium6028 Oct 20252
Clopyralid6028 Oct 20252
Clostridium Perfringens6028 Oct 20252
Coliform Bacteria34015 Dec 20252
Colony Count @ 22°C28015 Dec 20252
Colour34015 Dec 20252
Conductivity34015 Dec 20252
Copper6028 Oct 20252
Cyanide6028 Oct 20252
Cypermethrin6028 Oct 20252
Dichlobenil6028 Oct 20252
Dichlorprop6028 Oct 20252
Diflufenican6028 Oct 20252
Diuron6028 Oct 20252
E. coli34015 Dec 20252
Enterococci25004 Dec 20252
Fluoride6028 Oct 20252
Free Chlorine34015 Dec 20252
Glyphosate6028 Oct 20252
Haloacetic acids (Sum of 5 HAAs)6028 Oct 20252
Iron34015 Dec 20252
Isoproturon6028 Oct 20252
Lead6028 Oct 20252
Linuron6028 Oct 20252
Manganese6028 Oct 20252
MCPA6028 Oct 20252
Mecoprop6028 Oct 20252
Mercury6028 Oct 20252
Metaldehyde6028 Oct 20252
Nickel6028 Oct 20252
Nitrate6028 Oct 20252
Nitrite (at tap)6028 Oct 20252
Odour28015 Dec 20252
PAH6028 Oct 20252
Pendimethalin6028 Oct 20252
Pesticides - Total6028 Oct 20252
pH34015 Dec 20252
Propyzamide6028 Oct 20252
Selenium6028 Oct 20252
Simazine6028 Oct 20252
Sodium6028 Oct 20252
Sulphate6028 Oct 20252
Sum of PFAS (sum of 20)6028 Oct 20252
Taste28015 Dec 20252
Tetrachloroethene & Trichloroethene6028 Oct 20252
Total Chlorine34015 Dec 20252
Total Organic Carbon6028 Oct 20252
Triclopyr6028 Oct 20252
Trihalomethanes(Total)6028 Oct 20252
Turbidity (at tap)34015 Dec 20252

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
No listed exceedance records available.

Common questions

Frequently asked questions

Is Carlow 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 Carlow?

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 Carlow?

In 2025, monitoring data for 2 Water Supply Zones mapped to Carlow included 764 results across 68 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 Carlow?

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 Carlow

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

TullowCarlow · approximately 13.1 kmAthyKildare · approximately 17.8 kmKilkennyKilkenny · approximately 29.7 kmPortlaoiseLaois · approximately 33.6 kmMonasterevinKildare · approximately 35.2 kmKildareKildare · approximately 36.1 km

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Carlow. 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

Additional spatial intersections (1)

Retained for mapping transparency; excluded from primary monitoring totals.

ZoneEDENClassGeographic overlap
Carlow North Regional0100PUB1142SECONDARY0.953457%