WaterCheck Ireland

Portarlington Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Portarlington contain 429 monitoring results across 68 parameters in 2025.

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

The most frequently listed parameter was Colony Count @ 22°C (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
429Monitoring results
68Parameters tested
1EPA-listed exceedances
22Samples

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

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 median0.24
2025 maximum0.27
Measurements in 20253

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; 1 text-only records retained in JSON.

Nitrate

2025 median6.37
2025 maximum17.2
Measurements in 20253

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

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

E. coli

2025 median0
2025 maximum0
Measurements in 202522

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

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

Coliform Bacteria

2025 median0
2025 maximum0
Measurements in 202522

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

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

Fluoride

2025 median0.29
2025 maximum0.64
Measurements in 20253

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

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

Iron

2025 median3.9
2025 maximum8
Measurements in 202522

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

33 numeric measurements available; 78 text-only records retained in JSON.

Arsenic

2025 median0.14
2025 maximum0.14
Measurements in 20253

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; 6 text-only records retained in JSON.

2025429 results · 1 listed exceedances
Total results — independent scale
0 275.5 551 387 2021 399 2022 478 2023 551 2024 429 2025
Listed exceedances per 1,000 results — independent scale
0.000 1.166 2.331 0.000 2021 0.000 2022 2.092 2023 0.000 2024 2.331 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
2021387206400.000
2022399216400.000
2023478236512.092
2024551256500.000
2025429226812.331

Year-to-year detail

2025 compared with 2024

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

Results
2024551
2025429
-122
Listed exceedances
20240
20251
+1
Samples
202425
202522
-3
Parameters
202465
202568
+3

Parameters with EPA-listed exceedances

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

Colony Count @ 22°C

1 listed exceedance records / 19 tests5.26%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
121 1ml
Reported limit
100 1ml
Records with this unit/limit pair
1
Latest exceedance
31 Mar 2025

Across the year

When were listed exceedances recorded?

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

Colony Count @ 22°C31 Mar 2025
121 1mlReported result
100 1mlReported limit
Portarlington PWSWater supply
JanFebMarAprMayJunJulAugSepOctNovDecColony Count @ 22°C31 Mar 2025 — Colony Count @ 22°C: 121 1ml; reported limit 100; Portarlington PWS; sample 25340976

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.

Portarlington 1 PWS

59.95% geographic overlap with the Portarlington Built Up Area.

Technical mapping details
EDEN code
1600PUB1100
Local authority
Laois
Page totals
Included
Spatial rank
1
Historical EPA scheme
Available
Latest monitoring year
2025
Portarlington 2 PWS

29.43% geographic overlap with the Portarlington Built Up Area.

Technical mapping details
EDEN code
1600PUB0070
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 rows1 listed exceedance records22 samples
Show detailed data68 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-dichloroethane3017 Nov 20252
2,3,6-trichlorobenzoic acid3017 Nov 20252
2,4-D3017 Nov 20252
Acrylamide3017 Nov 20252
Aluminium4017 Nov 20252
Ammonium3017 Nov 20252
Antimony3017 Nov 20252
Arsenic3017 Nov 20252
Atrazine3017 Nov 20252
Bentazone3017 Nov 20252
Benzene3017 Nov 20252
Benzo(a)pyrene3017 Nov 20252
Bisphenol A3017 Nov 20252
Boron3017 Nov 20252
Bromate3017 Nov 20252
Cadmium3017 Nov 20252
Chlorfenvinphos3017 Nov 20252
Chloride3017 Nov 20252
Chromium3017 Nov 20252
Clopyralid3017 Nov 20252
Clostridium Perfringens3017 Nov 20252
Coliform Bacteria22015 Dec 20252
Colony Count @ 22°C19115 Dec 20252
Colour22015 Dec 20252
Conductivity22015 Dec 20252
Copper3017 Nov 20252
Cyanide3017 Nov 20252
Cypermethrin3017 Nov 20252
Dichlobenil3017 Nov 20252
Dichlorprop3017 Nov 20252
Diflufenican3017 Nov 20252
Diuron3017 Nov 20252
E. coli22015 Dec 20252
Enterococci8017 Nov 20252
Fluoride3017 Nov 20252
Free Chlorine22015 Dec 20252
Glyphosate3017 Nov 20252
Haloacetic acids (Sum of 5 HAAs)3017 Nov 20252
Iron22015 Dec 20252
Isoproturon3017 Nov 20252
Lead3017 Nov 20252
Linuron3017 Nov 20252
Manganese3017 Nov 20252
MCPA3017 Nov 20252
Mecoprop3017 Nov 20252
Mercury3017 Nov 20252
Metaldehyde3017 Nov 20252
Nickel3017 Nov 20252
Nitrate3017 Nov 20252
Nitrite (at tap)3017 Nov 20252
Odour19015 Dec 20252
PAH3017 Nov 20252
Pendimethalin3017 Nov 20252
Pesticides - Total3017 Nov 20252
pH22015 Dec 20252
Propyzamide3017 Nov 20252
Selenium3017 Nov 20252
Simazine3017 Nov 20252
Sodium3017 Nov 20252
Sulphate3017 Nov 20252
Sum of PFAS (sum of 20)3017 Nov 20252
Taste19015 Dec 20252
Tetrachloroethene & Trichloroethene3017 Nov 20252
Total Chlorine22015 Dec 20252
Total Organic Carbon3017 Nov 20252
Triclopyr3017 Nov 20252
Trihalomethanes(Total)3017 Nov 20252
Turbidity (at tap)22015 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
31 Mar 2025Colony Count @ 22°C1211ml100Portarlington PWS
1600PUB1100		25340976

Common questions

Frequently asked questions

Is Portarlington 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 Portarlington?

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 Portarlington?

In 2025, monitoring data for 2 Water Supply Zones mapped to Portarlington included 429 results across 68 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 Portarlington?

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 Portarlington

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

MonasterevinKildare · approximately 8.8 kmPortlaoiseLaois · approximately 15.4 kmKildareKildare · approximately 18.7 kmEdenderryOffaly · approximately 21.9 kmAthyKildare · approximately 23.0 kmTullamoreOffaly · approximately 24.1 km

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Portarlington. 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