WaterCheck Ireland

Roscommon Tap Water Quality

EPA monitoring records for Water Supply Zones mapped to Roscommon contain 313 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 Lead (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 Zone
Roscommon Central WSS
Geographic overlap
99.52%
313Monitoring results
68Parameters tested
1EPA-listed exceedances
15Samples

The Roscommon Built Up Area overlaps Roscommon Central WSS across approximately 99.52% of its land area.

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

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 median89 ug/l
2025 maximum89 ug/l
Measurements in 20252

1 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

2 numeric measurements available; 8 text-only records retained in JSON.

Nitrate

2025 median10
2025 maximum11
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

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

E. coli

2025 median0
2025 maximum0
Measurements in 202515

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

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

Coliform Bacteria

2025 median0 100ml
2025 maximum0 100ml
Measurements in 202515

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

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

Fluoride

2025 median0.7 mg/l
2025 maximum0.8 mg/l
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

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

Iron

2025 median21
2025 maximum21
Measurements in 202515

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

5 numeric measurements available; 69 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

1 numeric measurements available; 9 text-only records retained in JSON.

2025313 results · 1 listed exceedances
Total results — independent scale
0 156.5 313 291 2021 291 2022 305 2023 295 2024 313 2025
Listed exceedances per 1,000 results — independent scale
0.000 3.390 6.780 3.436 2021 0.000 2022 0.000 2023 6.780 2024 3.195 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
2021291156413.436
2022291156400.000
2023305156500.000
2024295146526.780
2025313156813.195

Year-to-year detail

2025 compared with 2024

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

Results
2024295
2025313
+18
Listed exceedances
20242
20251
-1
Samples
202414
202515
+1
Parameters
202465
202568
+3

Parameters with EPA-listed exceedances

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

Lead

1 listed exceedance records / 2 tests50.00%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
89 ug/l
Reported limit
10 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.

Lead01 Sep 2025
89 ug/lReported result
10 ug/lReported limit
Roscommon Central Water Supply SchemeWater supply
JanFebMarAprMayJunJulAugSepOctNovDecLead01 Sep 2025 — Lead: 89 ug/l; reported limit 10; Roscommon Central Water Supply Scheme; sample 25444819

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.

Roscommon Central WSS

99.52% geographic overlap with the Roscommon Built Up Area.

Technical mapping details
EDEN code
2600PUB1002
Local authority
Roscommon
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 rows1 listed exceedance records15 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-dichloroethane2001 Sep 20251
2,3,6-trichlorobenzoic acid2001 Sep 20251
2,4-D2001 Sep 20251
Acrylamide2001 Sep 20251
Aluminium15001 Dec 20251
Ammonium2001 Sep 20251
Antimony2001 Sep 20251
Arsenic2001 Sep 20251
Atrazine2001 Sep 20251
Bentazone2001 Sep 20251
Benzene2001 Sep 20251
Benzo(a)pyrene2001 Sep 20251
Bisphenol A1001 Apr 20251
Boron2001 Sep 20251
Bromate2001 Sep 20251
Cadmium2001 Sep 20251
Chlorfenvinphos2001 Sep 20251
Chloride2001 Sep 20251
Chromium2001 Sep 20251
Clopyralid2001 Sep 20251
Clostridium Perfringens2001 Sep 20251
Coliform Bacteria15001 Dec 20251
Colony Count @ 22°C13001 Dec 20251
Colour15001 Dec 20251
Conductivity15001 Dec 20251
Copper2001 Sep 20251
Cyanide2001 Sep 20251
Cypermethrin2001 Sep 20251
Dichlobenil2001 Sep 20251
Dichlorprop2001 Sep 20251
Diflufenican2001 Sep 20251
Diuron2001 Sep 20251
E. coli15001 Dec 20251
Enterococci15001 Dec 20251
Fluoride2001 Sep 20251
Free Chlorine15001 Dec 20251
Glyphosate2001 Sep 20251
Haloacetic acids (Sum of 5 HAAs)1001 Apr 20251
Iron15001 Dec 20251
Isoproturon2001 Sep 20251
Lead2101 Sep 20251
Linuron2001 Sep 20251
Manganese2001 Sep 20251
MCPA2001 Sep 20251
Mecoprop2001 Sep 20251
Mercury2001 Sep 20251
Metaldehyde2001 Sep 20251
Nickel2001 Sep 20251
Nitrate2001 Sep 20251
Nitrite (at tap)2001 Sep 20251
Odour15001 Dec 20251
PAH2001 Sep 20251
Pendimethalin2001 Sep 20251
Pesticides - Total2001 Sep 20251
pH15001 Dec 20251
Propyzamide2001 Sep 20251
Selenium2001 Sep 20251
Simazine2001 Sep 20251
Sodium2001 Sep 20251
Sulphate2001 Sep 20251
Sum of PFAS (sum of 20)1001 Apr 20251
Taste15001 Dec 20251
Tetrachloroethene & Trichloroethene2001 Sep 20251
Total Chlorine15001 Dec 20251
Total Organic Carbon2001 Sep 20251
Triclopyr2001 Sep 20251
Trihalomethanes(Total)2001 Sep 20251
Turbidity (at tap)15001 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
01 Sep 2025Lead89ug/l10Roscommon Central Water Supply Scheme
2600PUB1002		25444819

Common questions

Frequently asked questions

Is Roscommon 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 Roscommon?

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 Roscommon?

In 2025, monitoring data for the Water Supply Zone mapped to Roscommon included 313 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 Roscommon?

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 Roscommon

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

AthloneWestmeath · approximately 27.7 kmLongfordLongford · approximately 28.3 kmBallinasloeGalway · approximately 33.2 kmTuamGalway · approximately 45.7 kmLoughreaGalway · approximately 54.1 kmMullingarWestmeath · approximately 56.9 km

How this page is made

Sources and methodology

Settlement
Census 2022 Built Up Area: Roscommon. 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
Mount Talbot/Four Roads2600PUB1001SECONDARY0.335650%