Manganese in Drinking Water in Ireland
Explore EPA Ireland monitoring records, listed exceedances and historical trends for Manganese in public drinking-water supplies across Ireland.
Manganese occurs naturally in some water sources.
- Latest monitoring year
- 2025
- Page updated
- September 2026
- Data available
- 2021, 2022, 2023, 2024, 2025
These are historical public-supply monitoring records, not a current water notice or a test of every household. Sampling locations can be outside the linked towns.
What do the latest results show?
The latest year is 2025. Results and listed exceedances are counted separately from their respective datasets.
- In 2025, 1,293 Manganese monitoring results were recorded from 1,293 samples across 703 public water supplies.
- The separate EPA exceedance dataset lists 14 records across 11 schemes in 2025.
- There were 79 more monitoring results than in 2024 (6.5% more). This describes the volume of monitoring, not a change in water quality.
Manganese monitoring and the indicator standard
Recorded results for 2025, with official requirements shown separately.
Irish drinking-water requirement
50 µg/l
Indicator value; not a national safety score.
This is separate guidance, not a test result for your own water. It does not reclassify historical records.
Official guidance checked 14 Sep 2026.
Monitoring coverage · 2025
- Numeric measurements
- 601
- EPA-listed exceedances
- 14
- Water supplies monitored
- 703
- First sample
- 27 Jan 2025
- Latest sample
- 16 Dec 2025
These are historical records, not the current status of your water. EPA-listed exceedances come from a separate dataset.
Manganese is an indicator parameter in the Irish regulations. Its records are kept separate from iron, even where both occur in a supply.
Monitoring measurement units are not verified, so these recorded values cannot be compared with the official standard. Units in the listed exceedance table are reproduced separately from that source.
How to read these results
Measurement coverage · 2021–2025
The imported monitoring records have no unit field. These are counts of recorded values, not concentrations or a comparison with the standard.
2,587 numeric records; 3,215 censored text records; 0 other text-only records; 22 records without a result value.
4,992 records have a non-empty text field, including records that also have a numeric value. This overlapping field count must not be added to the numeric total.
| Year | Numeric | Non-empty text field | Censored text | Other text only | No result value |
|---|---|---|---|---|---|
| 2021 | 546 | 963 | 559 | 0 | 2 |
| 2022 | 489 | 945 | 590 | 0 | 0 |
| 2023 | 469 | 978 | 658 | 0 | 4 |
| 2024 | 482 | 1,050 | 724 | 0 | 8 |
| 2025 | 601 | 1,056 | 684 | 0 | 8 |
Monitoring history 2021–2025
Monitoring volume and listed exceedances have separate scales. Select a year to inspect its figures.
Across this period, 5,824 results from 5,824 samples cover 740 distinct water supplies. Sample dates run from 05 Jan 2021 to 16 Dec 2025.
20251,293 results · 14 listed exceedances · 703 schemes monitored
Monitoring results — independent scale
EPA-listed exceedance records — independent scale
These are record counts, not an official EPA compliance rate. The number and selection of samples and monitored schemes can change between years.
There were 79 more monitoring results than in 2024 (6.5% more). This describes the volume of monitoring, not a change in water quality.
| Year | Results | Samples | Schemes monitored | Listed exceedances | Schemes with listed exceedances |
|---|---|---|---|---|---|
| 2021 | 1,107 | 1,107 | 636 | 17 | 14 |
| 2022 | 1,079 | 1,079 | 619 | 17 | 14 |
| 2023 | 1,131 | 1,131 | 643 | 17 | 15 |
| 2024 | 1,214 | 1,214 | 660 | 9 | 6 |
| 2025 | 1,293 | 1,293 | 703 | 14 | 11 |
EPA-listed Manganese exceedances
74 listed records across 47 distinct schemes, 2021–2025. These are historical sample records, not a current assessment of each property in a supply zone.
Results and limits below are reproduced from the separate EPA exceedance dataset, with its own reported units. These units are not assigned to the wider monitoring dataset.
| Year | Records | Schemes | Lowest listed result | Highest listed result | Reported unit | Reported limit |
|---|---|---|---|---|---|---|
| 2021 | 17 | 14 | 55 | 464 | ug/l | 50 |
| 2022 | 17 | 14 | 51 | 246 | ug/l | 50 |
| 2023 | 17 | 15 | 52 | 909 | ug/l | 50 |
| 2024 | 9 | 6 | 54 | 254 | ug/l | 50 |
| 2025 | 14 | 11 | 51 | 214 | ug/l | 50 |
Show all 74 listed records 2021–2025 · newest first
| Date | Result | Reported unit | Reported limit | Water supply scheme | Scheme code |
|---|---|---|---|---|---|
| 03 Dec 2025 | 214 | ug/l | 50 | Knockeragh | 0500PUB1605 |
| 27 Nov 2025 | 166 | ug/l | 50 | Toormore | 0500PUB4504 |
| 18 Nov 2025 | 82 | ug/l | 50 | Cork City Water Supply | 0400PUB1001 |
| 04 Nov 2025 | 51 | ug/l | 50 | Cork City Water Supply | 0400PUB1001 |
| 21 Oct 2025 | 127 | ug/l | 50 | Cork City Water Supply | 0400PUB1001 |
| 15 Sep 2025 | 91 | ug/l | 50 | Reenmeen West (Glengariff) | 0500PUB4608 |
| 01 Sep 2025 | 52 | ug/l | 50 | Newtown Newcastle Kilcoole PWS | 3400PUB1010 |
| 15 Jul 2025 | 58 | ug/l | 50 | Listowel Regional Public Water Supply | 1300PUB1204 |
| 16 Jun 2025 | 95 | ug/l | 50 | Stagmount | 0500PUB1606 |
| 10 Jun 2025 | 58 | ug/l | 50 | Cork City Water Supply | 0400PUB1001 |
| 20 May 2025 | 115 | ug/l | 50 | INISHOWEN EAST | 0600PUB1022 |
| 09 May 2025 | 61 | ug/l | 50 | West Clare Rws (New Wtp) | 0300PUB1066 |
| 06 May 2025 | 53 | ug/l | 50 | Cork Harbour & City | 0500PUB3401 |
| 04 Mar 2025 | 54 | ug/l | 50 | Hollyfort | 3300PUB1801 |
| 07 Oct 2024 | 254 | ug/l | 50 | Leixlip Regional | 1400PUB1019 |
| 25 Sep 2024 | 54 | ug/l | 50 | West Clare Rws (New Wtp) | 0300PUB1066 |
| 12 Aug 2024 | 149 | ug/l | 50 | Shannon/Sixmilebridge RWSS | 0300PUB1040 |
| 02 Aug 2024 | 62 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 19 Jun 2024 | 74 | ug/l | 50 | Shannon/Sixmilebridge RWSS | 0300PUB1040 |
| 14 Jun 2024 | 119 | ug/l | 50 | Shannon/Sixmilebridge RWSS | 0300PUB1040 |
| 01 May 2024 | 58 | ug/l | 50 | Poulaphouca Regional | 1400PUB1023 |
| 15 Apr 2024 | 76 | ug/l | 50 | Lios Cearnaigh PWS 052D | 1300PUB1028 |
| 29 Mar 2024 | 60 | ug/l | 50 | Shannon/Sixmilebridge RWSS | 0300PUB1040 |
| 06 Nov 2023 | 92 | ug/l | 50 | Stagmount | 0500PUB1606 |
| 01 Nov 2023 | 909 | ug/l | 50 | Slyguff | 0100PUB1178 |
| 09 Oct 2023 | 52 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 09 Oct 2023 | 73 | ug/l | 50 | Lough Mask Westport Town Mixed Supply | 2200PUB1039 |
| 04 Oct 2023 | 60 | ug/l | 50 | Ennistymon RWS | 0300PUB1004 |
| 02 Oct 2023 | 62.9 | ug/l | 50 | Cork Harbour & City | 0500PUB3401 |
| 25 Sep 2023 | 69 | ug/l | 50 | Mountain Stage PWS 062A | 1300PUB1119 |
| 12 Sep 2023 | 63 | ug/l | 50 | Poulavanogue | 3100PUB1082 |
| 11 Sep 2023 | 194 | ug/l | 50 | North Sligo Regional Water Supply | 2700PUB2705 |
| 05 Sep 2023 | 85 | ug/l | 50 | Carna/Kilkieran RWSS | 1200PUB1008 |
| 04 Aug 2023 | 75 | ug/l | 50 | LONGFORD CENTRAL | 2000PUB1010 |
| 04 Aug 2023 | 58 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 01 Aug 2023 | 150 | ug/l | 50 | Barrow Supply | 1400PUB1060 |
| 13 Jul 2023 | 175 | ug/l | 50 | East Waterford Water Supply Scheme | 3800PUB1110 |
| 14 Jun 2023 | 54 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 26 May 2023 | 56 | ug/l | 50 | Fews | 3100PUB1045 |
| 15 May 2023 | 327 | ug/l | 50 | Brosna/Knocknagoshel PWS 016F | 1300PUB1012 |
| 07 Nov 2022 | 76 | ug/l | 50 | Cork City Water Supply | 0400PUB1001 |
| 19 Oct 2022 | 241 | ug/l | 50 | BALLINAPARK PUBLIC SUPPLY | 3400PUB1055 |
| 16 Sep 2022 | 79 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 12 Sep 2022 | 246 | ug/l | 50 | North East Regional PWS | 2600PUB1030 |
| 07 Sep 2022 | 146 | ug/l | 50 | Ennistymon RWS | 0300PUB1004 |
| 22 Aug 2022 | 228 | ug/l | 50 | Inisboffin PWS | 1200PUB1024 |
| 05 Jul 2022 | 57 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 14 Jun 2022 | 69 | ug/l | 50 | Cork City Water Supply | 0400PUB1001 |
| 14 Jun 2022 | 114 | ug/l | 50 | Newport RWSS | 2800PUB1004 |
| 13 Jun 2022 | 125 | ug/l | 50 | BALLYMAHON | 2000PUB1005 |
| 09 Jun 2022 | 94 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 01 Jun 2022 | 109 | ug/l | 50 | Navan-Mid Meath Kilcarn PWS | 2300PUB1051 |
| 17 May 2022 | 59 | ug/l | 50 | Bandon Regional | 0500PUB2101 |
| 09 May 2022 | 119 | ug/l | 50 | North Roscommon Regional Water Supply Scheme | 2600PUB1012 |
| 03 May 2022 | 87 | ug/l | 50 | West Clare Rws (New Wtp) | 0300PUB1066 |
| 05 Apr 2022 | 52 | ug/l | 50 | Cavan RWSS | 0200PUB0100 |
| 09 Feb 2022 | 51 | ug/l | 50 | Louisburgh PWS | 2200PUB1020 |
| 02 Nov 2021 | 112 | ug/l | 50 | Slyguff | 0100PUB1178 |
| 06 Oct 2021 | 118 | ug/l | 50 | Shannon/Sixmilebridge RWSS | 0300PUB1040 |
| 01 Oct 2021 | 294 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 09 Sep 2021 | 92 | ug/l | 50 | East Waterford Water Supply Scheme | 3800PUB1110 |
| 07 Sep 2021 | 109 | ug/l | 50 | GOWNA | 2000PUB1011 |
| 06 Sep 2021 | 95 | ug/l | 50 | Belturbet PWS | 0200PUB0108 |
| 17 Aug 2021 | 89 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 10 Aug 2021 | 56 | ug/l | 50 | KILCASH | 2900PUB0147 |
| 06 Aug 2021 | 68.4 | ug/l | 50 | Kilconnell PWS | 1200PUB1030 |
| 22 Jul 2021 | 67.1 | ug/l | 50 | Inishturk Pgws | 2200PUB1031 |
| 06 Jul 2021 | 194 | ug/l | 50 | Barrow/Poulaphouca Blend | 1400PUB1070 |
| 17 Jun 2021 | 214 | ug/l | 50 | Joanstown | 3100PUB1103 |
| 10 Jun 2021 | 111 | ug/l | 50 | Spiddal Public Water Supply | 1200PUB1045 |
| 08 Jun 2021 | 464 | ug/l | 50 | Cavanhill | 2100PUB1018 |
| 01 Jun 2021 | 185 | ug/l | 50 | Barrow/Poulaphouca Blend | 1400PUB1070 |
| 19 Apr 2021 | 85.5 | ug/l | 50 | An MhuirÃoch/ Baile Breach PWS 063D | 1300PUB1044 |
| 12 Apr 2021 | 55 | ug/l | 50 | Barrow Supply | 1400PUB1060 |
Places with mapped Manganese monitoring data
Explore existing place reports with mapped Water Supply Zones containing Manganese monitoring records in 2021–2025.
95 published places have at least one qualifying mapped zone. The 20 largest are listed below by Census 2022 population, not by Manganese levels.
Places can share the same Water Supply Zone. These links do not represent independent city measurements; sampling locations may be outside the named Built Up Area. National totals above count each source record once.
DublinDublinCorkCorkLimerickLimerickGalwayGalwayWaterfordWaterfordDroghedaLouthDundalkLouthSwordsDublinNavanMeathBrayWicklowEnnisClareCarlowCarlowKilkennyKilkennyNaasKildareTraleeKerryNewbridgeKildareBalbrigganDublinPortlaoiseLaoisAthloneWestmeathMullingarWestmeath
View all places — the complete published place directory.
Source water and manganese
Manganese is an indicator parameter in the Irish regulations. Its records are kept separate from iron, even where both occur in a supply.
Current water information for your address
For current supply information, check your Eircode with Uisce Éireann. Follow the notice for your address: a Boil Water Notice and a Do Not Consume Notice have different instructions. This historical report does not recommend boiling as a treatment for chemical parameters.
Frequently asked questions
What does this Manganese report cover?
5,824 monitoring records across 5 available monitoring year(s): 2021, 2022, 2023, 2024, 2025. The selected source is Manganese. National totals come directly from EPA records, not a sum of towns.
What is the Irish drinking-water requirement for Manganese?
50 µg/l. Indicator value; not a national safety score.
How is manganese represented in this report?
Only records labelled Manganese are counted. A value from an individual sample does not describe every property in a Water Supply Zone.
Can I compare the recorded Manganese values with the standard?
Monitoring unit metadata have not been verified in this import. Numeric and censored records are counted separately; no concentration median, maximum or compliance rate is inferred from them. Listed records keep the units supplied by the separate EPA exceedance dataset.
Does a place link give the current Manganese result at my address?
No. It identifies a place with a mapped supply and historical monitoring. It is not a test of every property. Check current Uisce Éireann supply information using your Eircode.
Sources and methodology
- Monitoring data
- EPA Ireland: drinking-water monitoring data: public-supply monitoring results and the separate listed exceedance records, 2021–2025.
- Water testing
- Uisce Éireann: drinking water tests
- Counting
- Source records are counted once across schemes. A sample is identified by its scheme, sample ID and date. Listed exceedances are not inferred from numeric results.
- Interpretation
- Text and censored results are not converted to numbers. Missing values are not zero. Records do not establish conditions in an individual home or an official compliance rate.