Chloride in Drinking Water in Ireland
Explore EPA Ireland monitoring records, listed exceedances and historical trends for Chloride in public drinking-water supplies across Ireland.
Chloride is a dissolved ion, not chlorine disinfectant.
- 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, 1,181 Chloride monitoring results were recorded from 1,181 samples across 692 public water supplies.
- The separate EPA exceedance dataset lists 1 records across 1 schemes in 2025.
- There were 122 more monitoring results than in 2024 (11.5% more). This describes the volume of monitoring, not a change in water quality.
Chloride records and the Irish indicator value
Recorded results for 2025, with official requirements shown separately.
Irish drinking-water requirement
250 mg/l
Indicator value; water should not be corrosive.
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
- 1,179
- EPA-listed exceedances
- 1
- Water supplies monitored
- 692
- 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.
The chloride indicator value concerns a different parameter from free and total chlorine. Records from these three tests are not interchangeable.
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.
5,283 numeric records; 14 censored text records; 0 other text-only records; 0 records without a result value.
4,214 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 | 1,011 | 824 | 10 | 0 | 0 |
| 2022 | 1,006 | 813 | 1 | 0 | 0 |
| 2023 | 1,028 | 814 | 1 | 0 | 0 |
| 2024 | 1,059 | 826 | 0 | 0 | 0 |
| 2025 | 1,179 | 937 | 2 | 0 | 0 |
Monitoring history 2021–2025
Monitoring volume and listed exceedances have separate scales. Select a year to inspect its figures.
Across this period, 5,297 results from 5,297 samples cover 736 distinct water supplies. Sample dates run from 05 Jan 2021 to 16 Dec 2025.
20251,181 results · 1 listed exceedances · 692 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 122 more monitoring results than in 2024 (11.5% 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 | 1,021 | 1,021 | 622 | 1 | 1 |
| 2022 | 1,007 | 1,007 | 607 | 1 | 1 |
| 2023 | 1,029 | 1,029 | 629 | 1 | 1 |
| 2024 | 1,059 | 1,059 | 650 | 1 | 1 |
| 2025 | 1,181 | 1,181 | 692 | 1 | 1 |
EPA-listed Chloride exceedances
5 listed records across 3 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 | 1 | 1 | 798 | 798 | mg/l | 250 |
| 2022 | 1 | 1 | 271 | 271 | mg/l | 250 |
| 2023 | 1 | 1 | 260.9 | 260.9 | mg/l | 250 |
| 2024 | 1 | 1 | 313.3 | 313.3 | mg/l | 250 |
| 2025 | 1 | 1 | 262.5 | 262.5 | mg/l | 250 |
Show all 5 listed records 2021–2025 · newest first
| Date | Result | Reported unit | Reported limit | Water supply scheme | Scheme code |
|---|---|---|---|---|---|
| 01 Aug 2025 | 262.5 | mg/l | 250 | Cloneycavan | 2300PUB1050 |
| 08 Apr 2024 | 313.3 | mg/l | 250 | LARAGH ANNAMOE PUBLIC SUPPLY | 3400PUB1025 |
| 03 Aug 2023 | 260.9 | mg/l | 250 | Cloneycavan | 2300PUB1050 |
| 09 Aug 2022 | 271 | mg/l | 250 | Cloneycavan | 2300PUB1050 |
| 14 Jun 2021 | 798 | mg/l | 250 | Carrigmore PWS | 1900PUB1052 |
Places with mapped Chloride monitoring data
Explore existing place reports with mapped Water Supply Zones containing Chloride 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 Chloride 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.
Chloride is distinct from chlorine
The chloride indicator value concerns a different parameter from free and total chlorine. Records from these three tests are not interchangeable.
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 Chloride report cover?
5,297 monitoring records across 5 available monitoring year(s): 2021, 2022, 2023, 2024, 2025. The selected source is Chloride. National totals come directly from EPA records, not a sum of towns.
What is the Irish drinking-water requirement for Chloride?
250 mg/l. Indicator value; water should not be corrosive.
Does chloride measure the disinfectant in my water?
No. Chloride records are separate from the Free Chlorine and Total Chlorine tests shown on the chlorine page.
Can I compare the recorded Chloride 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 Chloride 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.