Ireland Water Level Dataset
Daily mean water level against Ordnance Datum for the Irish national hydrometric network: 450 stations coordinated by the Office of Public Works, accumulated from a publisher that serves a five-week window.
What this looks like
One real series from the dataset, and real rows from the head of its published extract. Neither is a mock-up: the rows below are the same rows, unchanged, that are in the file you would download.
Drawn to show the shape and resolution of what the dataset contains, not to make a point about Carlingford. Gaps are breaks, never interpolated.
View the data behind this chart
| Period | Carlingford (m) |
|---|---|
| 2026 | -0.749 |
Sample rows
metric_id | subject_id | subject_kind | value | censored | censor_operator | censor_threshold | censor_limit | censor_reported | unit | period_start | period_end | period_kind | basis | confidence | source_id | source_ref | qualifier | superseded | retrieved |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| river-level | ie-opw-0000001041 | geography | 3.853135 | — | — | — | — | — | m | 2026-07-22 | 2026-07-22 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.848365 | — | — | — | — | — | m | 2026-07-23 | 2026-07-23 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.846021 | — | — | — | — | — | m | 2026-07-24 | 2026-07-24 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.842188 | — | — | — | — | — | m | 2026-07-25 | 2026-07-25 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.843448 | — | — | — | — | — | m | 2026-07-26 | 2026-07-26 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.852573 | — | — | — | — | — | m | 2026-07-27 | 2026-07-27 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.91026 | — | — | — | — | — | m | 2026-07-28 | 2026-07-28 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 4.029583 | — | — | — | — | — | m | 2026-07-29 | 2026-07-29 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.976271 | — | — | — | — | — | m | 2026-07-30 | 2026-07-30 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.914385 | — | — | — | — | — | m | 2026-07-31 | 2026-07-31 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.889396 | — | — | — | — | — | m | 2026-08-01 | 2026-08-01 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
| river-level | ie-opw-0000001041 | geography | 3.871042 | — | — | — | — | — | m | 2026-08-02 | 2026-08-02 | day | aggregated | medium | ie-opw-waterlevel | 0000001041 | — | — | 2026-10-01 |
Methodology
Collected from the waterlevel.ie GeoJSON index and per-sensor CSV under CC BY 4.0. Fifteen-minute readings are reduced to daily means, and a day with fewer than 72 of its expected 96 readings is refused rather than averaged from a partial day. Each sensor’s parameter is confirmed against the publisher’s own station page before any value is read: the interface identifies a series only by a code, and the codes are not self-explanatory — one returns values that read perfectly as a water temperature and are the station’s battery voltage. Levels are taken against Ordnance Datum rather than the staff-gauge reading the same stations also publish, because Ordnance Datum is national and staff-gauge zeros are local.
What this dataset cannot tell you
Coverage
| Subjects | Irish hydrometric stations reporting against Ordnance Datum — 451 held |
|---|---|
| Period | 2025–2026 |
| Units | m |
| Update cadence | Daily |
| Identifier | ireland-water-levels v1.0.0 |
Fields
Data dictionary →Every metric this dataset carries, with the unit it is stored in and the geography level it is reported at. Full definitions are in the data dictionary.
| Identifier | Field | Unit | Reported at |
|---|---|---|---|
river-level | River level | m | river-gauge |
Rights and access
Licence position
Open with attribution. Derivative use true; redistribution true; commercial reuse true.
Permitted uses
- Public display
- Derived analysis
- API delivery
- Bulk download
- Commercial use
Available to: Public, Developer, Research, Professional, Enterprise. These follow from the rights of the contributing publishers, not from a Hydrionis pricing decision — no access tier can widen what a publisher withheld.
Contributing sources
Attribution and citation
Cite and reuse →Two different obligations, deliberately kept apart. One is a condition of somebody else's licence; the other is a request Hydrionis has no standing to enforce.
Attribution you are required to give
These are conditions of the licences the underlying data is published under. They are obligations to the publishers, not to Hydrionis, and they apply to you directly whether or not you mention Hydrionis at all.
Contains Irish Public Sector Information licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence (source http://waterlevel.ie — provided by the Office of Public Works).
- Office of Public Works — CC BY 4.0 (licence text)
Suggested citation for Hydrionis
Hydrionis (2026), Ireland Water Level Dataset, version 1.0.0, accessed 2026-10-05, hydrionis.com/data/datasets/ireland-water-levels/
Cite Hydrionis where you rely on the compilation, the normalisation, the eligibility judgements or a chart. Where you use an unmodified published value, the publisher’s attribution is the one that is required; crediting Hydrionis as well is welcome and is not something Hydrionis can require of you.
Changelog
Version 1.0.0 — 2026-08-26
First release. Ireland becomes a monitored jurisdiction.
Additions
- Daily mean water level for 450 stations against Ordnance Datum.
Use this data
Use this data
About this data
The fields a professional user needs to judge whether this is fit for a particular purpose. Deliberately not a score.
About this data
| Source | Office of Public Works — Irish national hydrometric network · CC BY 4.0 |
|---|---|
| How the values came to exist | Mixed across the series — the basis is recorded on every individual value. |
| Period held | 2025–2026 |
| Known gaps |
|
| Continuity | Version 1.0.0, released 2026-08-26. 1 recorded version; breaking changes and corrections are listed in the changelog above. |
| Last read from the publisher | 2026-10-01 · publisher updates daily |
| Redistribution | Permitted by the upstream licences |
| Commercial reuse | Permitted by the upstream licences. No Hydrionis access tier can widen this. |
| Methodology | How this was produced |