Ireland Water Level Dataset

15,621

Observations

450

Series

450

Subjects

2025–2026

Period covered

Methodology

Ingested 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

Read before relying on these figures

This is not a historical archive. The Office of Public Works serves roughly five weeks per station through this interface; its longer record sits on a separate Kisters application whose machine interface Hydrionis has not located and does not scrape. The record here deepens with each ingestion rather than reaching backwards, and the earliest date held is close to the date Hydrionis first read the service.
A level is not a depth of water. It states where the surface sits relative to Ordnance Datum, which is a national levelling reference, not the river bed.
The publisher does not say which river a station sits on through this interface, so no Irish station is linked to a water body. They appear in the monitoring network and not on any river profile.
Discharge is not available here. The site refers to flow records on its historical service, which is the same access limit as the depth.

Coverage

Subjects	Irish hydrometric stations reporting against Ordnance Datum — 450 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 Height of the water surface at a gauging station, measured against that station’s own zero point.	m	river-gauge

Rights and access

Licence position

Open with attribution. Derivative use true; redistribution true; commercial reuse true.

Attribution required:

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).

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

Office of Public Works — Irish national hydrometric network (CC BY 4.0)

Suggested citation

Hydrionis (2026), Ireland Water Level Dataset, version 1.0.0. Retrieved from https://hydrionis.com/data/datasets/ireland-water-levels/

Cite the version. Hydrionis datasets change as publishers release and as methods are revised, and a citation without a version cannot be checked later.

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.

Getting the data

river-flow observations from OPW waterlevel.ie (15,865 rows) (CSV)

Machine-readable metadata for this dataset is at /api/v1/datasets/ireland-water-levels.json. For bulk extracts, higher-volume access or commercial licensing, see data enquiries.