Colour in Drinking Water in Ireland

These are historical records, not the current status of your water. EPA-listed exceedances come from a separate dataset.

The statutory requirement concerns consumer acceptability and abnormal changes. This page does not assign a health verdict from a colour record.

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.

Across this period, 40,591 results from 40,591 samples cover 757 distinct water supplies. Sample dates run from 04 Jan 2021 to 22 Dec 2025.

There were 428 more monitoring results than in 2024 (5.4% more). This describes the volume of monitoring, not a change in water quality.

95 published places have at least one qualifying mapped zone. The 20 largest are listed below by Census 2022 population, not by Colour 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.

View all places — the complete published place directory.