Water Quality
Navan, Meath
Latest available monitoring data: 2025
Environmental Protection Agency (EPA), Ireland / Uisce Éireann / Census 2022 Built Up Areas

Your local water data

Navan Water Quality

A plain-language view of the latest available monitoring records for the Water Supply Zones mapped to Navan.

Population (Census 2022)
33,886
Primary mapped zone
Navan-Mid Meath Liscarton PWS
Primary zone geographic overlap
78.12%
CORE zones included
2

In 2025, monitoring data for Navan included 1,062 results across 68 parameters.

The figures combine records from 2 CORE Water Supply Zones mapped to the Built Up Area. They describe zone-wide monitoring, including sampling locations outside the settlement.

Latest reporting year

2025 summary

1,062Test results
68Parameters tested
6Listed exceedances
5Parameters with exceedances

54 distinct zone/sample/date combinations. Monitoring dates: 03 Jan 2025 — 04 Dec 2025.

The separate EPA exceedance dataset lists 6 records for these zones in this reporting year. Result and exceedance totals are aggregated independently.

The short version

What should I know about Navan water quality?

The figures describe the available historical records.

In 2025, monitoring data for Navan included 1,062 results across 68 parameters.
5 parameters have listed exceedance records: Trihalomethanes(Total), Coliform Bacteria, Colony Count @ 22°C, Colour, MCPA.
Navan-Mid Meath Liscarton PWS is the zone with the largest mapped geographic overlap (78.12%). Overlap measures Built Up Area land area, not population or household supply.

Monitoring over time

5-year trends 2021–2025

Available years in the latest 5-calendar-year window. Monitoring volume and descriptive frequency use separate scales.

20251,062 results · 6 listed exceedances
Total results — independent scale
0 577.5 1,155 1,042 2021 1,155 2022 1,068 2023 1,106 2024 1,062 2025
Listed exceedances per 1,000 results — independent scale
0.000 2.825 5.650 3.839 2021 3.463 2022 5.618 2023 2.712 2024 5.650 2025

This is our descriptive frequency: listed exceedance records divided by result records, multiplied by 1,000. It is not an official EPA compliance rate. Differences in sampling volume and parameters tested affect comparisons. A missing denominator is shown as unavailable.

Monitoring history by year
YearResultsSamplesParametersListed exceedancesPer 1,000 results
20211,042586443.839
20221,155636443.463
20231,068556565.618
20241,106556532.712
20251,062546865.650

Year-to-year detail

2025 compared with 2024

Changes describe dataset volumes only. The comparison uses the previous available year.

Results
20241,106
20251,062
-44
Listed exceedances
20243
20256
+3
Samples
202455
202554
-1
Parameters
202465
202568
+3

Reported records

Parameters with listed exceedances

Values and limits are reproduced as reported. Different unit/limit pairs are shown separately.

Trihalomethanes(Total)

2 listed exceedance records / 6 tests33.33%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
115.7 ug/l
Reported limit
100 ug/l
Records with this unit/limit pair
2
Latest exceedance
02 Oct 2025

Coliform Bacteria

1 listed exceedance records / 54 tests1.85%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
2 100ml
Reported limit
0 100ml
Records with this unit/limit pair
1
Latest exceedance
22 May 2025

Colony Count @ 22°C

1 listed exceedance records / 48 tests2.08%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
164 1ml
Reported limit
100 1ml
Records with this unit/limit pair
1
Latest exceedance
22 May 2025

Colour

1 listed exceedance records / 54 tests1.85%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
30 Hazen
Reported limit
20 Hazen
Records with this unit/limit pair
1
Latest exceedance
17 Jul 2025

MCPA

1 listed exceedance records / 6 tests16.67%

Descriptive frequency of records, not an official compliance measure.

Highest listed result
0.124 µg/l
Reported limit
0.1 µg/l
Records with this unit/limit pair
1
Latest exceedance
06 May 2025

Across the year

When were listed exceedances recorded?

Each point represents one listed exceedance record. Records on the same date remain separate.

Trihalomethanes(Total)02 Oct 2025
103.5 ug/lReported result
100 ug/lReported limit
Navan-Mid Meath Kilcarn PWSWater supply
JanFebMarAprMayJunJulAugSepOctNovDecColiform BacteriaColony Count @ 22°CColourMCPATrihalomethanes(Total)02 Oct 2025 — Trihalomethanes(Total): 103.5 ug/l; reported limit 100; Navan-Mid Meath Kilcarn PWS; sample 0492/2510355/0217 Jul 2025 — Colour: 30 Hazen; reported limit 20; Navan Mid-Meath Liscarton PWS; sample 0492/2507261/0306 Jun 2025 — Trihalomethanes(Total): 115.7 ug/l; reported limit 100; Navan-Mid Meath Kilcarn PWS; sample 0492/2506226/0122 May 2025 — Coliform Bacteria: 2 100ml; reported limit 0; Navan-Mid Meath Kilcarn PWS; sample 0492/2505214/0322 May 2025 — Colony Count @ 22°C: 164 1ml; reported limit 100; Navan-Mid Meath Kilcarn PWS; sample 0492/2505214/0306 May 2025 — MCPA: 0.124 µg/l; reported limit 0.1; Navan Mid-Meath Liscarton PWS; sample 0492/2505203/01

6 listed exceedance records across 5 parameters in 2025.

A closer look

Explore key parameters

Selected parameters with measurements in the displayed history window. Text-only and censored values remain unchanged.

Lead

Latest result<1 ug/l
Latest sample03 Nov 2025
2025 median1 ug/l
2025 maximum2 ug/l
Reported limit10 ug/l
Tests in 20256

0 listed exceedance records in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultListed exceedanceReported limit

10 numeric measurements available; 23 text-only records retained in JSON.

E. coli

Latest result0 across 2 records
Latest sample04 Dec 2025
2025 median0
2025 maximum0
Tests in 202554

0 listed exceedance records in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultListed exceedance

285 numeric measurements available; 0 text-only records retained in JSON.

Nitrate

Latest result10
Latest sample03 Nov 2025
2025 median8.52
2025 maximum11.54
Tests in 20256

0 listed exceedance records in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultListed exceedance

33 numeric measurements available; 0 text-only records retained in JSON.

Arsenic

Latest result<2
Latest sample03 Nov 2025
2025 median—
2025 maximum—
Tests in 20256

0 listed exceedance records in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultListed exceedance

0 numeric measurements available; 33 text-only records retained in JSON.

Fluoride

Latest result0.5
Latest sample03 Nov 2025
2025 median0.6
2025 maximum0.8
Tests in 20256

0 listed exceedance records in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultListed exceedance

33 numeric measurements available; 0 text-only records retained in JSON.

Coliform Bacteria

Latest result0 100ml across 2 records
Latest sample04 Dec 2025
2025 median0 100ml
2025 maximum2 100ml
Reported limit0 100ml
Tests in 202554

1 listed exceedance records in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultListed exceedanceReported limit

285 numeric measurements available; 0 text-only records retained in JSON.

Iron

Latest result22–22 ug/l (numeric); <14; 22 across 2 records
Latest sample04 Dec 2025
2025 median19 ug/l
2025 maximum22 ug/l
Reported limit200 ug/l
Tests in 202554

0 listed exceedance records in 2025.

View parameter history

Individual numeric measurements from 2021–2025. Text-only and censored results are retained in the history JSON and are not plotted as numbers.

Open this chart to load the measurements.

Numeric resultListed exceedanceReported limit

32 numeric measurements available; 253 text-only records retained in JSON.

Your mapped supply

Water supply

Every CORE zone is included. Geographic overlaps are reported separately and are not added together or weighted by population.

Navan-Mid Meath Liscarton PWS

78.12% geographic overlap with the Navan Built Up Area.

Technical mapping details
EDEN code
2300PUB1016
Local authority
Meath
Mapping
CORE
Spatial rank
1
Historical EPA scheme
Available
Latest monitoring year
2025
Navan-Mid Meath Kilcarn PWS

19.73% geographic overlap with the Navan Built Up Area.

Technical mapping details
EDEN code
2300PUB1051
Local authority
Meath
Mapping
CORE
Spatial rank
2
Historical EPA scheme
Available
Latest monitoring year
2025

Common questions

About this water quality data

What do the figures for Navan describe?

In 2025, monitoring data for Navan included 1,062 results across 68 parameters. The figures combine records from 2 CORE Water Supply Zones mapped to the Built Up Area. They describe zone-wide monitoring, including sampling locations outside the settlement.

Which Water Supply Zones are included?

Navan-Mid Meath Liscarton PWS; Navan-Mid Meath Kilcarn PWS. Navan-Mid Meath Liscarton PWS is the zone with the largest mapped geographic overlap (78.12%). Overlap measures Built Up Area land area, not population or household supply.

What is a listed exceedance?

A record published in the separate Environmental Protection Agency (EPA), Ireland exceedance dataset. This page preserves those records and their reported values; it does not infer new exceedances from monitoring results.

Does geographic overlap tell me which water reaches my home?

No. The mapping compares settlement and supply-zone boundaries. It does not identify individual connections or the population served by each zone.

Do these records describe current conditions?

These are historical monitoring records, not a live supply notice or a current safety assessment. Consult Uisce Éireann for current supply information.

Why are some units or reported limits missing?

The monitoring results table does not supply units. Units and limits shown here come from the separate exceedance dataset when one consistent pair is available for the parameter and reporting period. Missing values do not mean there is no regulatory limit.

How are samples counted?

A sample is identified by its Water Supply Zone code, sample ID and sample date. A sample ID reused by another zone is counted separately. Results and exceedances are aggregated independently.

For closer inspection

Detailed data

The complete parameter and listed exceedance tables for the reporting year.

68 parameter rows6 listed exceedance records54 samples
Show detailed data68 parameters · 6 exceedance records

Complete parameter index

All parameters in 2025

All parameters with test results or listed exceedance records in the latest reporting year
1,2-dichloroethane6003 Nov 20252
2,3,6-trichlorobenzoic acid6003 Nov 20252
2,4-D6003 Nov 20252
Acrylamide6003 Nov 20252
Aluminium54004 Dec 20252
Ammonium6003 Nov 20252
Antimony6003 Nov 20252
Arsenic6003 Nov 20252
Atrazine6003 Nov 20252
Bentazone6003 Nov 20252
Benzene6003 Nov 20252
Benzo(a)pyrene6003 Nov 20252
Bisphenol A6003 Nov 20252
Boron6003 Nov 20252
Bromate6003 Nov 20252
Cadmium6003 Nov 20252
Chlorfenvinphos6003 Nov 20252
Chloride6003 Nov 20252
Chromium6003 Nov 20252
Clopyralid6003 Nov 20252
Clostridium Perfringens6003 Nov 20252
Coliform Bacteria54104 Dec 20252
Colony Count @ 22°C48104 Dec 20252
Colour54104 Dec 20252
Conductivity54004 Dec 20252
Copper6003 Nov 20252
Cyanide6003 Nov 20252
Cypermethrin6003 Nov 20252
Dichlobenil6003 Nov 20252
Dichlorprop6003 Nov 20252
Diflufenican6003 Nov 20252
Diuron6003 Nov 20252
E. coli54004 Dec 20252
Enterococci54004 Dec 20252
Fluoride6003 Nov 20252
Free Chlorine54004 Dec 20252
Glyphosate6003 Nov 20252
Haloacetic acids (Sum of 5 HAAs)6003 Nov 20252
Iron54004 Dec 20252
Isoproturon6003 Nov 20252
Lead6003 Nov 20252
Linuron6003 Nov 20252
Manganese6003 Nov 20252
MCPA6103 Nov 20252
Mecoprop6003 Nov 20252
Mercury6003 Nov 20252
Metaldehyde6003 Nov 20252
Nickel6003 Nov 20252
Nitrate6003 Nov 20252
Nitrite (at tap)6003 Nov 20252
Odour48004 Dec 20252
PAH6003 Nov 20252
Pendimethalin6003 Nov 20252
Pesticides - Total6003 Nov 20252
pH54004 Dec 20252
Propyzamide6003 Nov 20252
Selenium6003 Nov 20252
Simazine6003 Nov 20252
Sodium6003 Nov 20252
Sulphate6003 Nov 20252
Sum of PFAS (sum of 20)6003 Nov 20252
Taste48004 Dec 20252
Tetrachloroethene & Trichloroethene6003 Nov 20252
Total Chlorine54004 Dec 20252
Total Organic Carbon6003 Nov 20252
Triclopyr6003 Nov 20252
Trihalomethanes(Total)6203 Nov 20252
Turbidity (at tap)54004 Dec 20252

Showing 68 of 68 parameters.

EPA exceedance dataset

Listed exceedances in 2025

Newest first. Sample IDs distinguish records that may otherwise look identical.

All listed exceedance records in the latest reporting year
DateParameterResultUnitReported limitWater supply / EDENSample ID
02 Oct 2025Trihalomethanes(Total)103.5ug/l100Navan-Mid Meath Kilcarn PWS
2300PUB1051		0492/2510355/02
17 Jul 2025Colour30Hazen20Navan Mid-Meath Liscarton PWS
2300PUB1016		0492/2507261/03
06 Jun 2025Trihalomethanes(Total)115.7ug/l100Navan-Mid Meath Kilcarn PWS
2300PUB1051		0492/2506226/01
22 May 2025Coliform Bacteria2100ml0Navan-Mid Meath Kilcarn PWS
2300PUB1051		0492/2505214/03
22 May 2025Colony Count @ 22°C1641ml100Navan-Mid Meath Kilcarn PWS
2300PUB1051		0492/2505214/03
06 May 2025MCPA0.124µg/l0.1Navan Mid-Meath Liscarton PWS
2300PUB1016		0492/2505203/01

Nearby places

Nearby place links are not available yet.

Methodology

Sources and definitions

Settlement
Census 2022 Built Up Areas. Population refers to the whole settlement.
Water Supply Zones
Uisce Éireann spatial boundary mapping, spatial_intersection_esri_2026.
Monitoring
Environmental Protection Agency (EPA), Ireland public water supply monitoring and separate exceedance datasets, 2021–2025.

CORE means a positive intersection covering at least 1% of the Built Up Area. SECONDARY covers 0.1% to below 1%; BOUNDARY_TOUCH covers positive areas below 0.1%. All mappings are retained; only CORE zones contribute to headline monitoring figures.

Geographic overlap is a share of land area, not population. Each zone's records are included once per settlement using its EDEN/EPA scheme code. Records may appear on more than one settlement page where the same zone serves a wider area; settlement totals must not be added to estimate a national total.

Listed exceedances come from a separate dataset. Descriptive frequency divides listed exceedance record counts by monitoring result record counts. It is not an official EPA compliance rate and does not establish that each listed record has a matching result in the monitoring dataset.

Medians and maxima use non-null numeric results. Censored text such as “< 0.1” is preserved and is not converted into a number. Multiple results on the latest date are described together; a representative record does not imply time order within that day. Reported limits are source values, not a regulatory reference directory.

The latest reporting year is determined from monitoring results for the mapped CORE zones. If there are no monitoring results, available exceedance years are used. Missing years are not invented as zero-result years.