WaterCheck Ireland

Coliform Bacteria in Drinking Water in Ireland

Explore EPA Ireland monitoring records, listed exceedances and historical trends for Coliform Bacteria in public drinking-water supplies across Ireland.

Coliform bacteria are indicators used in water monitoring.

Latest monitoring year
2025
Page updated
September 2026
Data available
2021, 2022, 2023, 2024, 2025
8,330Monitoring results
8,330Samples
711Water supplies monitored
60EPA-listed exceedances

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.

  1. In 2025, 8,330 Coliform Bacteria monitoring results were recorded from 8,330 samples across 711 public water supplies.
  2. The separate EPA exceedance dataset lists 60 records across 48 schemes in 2025.
  3. There were 429 more monitoring results than in 2024 (5.4% more). This describes the volume of monitoring, not a change in water quality.

Coliform monitoring and the indicator standard

Recorded results for 2025, with official requirements shown separately.

Irish drinking-water requirement

0 number/100 ml

Indicator value for public piped drinking water.

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
8,235
EPA-listed exceedances
60
Water supplies monitored
711
First sample
02 Jan 2025
Latest sample
22 Dec 2025

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

The regulations list coliform bacteria and E. coli separately. A coliform record is not relabelled as E. coli, and the report makes no inference about which organism was present.

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.

40,311 numeric records; 9 censored text records; 66 other text-only records; 383 records without a result value.

20,050 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.

Result representation by year
YearNumericNon-empty text fieldCensored textOther text onlyNo result value
20218,2344,1302660
20228,2573,579200
20237,8834,2521093
20247,7024,25020197
20258,2353,8392093

Across this period, 40,769 results from 40,769 samples cover 757 distinct water supplies. Sample dates run from 04 Jan 2021 to 22 Dec 2025.

20258,330 results · 60 listed exceedances · 711 schemes monitored
Monitoring results — independent scale
04,1658,330 8,302 2021 8,259 2022 7,977 2023 7,901 2024 8,330 2025
8,302
2021
8,259
2022
7,977
2023
7,901
2024
8,330
2025
EPA-listed exceedance records — independent scale
035.571 43 2021 60 2022 71 2023 50 2024 60 2025
43
2021
60
2022
71
2023
50
2024
60
2025

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

Coliform Bacteria monitoring, 2021–2025
YearResultsSamplesSchemes monitoredListed exceedancesSchemes with listed exceedances
20218,3028,3027534341
20228,2598,2597346055
20237,9777,9777267158
20247,9017,9017195043
20258,3308,3307116048

EPA-listed Coliform Bacteria exceedances

284 listed records across 177 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.

Listed exceedances by year and reported unit/limit pair
YearRecordsSchemesLowest listed resultHighest listed resultReported unitReported limit
202143411201100ml0
202260551488100ml0
2023715812,420100ml0
202450431201100ml0
202560481201100ml0
Show all 284 listed records 2021–2025 · newest first
All EPA-listed Coliform Bacteria exceedances in the reporting period
DateResultReported unitReported limitWater supply schemeScheme code
12 Dec 202574100ml0Dursey Island0500PUB4207
02 Dec 202516100ml0Ceann Trá PWS 074D1300PUB1045
01 Dec 20251100ml0Mallow0500PUB1313
01 Dec 20251100ml0Kilkenny City (Troyswood) PWS1500PUB1011
24 Nov 20251100ml0South Dublin Zone 20800PUB1001
18 Nov 20258100ml0Mullingar Regional3200PUB1005
10 Nov 20252100ml0Fingal Zone 10900PUB1001
06 Nov 20254100ml0GLENARY2900PUB0134
04 Nov 202524100ml0Cork City Water Supply0400PUB1001
30 Oct 2025201100ml0South Leitrim Regional1700PUB1100
22 Oct 20255100ml0South Dublin Zone 40800PUB1004
21 Oct 20258100ml0Cork City Water Supply0400PUB1001
14 Oct 20251100ml0Fingal Zone 10900PUB1001
09 Oct 2025109100ml0Shannon/Sixmilebridge RWSS0300PUB1040
09 Oct 20252100ml0Shannon/Sixmilebridge RWSS0300PUB1040
07 Oct 202514100ml0Cork City Water Supply0400PUB1001
06 Oct 20251100ml0DLR Zone 61000PUB1006
06 Oct 20252100ml0Central Regional - Lough Guitane (H) 400F1300PUB1016
18 Sep 2025100100ml0Ballinkillen0100PUB1166
15 Sep 20251100ml0Ennis PWS0300PUB1009
15 Sep 20251100ml0Crosterra0500PUB4110
09 Sep 20252100ml0Cork City Water Supply0400PUB1001
09 Sep 20251100ml0INISHOWEN EAST0600PUB1022
02 Sep 202511100ml0DLR Zone 61000PUB1006
29 Aug 20252100ml0Mountbellew PWS1200PUB1039
26 Aug 202535100ml0DCC Zone 40700PUB1005
25 Aug 20255100ml0DCC Zone 30700PUB1004
25 Aug 20251100ml0DCC Zone 30700PUB1004
25 Aug 20259100ml0Galway City PWS1100PUB1001
21 Aug 202510100ml0Daingean PWS2500PUB1006
19 Aug 20251100ml0Glenville0500PUB3304
19 Aug 20252100ml0Cork Harbour & City0500PUB3401
08 Aug 202515100ml0Bagenalstown0100PUB1161
08 Aug 20257100ml0LANESBORO2000PUB1009
31 Jul 20256100ml0Kinvara PWS1200PUB1034
31 Jul 20251100ml0Tuam RWSS1200PUB1047
31 Jul 20251100ml0LOUGH MASK RWSS2200PUB1032
25 Jul 20254100ml0East Waterford Water Supply Scheme3800PUB1110
21 Jul 20251100ml0Galway City PWS1100PUB1001
21 Jul 20251100ml0Galway City PWS1100PUB1001
21 Jul 20252100ml0Monaghan2400PUB1024
21 Jul 2025100100ml0Nenagh RWSS2800PUB1008
18 Jul 20252100ml0Cavanhill2100PUB1018
16 Jul 20251100ml0ARRANMORE ISLAND0600PUB1061
01 Jul 20252100ml0Fingal Zone 30900PUB1003
23 Jun 20258100ml0Cullen0500PUB2206
13 Jun 202513100ml0LONGFORD CENTRAL2000PUB1010
03 Jun 202546100ml0North Leitrim Regional Water Supply1700PUB0012
27 May 20253100ml0Bilberry0500PUB2401
22 May 20252100ml0Navan-Mid Meath Kilcarn PWS2300PUB1051
07 May 202563100ml0KNOCKANANNA PUBLIC SUPPLY3400PUB1035
28 Apr 20251100ml0Ballyroan PWS1600PUB1074
24 Apr 202515100ml0Bray PWS3400PUB1001
08 Apr 20251100ml0South Dublin Zone 20800PUB1001
01 Apr 20251100ml0Boyle Regional2600PUB1027
19 Mar 20255100ml0Cork Harbour & City0500PUB3401
10 Mar 20258100ml0Cavan RWSS0200PUB0100
14 Feb 20251100ml0Kells-Oldcastle2300PUB1011
07 Feb 20255100ml0Bagenalstown0100PUB1161
09 Jan 20252100ml0Clonroche3300PUB1452
02 Dec 202418100ml0North East Regional PWS2600PUB1030
19 Nov 20243100ml0Cork City Water Supply0400PUB1001
18 Nov 20241100ml0Ballyconnell PWS0200PUB0105
04 Nov 20241100ml0Nenagh RWSS2800PUB1008
01 Nov 20241100ml0Drum2400PUB1007
17 Oct 20246100ml0Cavan RWSS0200PUB0100
15 Oct 202478100ml0Inishmore - Oghill1200PUB1026
07 Oct 2024201100ml0Ballyvadonna0500PUB1223
05 Sep 20245100ml0BLESSINGTON PUBLIC SUPPLY3400PUB1018
03 Sep 20241100ml0Cork City Water Supply0400PUB1001
02 Sep 202488100ml0The Strand PWS1600PUB0027
02 Sep 20241100ml0Roscommon Central Water Supply Scheme2600PUB1002
26 Aug 20241100ml0GRANARD2000PUB1006
23 Aug 20242100ml0West Clare Rws (New Wtp)0300PUB1066
20 Aug 20242100ml0Cork City Water Supply0400PUB1001
20 Aug 20241100ml0Fingal Zone 10900PUB1001
16 Aug 20241100ml0South Louth & East Meath2100PUB1019
16 Aug 20241100ml0BALLYKNOCKAN VALLEYMOUNT PUBLIC SUPPLY3400PUB1026
14 Aug 20245100ml0Mullingar Regional3200PUB1005
12 Aug 20243100ml0South Kilkenny Environs PWS1500PUB1020
06 Aug 2024118100ml0Killeshandra PWS0200PUB0113
23 Jul 20242100ml0South Dublin Zone 20800PUB1001
15 Jul 20242100ml0West Clare Rws (Old Wtp)0300PUB1022
02 Jul 20246100ml0Cockhill0500PUB1403
21 Jun 20244100ml0Geashill PWS2500PUB1010
20 Jun 202423100ml0Ardcarraig Clogherinkoe1400PUB1051
10 Jun 202437100ml0DCC Zone 10700PUB1001
10 Jun 20244100ml0Fingal Zone 10900PUB1001
07 Jun 20242100ml0Ennis PWS0300PUB1009
23 May 20241100ml0Foxes Den Public Water Supply2700PUB2701
15 May 20241100ml0Coolineagh0500PUB3211
14 May 20243100ml0Galway City PWS1100PUB1001
07 May 20242100ml0East Waterford Water Supply Scheme3800PUB1110
01 May 20241100ml0Leixlip Regional1400PUB1019
22 Apr 202456100ml0LERWSS2400PUB1001
15 Apr 20241100ml0Kealkill0500PUB4105
09 Apr 20241100ml0Minane Bridge0500PUB2209
09 Apr 20241100ml0Kinlough/Tullaghan1700PUB0020
08 Apr 20241100ml0Cork Harbour & City0500PUB3401
08 Apr 202430100ml0Rathangan1400PUB1041
29 Mar 202478100ml0Ennis PWS0300PUB1009
20 Feb 20244100ml0Cavanhill2100PUB1018
19 Feb 20241100ml0Fingal Zone 10900PUB1001
12 Feb 20241100ml0POLLAN DAM PUB0600PUB1020
12 Feb 20241100ml0Glin PWS1900PUB1030
06 Feb 20242100ml0Glenderry PWS 076E1300PUB1099
06 Feb 202410100ml0Ballintermon 003D1300PUB3002
23 Jan 20241100ml0South Dublin Zone 20800PUB1001
12 Jan 20241100ml0Foxes Den Public Water Supply2700PUB2701
08 Jan 2024201100ml0Limerick City Environs PWS1900PUB1032
18 Dec 20234100ml0Ballina Town Mixed Supply2200PUB1008
15 Dec 20231100ml0Enniscorthy3300PUB1491
13 Dec 20231100ml0LONGFORD CENTRAL2000PUB1010
13 Dec 20232100ml0GOWNA2000PUB1011
08 Dec 20231100ml0Barrow/Poulaphouca Blend1400PUB1070
05 Dec 20231100ml0Cavanhill2100PUB1018
04 Dec 20231100ml0Greystones Windgates Templecarrig PWS3400PUB1003
04 Dec 20231100ml0KILMACANOGUE PUBLIC SUPPLY3400PUB1009
01 Dec 202322100ml0Mid-Galway1200PUB1038
30 Nov 20233100ml0KILLAVANEY PUBLIC SUPPLY (TINAHELY)3400PUB1072
22 Nov 20231100ml0East Waterford Water Supply Scheme3800PUB1110
20 Nov 20231100ml0Knockadoon0500PUB2506
15 Nov 20233100ml0Midleton0500PUB2406
06 Nov 20232100ml0Portlaoise PWS1600PUB1004
01 Nov 20232100ml0Slyguff0100PUB1178
16 Oct 20233100ml0Dunmanway0500PUB4404
16 Oct 20231100ml0Ballinavarry3300PUB1784
12 Oct 20235100ml0Cork City Water Supply0400PUB1001
04 Oct 2023145100ml0Foxes Den Public Water Supply2700PUB2701
03 Oct 20232100ml0DCC Zone 10700PUB1001
03 Oct 20232100ml0South Dublin Zone 40800PUB1004
02 Oct 20231100ml0Mountmellick 1 PWS1600PUB1097
02 Oct 20232100ml0Boyle Regional2600PUB1027
27 Sep 202364100ml0KNOCKANARRIGAN DAVIDSTOWN PUBLIC SUPPLY3400PUB1047
25 Sep 20233100ml0Foynes/Shannon Estuary PWS1900PUB1027
18 Sep 20231100ml0Poulaphouca Regional1400PUB1023
18 Sep 202320100ml0Poulaphouca Regional1400PUB1023
18 Sep 20238100ml0Ardcarraig Clogherinkoe1400PUB1051
13 Sep 20236100ml0Melleray3100PUB1140
12 Sep 20234.1100ml0Currenree0100PUB1177
12 Sep 20231100ml0POLLAN DAM PUB0600PUB1020
12 Sep 20231100ml0Thomastown PWS1500PUB1014
11 Sep 20231100ml0Grenagh0500PUB3206
06 Sep 20233100ml0BALLYKNOCKAN VALLEYMOUNT PUBLIC SUPPLY3400PUB1026
28 Aug 20232,420100ml0Graigcullen PWS1600PUB1066
09 Aug 20232100ml0Johnstown0500PUB4406
31 Jul 20231100ml0Barrow/Poulaphouca Blend1400PUB1070
26 Jul 2023165100ml0Hollywood / Scotstown / Bellanode2400PUB2026
20 Jul 20237100ml0Glynn3300PUB1507
14 Jul 20231100ml0LOUGH MASK RWSS2200PUB1032
10 Jul 20231100ml0POLLAN DAM PUB0600PUB1020
07 Jul 20239100ml0Kilkelly PWS2200PUB1015
05 Jul 20232100ml0Ennis PWS0300PUB1009
05 Jul 2023201100ml0Shannon/Sixmilebridge RWSS0300PUB1040
03 Jul 20231100ml0Barrow/Poulaphouca Blend1400PUB1070
28 Jun 202311100ml0Monasterevin1400PUB1020
28 Jun 202310100ml0Poulaphouca Regional1400PUB1023
28 Jun 202318100ml0Poulaphouca Regional1400PUB1023
28 Jun 20232100ml0Poulaphouca Regional1400PUB1023
28 Jun 20233100ml0Graigcullen PWS1600PUB1066
27 Jun 20231100ml0Kilconnell PWS1200PUB1030
20 Jun 20231100ml0Cork Harbour & City0500PUB3401
19 Jun 20231100ml0DCC Zone 20700PUB1002
12 Jun 20232100ml0Newcastle West PWS1900PUB1042
29 May 20236100ml0DCC Zone 10700PUB1001
22 May 20231100ml0POLLAN DAM PUB0600PUB1020
16 May 20231100ml0South Dublin Zone 20800PUB1001
10 May 202374100ml0Mullingar Regional3200PUB1005
09 May 20233100ml0Lough Talt Regional Water Supply2700PUB2702
09 May 20235100ml0Lough Talt Regional Water Supply2700PUB2702
17 Apr 20231100ml0Killadysert PWS0300PUB1008
03 Apr 202343100ml0Caragh Lake PWS 022A1300PUB1046
27 Mar 20232100ml0Borris in Ossory PWS1600PUB1007
21 Mar 20234100ml0DCC Zone 10700PUB1001
06 Mar 20231100ml0Leighlinbridge0100PUB1101
02 Mar 20238100ml0Bailieboro RWSS0200PUB0102
27 Feb 20231100ml0Carrickmacross2400PUB1005
27 Feb 20235100ml0Kirikee Public Supply3400PUB1044
24 Feb 20231100ml0Mullingar Regional3200PUB1005
10 Feb 20231100ml0Greenmount2100PUB1002
16 Jan 20232100ml0DLR Zone 61000PUB1006
12 Dec 20223100ml0Foynes/Shannon Estuary PWS1900PUB1027
08 Dec 20222100ml0Ballina Town Mixed Supply2200PUB1008
06 Dec 2022100100ml0Cavan RWSS0200PUB0100
05 Dec 20221100ml0Graigcullen PWS1600PUB1066
23 Nov 20222100ml0ARKLOW PUBLIC SUPPLY3400PUB1004
22 Nov 20221100ml0MILFORD PUB0600PUB1050
15 Nov 20222100ml0Lisava Public Water Supply3700PUB1039
14 Nov 20226100ml0Kenmare PWS 045A1300PUB1058
07 Nov 20225100ml0Knocklong PWS1900PUB1038
01 Nov 20222100ml0ARKLOW PUBLIC SUPPLY3400PUB1004
26 Oct 20222100ml0Dungarvan3100PUB1039
24 Oct 20221100ml0Kiltealy3300PUB1548
24 Oct 20221100ml0Askamore3300PUB1833
20 Oct 20222100ml0Cleggan/Claddaghduff1200PUB1011
11 Oct 20223100ml0Cork City Water Supply0400PUB1001
10 Oct 202218100ml0LANESBORO2000PUB1009
06 Oct 20221100ml0Oughterard1200PUB1041
19 Sep 20221100ml0Banteer0500PUB1401
14 Sep 202234100ml0Scarriff PWS0300PUB1006
12 Sep 20221100ml0Monee0500PUB1315
08 Sep 20222100ml0Cooley2100PUB1004
07 Sep 20221100ml0Ennis PWS0300PUB1009
06 Sep 20224100ml0Oughterard1200PUB1041
05 Sep 20222100ml0DLR Zone 71000PUB1007
01 Sep 20221100ml0Cavanhill2100PUB1018
30 Aug 20221100ml0Whitechurch0500PUB3306
30 Aug 20223100ml0Shinrone/Brosna PWS2500PUB1019
23 Aug 202212100ml0Pallasgreen PWS1900PUB1044
22 Aug 20221100ml0RAHEENGRANEY PUBLC SUPPLY3400PUB1033
02 Aug 20222100ml0LOUGH MASK RWSS2200PUB1032
19 Jul 20221100ml0Cork City Water Supply0400PUB1001
19 Jul 20221100ml0DCC Zone 10700PUB1001
18 Jul 202212100ml0WICKLOW REGIONAL SUPPLY3400PUB1005
12 Jul 20224100ml0Kealkill0500PUB4105
07 Jul 202216100ml0Leixlip Regional1400PUB1019
04 Jul 202210100ml0Limerick City Environs PWS1900PUB1032
30 Jun 20221100ml0Cooley2100PUB1004
21 Jun 20222100ml0Glengarriff0500PUB4208
21 Jun 20223100ml0South Dublin Zone 20800PUB1001
14 Jun 20226100ml0Lyreacrompane RWSS 057E1300PUB1009
13 Jun 20221100ml0BALLYMAHON2000PUB1005
08 Jun 20221100ml0Midleton0500PUB2406
07 Jun 202211100ml0Bailieboro RWSS0200PUB0102
31 May 202289100ml0Ballyshoneen0500PUB3210
25 May 20221100ml0Innishannon0500PUB3501
24 May 2022488100ml0Galway City PWS1100PUB1001
17 May 20221100ml0Ballina - Lisglennon2200PUB1004
17 May 2022201100ml0Tullamore North PWS2500PUB1025
12 May 20221100ml0South Dublin Zone 40800PUB1004
09 May 20222100ml0Rathkeale PWS1900PUB1046
06 May 20221100ml0Cavanhill2100PUB1018
05 May 20224100ml0BALLYSHANNON0600PUB1105
05 Apr 20228100ml0SRRWSS - Killeglan2600PUB1004
05 Apr 20223100ml0Aughclare, Campile3300PUB1819
21 Mar 2022201100ml0Mid Kerry : Gearha (H) 300A1300PUB1063
08 Feb 20221100ml0Charleville0500PUB1103
01 Feb 20221100ml0Ardcarraig Clogherinkoe1400PUB1051
19 Jan 20222100ml0CARNDONAGH (MIXED SUPPLY)0600PUB1007
11 Jan 20221100ml0Tibbotstown0500PUB2408
11 Jan 20229100ml0Cork Harbour & City0500PUB3401
06 Dec 20218100ml0Cork City Water Supply0400PUB1001
01 Dec 202150100ml0Cootehill PWS0200PUB0110
29 Nov 20215100ml0Drum2400PUB1007
29 Nov 20211100ml0Ballany3200PUB1004
23 Nov 202136100ml0Rathmore PWS 065A1300PUB1017
22 Nov 20211100ml0Ballyjamesduff RWSS0200PUB0106
22 Nov 20219100ml0Foynes/Shannon Estuary PWS1900PUB1027
11 Nov 2021201100ml0Cork Harbour & City0500PUB3401
08 Nov 202170100ml0Inniskeen2400PUB1009
27 Oct 20211100ml0Dunmanway0500PUB4404
27 Oct 20212100ml0South East Regional PWS1600PUB1093
26 Oct 2021194100ml0Galway City PWS1100PUB1001
13 Oct 202128100ml0Navan-Mid Meath Kilcarn PWS2300PUB1051
01 Oct 20211100ml0Cavanhill2100PUB1018
21 Sep 20211100ml0Barrow/Poulaphouca Blend1400PUB1070
13 Sep 20212100ml0Lyre0500PUB1406
13 Sep 20212100ml0Whitechurch0500PUB3306
07 Sep 2021118100ml0Coolderry PWS2500PUB1005
06 Sep 20211100ml0Ballinasloe Public Supply1200PUB1004
06 Sep 20211100ml0Fedamore PWS1900PUB1048
26 Aug 20215100ml0LETTERKENNY0600PUB1110
26 Aug 202114100ml0Mullingar Regional3200PUB1005
23 Aug 20211100ml0Bailieboro RWSS0200PUB0102
11 Aug 20212100ml0Ennistymon RWS0300PUB1004
11 Aug 20214100ml0Kilkeedy PWS0300PUB1039
28 Jul 2021201100ml0Dunkerrin PWS2500PUB1007
07 Jul 202116100ml0Kilbrin Garran an Darra0500PUB1608
24 Jun 20211100ml0Smoore3100PUB1092
15 Jun 20211100ml0Cork City Water Supply0400PUB1001
08 Jun 20211100ml0SRRWSS - Killeglan2600PUB1004
25 May 20212100ml0DLR Zone 71000PUB1007
17 May 202133100ml0Camross PWS1600PUB0082
17 May 20214100ml0Mountrath PWS1600PUB1054
21 Apr 20213100ml0WICKLOW REGIONAL SUPPLY3400PUB1005
13 Apr 20211100ml0Youghal Regional0500PUB2510
12 Apr 20211100ml0Limerick City Environs PWS1900PUB1032
09 Mar 20211100ml0DCC Zone 60700PUB1007
24 Feb 20211100ml0RAHEENGRANEY PUBLC SUPPLY3400PUB1033
19 Feb 20211100ml0Tully-Tullycross1200PUB1048
03 Feb 20212100ml0Ennis PWS0300PUB1009
01 Feb 20211100ml0South Dublin Zone 20800PUB1001
26 Jan 20215100ml0Cork Harbour & City0500PUB3401
13 Jan 202110100ml0Kilineer2100PUB1015

Places with mapped Coliform Bacteria monitoring data

Explore existing place reports with mapped Water Supply Zones containing Coliform Bacteria 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 Coliform Bacteria 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.

Coliform bacteria are not the E. coli test

The regulations list coliform bacteria and E. coli separately. A coliform record is not relabelled as E. coli, and the report makes no inference about which organism was present.

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 Coliform Bacteria report cover?

40,769 monitoring records across 5 available monitoring year(s): 2021, 2022, 2023, 2024, 2025. The selected source is Coliform Bacteria. National totals come directly from EPA records, not a sum of towns.

What is the Irish drinking-water requirement for Coliform Bacteria?

0 number/100 ml. Indicator value for public piped drinking water.

Are coliform records counted as E. coli results?

No. Coliform Bacteria and E. coli remain distinct source parameters, with separate monitoring and listed-exceedance totals.

Can I compare the recorded Coliform Bacteria 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 Coliform Bacteria 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.
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.

Read the full methodologyView data sources