- Drinking Water 2024 – Summary of the Chief Inspector’s report for drinking water in Wales
- Foreword
- Water supplies and testing
- Compliance with standards
- Learning from compliance failures
- Learning from events
- Consumer contacts
- Asset health
- Water safety planning and risk assessment
- Raw water
- Poly and perfluoroalkyl substances (PFAS)
- Audit programme
- Recommendations
- Enforcement
- SEMD
- NIS
- Materials in contact with drinking water (Regulation 31)
- Research publications
- Whistleblowers
- Working with stakeholders
- Annex A – Number of tests carried out by companies
- Annex B – Compliance with standards
- Annex C – Compliance failures and events
Annex C – Compliance failures and events
Scoring compliance failures
| Company | Site name | Parameter | Sample date | Assessment | CRI |
|---|---|---|---|---|---|
| DWR | Bretton works Final | Coliform bacteria | 15/05/2024 | Covered by Legal Instrument | 0.377 |
| DWR | Barry / Sully | Iron | 25/03/2024 | Covered by Legal Instrument | 0.261 |
| HDC | Saltney | Odour | 30/08/2024 | Suggestions made | 0.357 |
| HDC | Saltney | Taste | 30/08/2024 | Suggestions made | 0.357 |
| DWR | Conwy | Iron | 12/07/2024 | Covered by Legal Instrument | 0.367 |
| DWR | Abergavenny / Cwmtillery | Taste | 24/04/2024 | Covered by Legal Instrument | 0.306 |
| DWR | Abergavenny / Cwmtillery | Manganese | 24/04/2024 | Covered by Legal Instrument | 0.306 |
| DWR | Hereford Central / North | Iron | 21/11/2024 | Covered by Legal Instrument | 0.338 |
| DWR | Hereford Central / South | Iron | 21/10/2024 | Covered by Legal Instrument | 0.167 |
| DWR | Llyswen | Iron | 13/12/2024 | Covered by Legal Instrument | 0.039 |
| DWR | Llyswen | Iron | 25/10/2024 | Covered by Legal Instrument | 0.039 |
| HDC | Rhos | Iron | 02/07/2024 | Satisfactory investigation, did not identify cause | 0.167 |
| DWR | Holywell / Mold | Taste | 05/07/2024 | Suggestions made | 0.162 |
| DWR | Monmouth / Trellech | Iron | 04/01/2024 | Covered by Legal Instrument | 0.058 |
| DWR | Rassau / Sirhowy Valley | Taste | 19/06/2024 | Covered by Legal Instrument | 0.155 |
| DWR | Windmill Hill service reservoir | Coliform bacteria | 19/09/2024 | Covered by Legal Instrument | 0.151 |
| HDC | Penrhos service reservoir | Coliform bacteria | 16/07/2024 | Suggestions made | 0.142 |
| DWR | Tram Road service reservoir | Coliform bacteria | 27/02/2024 | Covered by Legal Instrument | 0.115 |
| DWR | Abergavenny / Cwmtillery | Taste | 12/08/2024 | Trivial | 0.076 |
| HDC | Brymbo High | Coliform bacteria (zone) | 30/09/2024 | Satisfactory investigation, did not identify cause | 0.066 |
| DWR | Newport | Iron | 22/02/2024 | Covered by Legal Instrument | 0.245 |
| DWR | Newport West | Iron | 14/06/2024 | Covered by Legal Instrument | 0.184 |
| DWR | Brandy Hill service reservoir | Coliform bacteria | 20/08/2024 | Covered by Legal Instrument | 0.056 |
| DWR | Malpas / Caerleon / Cwmbran | Coliform bacteria (zone) | 11/12/2024 | Satisfactory investigation, did not identify cause | 0.053 |
| DWR | Bontgoch | Odour | 08/04/2024 | Recommendations made | 0.052 |
| DWR | Bontgoch | Taste | 08/04/2024 | Recommendations made | 0.052 |
| DWR | Bontgoch | Odour | 25/04/2024 | Recommendations made | 0.052 |
| DWR | Bontgoch | Taste | 25/04/2024 | Recommendations made | 0.052 |
| DWR | Bontgoch | Odour | 08/07/2024 | Recommendations made | 0.052 |
| DWR | Bontgoch | Taste | 08/07/2024 | Recommendations made | 0.052 |
| DWR | Penderyn | Iron | 10/04/2024 | Covered by Legal Instrument | 0.05 |
| DWR | Bryngwyn / Portis | Coliform bacteria (zone) | 05/12/2024 | Satisfactory investigation, did not identify cause | 0.04 |
| DWR | Builth works Final | Coliform bacteria | 20/03/2024 | Covered by Legal Instrument | 0.043 |
| DWR | Penarth / Barry | Coliform bacteria (zone) | 14/03/2024 | Satisfactory investigation, did not identify cause | 0.022 |
| DWR | Port Talbot / Skewen | Iron | 04/04/2024 | Covered by Legal Instrument | 0.157 |
| DWR | Whitbourne | Iron | 27/11/2024 | Covered by Legal Instrument | 0.059 |
| DWR | Bodafon service reservoir | Coliform bacteria | 07/08/2024 | Covered by Legal Instrument | 0.034 |
| DWR | Penlan Goodwick service reservoir | Coliform bacteria | 29/07/2024 | Covered by Legal Instrument | 0.015 |
| DWR | Penparc service reservoir | Coliform bacteria | 26/02/2024 | Covered by Legal Instrument | 0.013 |
| DWR | Meifod service reservoir | Coliform bacteria | 19/06/2024 | Covered by Legal Instrument | 0.01 |
| DWR | Newlands service reservoir | Coliform bacteria | 30/10/2024 | Covered by Legal Instrument | 0.008 |
| HDC | Cefn Twlch service reservoir | Coliform bacteria | 05/04/2024 | Recommendations made | 0.008 |
| DWR | Hawarden service reservoir | Coliform bacteria | 10/12/2024 | Unlikely to Recur | 0.006 |
| DWR | Plas Talgarth service reservoir | Coliform bacteria | 02/09/2024 | Covered by Legal Instrument | 0.002 |
| DWR | Rhymney / Bargoed | Lead | 04/12/2024 | Unlikely to Recur | 0.002 |
| HDC | Concessionary Supplies | Colour | 22/02/2024 | Recommendations made | 0.001 |
| DWR | Pencoed / Bridgend Valleys | Coliform bacteria (zone) | 01/03/2024 | Unlikely to Recur | 0.049 |
Events in 2024
| Company | Event name | Cause of event | Final Assessment | ERI |
|---|---|---|---|---|
| HDC | Saltney Taste & Odour | Treatment failure upstream of final disinfection | 4 | 240.065 |
| DWR | Talybont works Taste and Odour | Raw water deterioration | 4 | 94.471 |
| DWR | Tynywaun works Turbidity | Structural failure – Treatment works | 4 | 57.096 |
| DWR | Glascoed Taste and Odour | Raw water deterioration | 3 | 16.664 |
| HDC | Newtown Lead Do Not Drink | Company communication pipe problem | 4 | 15.03 |
| DWR | Llanrumney Burst Main | Mains problem/ damage – Mains – Burst | 3 | 5.972 |
| DWR | Gilfach Fargoed Loss of Supply | Mains problem/ damage – Mains – Burst | 4 | 4.599 |
| DWR | Rhydlafar Burst Main | Mains problem/ damage – Mains – Burst | 4 | 2.737 |
| DWR | Abergavenny 3rd Party Damage | Mains problem/ damage – Mains – Damage by Third Party/Unknown | 4 | 2.500 |
| DWR | Pengarnddu Old service reservoir | Animalcules | 1 | 2.090 |
| DWR | St Asaph Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 3 | 0.766 |
| DWR | Llwynypia Quarry Loss of Supply | Mains problem/ damage – Mains – Damage by Third Party/Unknown | 4 | 0.708 |
| DWR | Abergavenny Boil Water Notice | Satisfactory investigation, did not identify root cause | 4 | 0.175 |
| HDC | Newtown Taste and Odour | Consumer’s distribution system | 3 | 0.153 |
| DWR | Strata Florida works Turbdity | Plant failure – Failure – Sensors or Meters | 2 | 0.084 |
| HDC | Brymbo Low Do Not Drink | Consumer’s distribution system | 1 | 0.068 |
| HDC | Llwyn Onn Gravity Do Not Drink | Satisfactory investigation, did not identify root cause | 1 | 0.051 |
| HDC | Newtown Do Not Drink Ingress | Mains problem/ damage – Mains – Burst | 3 | 0.033 |
| DWR | Penybont works High Turbidity | Other – Specify Below: Defective non return valve on pumping main between site and off site contact cum distribution storage tank caused depressuristaion of said main. This led to unapprehended turbidity at the inlet to the reservoir on recharge and final water turbidity spike above 1 NTU for approx 1 hour as a result. | 4 | 0.032 |
| HDC | Brymbo High Do Not Drink | Consumer’s distribution system | 3 | 0.031 |
| DWR | Capel Iwan Do Not Drink | Back Siphonage | 3 | 0.018 |
| DWR | Penybont works Turbidity | Mains problem/ damage – Mains – Burst | 3 | 0.013 |
| DWR | LLANNERCH-Y-MEDD, Do Not Drink | Cross Connection | 1 | 0.011 |
| DWR | Llangorse- Do Not Drink | Satisfactory investigation, did not identify root cause | 1 | 0.010 |
| HDC | Legacy T&O Do Not Drink | Satisfactory investigation, did not identify root cause | 3 | 0.01 |
| DWR | Barry Do Not Drink | Cross Connection | 2 | 0.007 |
| DWR | Bodorgan Boil Water Notice | Satisfactory investigation, did not identify root cause | 4 | 0.004 |
| DWR | Butetown Do Not Drink | Consumer’s distribution system | 1 | 0.004 |
| DWR | Morriston Do Not Drink | Consumer’s distribution system | 3 | 0.003 |
| DWR | Llangernyw Precautionary Boil Water Notice | Other – Specify Below: Suspected ingress into temporary overland main suspected following observation of submerged feed standpipe. Subsequent investigation identified a leaking seal on said standpipe, system under 50 m head positive pressure throughout and two sets of downstream samples returned satisfactory results. | 1 | 0.003 |
| DWR | Chepstow Do Not Drink | Mains problem/ damage – Mains – Damage by Third Party/Unknown | 1 | 0.002 |
| HDC | Llanidloes T&O | Satisfactory investigation, did not identify root cause | 1 | 0.002 |
| DWR | Llandysul Do Not Drink | Mains problem/ damage – Mains – Burst | 1 | 0.001 |
| DWR | Hereford Do Not Drink | Consumer’s distribution system | 1 | 0.001 |
| DWR | Grosmont Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 3 | 0.001 |
| DWR | Neath Do Not Drink | Consumer’s distribution system | 3 | 0.001 |
| DWR | Tredegar Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 3 | 0.001 |
| DWR | Llanelli Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 4 | 0.001 |
| DWR | Pontarddulais Do Not Drink | Satisfactory investigation, did not identify root cause | 1 | 0.001 |
| DWR | Blackwood Do Not Drink | Consumer’s distribution system | 1 | 0.001 |
| DWR | Dolwen Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 2 | 0.000 |
| DWR | Tonypandy Boil Water Notice | Consumer’s distribution system | 1 | 0.000 |
| DWR | Caernarfon Do Not Drink | Consumer’s distribution system | 1 | 0.000 |
| DWR | Drefach Do Not Drink | Consumer’s distribution system | 1 | 0.000 |
| DWR | Fairwater Do Not Drink | Consumer’s distribution system | 1 | 0.000 |
| DWR | Kington Do Not Drink | Consumer’s distribution system | 2 | 0.000 |
| DWR | Treharris Do Not Drink | Satisfactory investigation, did not identify root cause | 1 | 0.000 |
| DWR | Rhyl Do Not Drink | Consumer’s distribution system | 1 | 0.000 |
| DWR | Monmouth Do Not Drink | Consumer’s distribution system | 1 | 0.000 |
| DWR | Newport Do Not Drink | Consumer’s distribution system | 1 | 0.000 |
| DWR | Brecon Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 1 | 0.000 |
| DWR | Llandysul Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 1 | 0.000 |
| DWR | Narberth Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 1 | 0.000 |
| DWR | Holyhead Do Not Drink | Ground Contamination / Spillage – Hydrocarbon | 1 | 0.000 |
| DWR | Denbigh Do Not Drink | Consumer’s distribution system | 1 | 0.000 |
| DWR | Chepstow- Precautionary Do Not Drink | Discoloured water – cause unknown at present | 1 | 0.000 |
| DWR | Bridgend Boil Water Notice | Consumer’s distribution system | 1 | 0.000 |