Dwr Cymru Welsh Water · overflow Llanfachraeth WwTW Overflow
No active event
Recorded by the operator as River Alaw.
The monitor for overflow Llanfachraeth WwTW Overflow (operator listed as Dwr Cymru Welsh Water) reports no current spill. The data records 39 spill events totalling 15.5 h in the last 30 days.
📍 53.30865°, -4.53230°
2,258
spill events
239h
cumulative discharge
3.2 h
longest single event
2026-05-06
first event on record
In the last 30 days this overflow recorded 15h of discharge. Across Dwr Cymru Welsh Water's 2,359 monitored overflows the median was 1h. This site is in the top 16% by 30-day spill duration.
3 other overflows discharge into the River Alaw. Combined recorded discharge in the last 30 days: 4h.
No surface-water sampling points within 5 km.
The record above is verifiable from public Environment Agency and water-company data. Three official accountability channels — pre-filled with the evidence on this page.
If you can see foam, sewage debris, dead fish, or smell something wrong — submit a citizen report. Confirmed reports are added to the Truth Engine and strengthen the public record on this overflow.
📷 Report what you saw →The official complaints route. Most companies require submission through their web form rather than email — open the form, then paste the pre-filled letter.
Subject: Storm overflow Llanfachraeth WwTW Overflow on the River Alaw: request for information Dear Dwr Cymru Welsh Water, I am writing about storm overflow Llanfachraeth WwTW Overflow on the River Alaw. Environment Agency storm overflow monitoring data for overflow Llanfachraeth WwTW Overflow on the River Alaw (operator listed as Dwr Cymru Welsh Water) records 39 spill events starting between 5 October 2026 and 4 November 2026; the 34 with a published end time total 15.5 h. The most recent recorded event started on 1 November 2026 at 11:10 UTC. As of 4 November 2026 at 16:53 UTC, the monitor does not report the overflow as spilling. Further details from the public record: - On the Afon Alaw, per the OS Open Rivers network (Ordnance Survey, Open Government Licence) - Location: 53.30865, -4.53230 - Sources: Environment Agency National Storm Overflow Hub and Water Quality Archive (Open Government Licence v3.0), cross-referenced via River Truth (https://rivertruth.co.uk/overflow/13565) These figures are taken from public monitoring data as published and may be revised by the publisher. They are not a finding that any permit condition has been breached. [Add your personal context here, for example how you use this stretch of water.] Please could you tell me: 1. Whether the monitoring record summarised above is accurate and complete 2. What caused the recorded spill events 3. What work, if any, is planned at this overflow, and on what timeline 4. What measures are in place to reduce spills from this overflow in future [Delete if not applicable: I have copied the Environment Agency, Ofwat and my MP into this correspondence.] Yours faithfully, [Your name] [Your address] [Your customer reference if you are a Dwr Cymru Welsh Water customer]
This overflow sits in the Ynys Môn constituency — currently represented by Llinos Medi (Plaid Cymru). Click below to open WriteToThem with the letter copied to your clipboard — paste it into the message box.
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Subject: Constituent query: storm overflow Llanfachraeth WwTW Overflow on the River Alaw Dear [your MP, WriteToThem will fill this in], I am writing as your constituent about public storm overflow monitoring data for our area. Environment Agency storm overflow monitoring data for overflow Llanfachraeth WwTW Overflow on the River Alaw (operator listed as Dwr Cymru Welsh Water) records 39 spill events starting between 5 October 2026 and 4 November 2026; the 34 with a published end time total 15.5 h. The most recent recorded event started on 1 November 2026 at 11:10 UTC. As of 4 November 2026 at 16:53 UTC, the monitor does not report the overflow as spilling. Further details from the public record: - On the Afon Alaw, per the OS Open Rivers network (Ordnance Survey, Open Government Licence) - Location: 53.30865, -4.53230 - Sources: Environment Agency National Storm Overflow Hub and Water Quality Archive (Open Government Licence v3.0), cross-referenced via River Truth (https://rivertruth.co.uk/overflow/13565) These figures are taken from public monitoring data as published and may be revised by the publisher. They are not a finding that any permit condition has been breached. [Add your personal context here, for example how you and your family use this stretch of water.] I would like to ask: 1. Whether you support strengthening the regulatory regime for storm overflows, and monitor coverage in particular 2. Whether you would raise the monitoring data for this overflow with the Secretary of State for Environment, Food and Rural Affairs, the Environment Agency or Ofwat Yours sincerely, [Your name] [Your address (WriteToThem requires a postal address to verify your constituency)]
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For active pollution incidents — dead fish, foam, sewage on the riverbank — the EA hotline operates 24/7 and triggers a recorded investigation.