Whereabouts of PennrhBay /Colwyn Bay Sewage Treatment Plant ,,also amount of sewage leaks on last 2 years please .

HeatherDavies made this Environmental Information Regulations request to Welsh Water
You only have a right in law to access information about the environment from this authority
Automatic anti-spam measures are in place for this older request. Please let us know if a further response is expected or if you are having trouble responding.

The request was partially successful.

Dear Welsh Water,
as secretary of Colwyn Bay WI ,I'd like to request some information from you for the members .
As our campaign this year is LOOKING AFTER OUR RIVERS FOR PEOPLE AND WILDLIFE , we are very interested in this subject .
Please can you tell us where the main sewage works are located in our area
And , the amount and whereabouts of sewage released into our local waterways over the last years .

Yours faithfully,

Heather Davies

Environmental Information Requests, Welsh Water

Dear Heather Davies

 

Request for information

 

We refer to your request for information which was received on 24 October
2023.

 

We are dealing with your request as one made under the Environmental
Information Regulations 2004 (“the Regulations”).

 

In accordance with the Regulations, we will respond to your request within
20 working days of the date of receipt.

 

For completeness, we advise that the Information Commissioner’s Office
states that the time for responding should be calculated from the day
after the request is received.

 

In the meantime, if you have any queries, please contact us on email
[1][email address]

 

We have assigned reference EIR/1630/2023 to your request. Please kindly
note this in all correspondence with us regarding this matter.

 

Yours faithfully

 

Dŵr Cymru Welsh Water

 

 

_______________________________________________________ Dwr Cymru Welsh
Water is firmly committed to water conservation and promoting water
efficiency. Please log on to our website www.dwrcymru.com/waterefficiency
to find out how you can become water wise. Mae Dwr Cymru Welsh Water wedi
ymrwymo i warchod adnoddau dwr a hyrwyddo defnydd dwr effeithiol. Mae
cyngor i' ch helpu i ddefnyddio dwr yn ddoeth yn
www.dwrcymru.com/waterefficiency

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Emily Payne, Welsh Water

Good morning Heather,

I understand you have submitted a request for information from Welsh Water under Environmental Information Regulations, the data you've requested should follow shortly. I thought I would get in touch as I am the River Quality Liaison Manager for Welsh Water (for the North Wales area) and my role involves engaging with local stakeholders to share information about how the wastewater side of our business operates, how we interface with the environment and what plans we have to improve our services in the future.

I often speak with community groups, River Trusts, ENGO's about topics such as storm overflows, river quality, phosphorous etc. If the WI would be interested, we could arrange a session to talk about local wastewater services and perhaps have a Q&A?

Let me know what you think and if this is something that might be useful

Kind regards

Emily Payne
Welsh Water | River Quality Liaison Manager – North
Dŵr Cymru | Rheolwr Cyswllt Ansawdd Afonydd - Gogledd
[mobile number]

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Environmental Information Requests, Welsh Water

5 Attachments

Date: 21 November 2023

Our Reference: EIR/1630/2023

 

Dear Heather Davies

 

Request for information

We write further to your request for information dated 24 October 2023,
which we have been considering under
the Environmental Information Regulations 2004.

 

We can confirm that Dwr Cymru Welsh Water does hold the information you
have requested.

To answer your first question, we can confirm that we have one Wastewater
Treatment Works (WwTW’s) which serves the area. This Plant is called Ganol
WwTW and is located in Llandudno Junction.

All the sewerage flow from the Colwyn Bay and Penrhyn Bay areas including
Llandudno, Glan Conwy, Deganwy and Conwy are all pumped via numerous
pumping stations in the area to be treated and disinfected before being
pumped out via a long discharge pipe which is located offshore in the
Penrhyn Bay area, see attached a map for ease of reference. It is worth
that noting that our WwTW’s have a continuous final effluent discharge.
This is the end product of the treatment process and is fully treated and
disinfected before being released back to the environment. 

Turning your query regarding sewage released into our local waterways via
storm overflows (SO’s). It may be helpful to know that most of our sewer
network is a combined system that collects both rainwater that runs off
gutters, drains and roads, as well as wastewater from people’s homes.
Therefore, following rain and storm overflows (SOs) play a vital role in
preventing homes from being flooded. We have over 36,000kms of sewers,
covering vast areas which means that the network can become overwhelmed,
even if the rain has passed. Much of what is released from our SOs is
surface water that enters our sewers due to rainfall and is therefore very
dilute.

The operation of SOs is an activity that is highly regulated by Natural
Resource Wales (NRW) and the Environmental Agency (EA) and operate as
designed and under permits. We do recognise the concerns raised and that
more needs to be done. Investing to meet the challenges of climate change
is a key business priority for us, however this requires significant
additional funding and between now and 2025 we’ll be investing almost £100
million on improving SO’s.

We have provided you with our annual return data which is a record of how
many times in the year these storm overflows operated during storm
conditions for 2021 and 2022. We have included the assets which discharge
in the Penrhyn, Colwyn Bay area as you have requested.

We also publish our data online annually, which you may find useful,
follow this link [1]dwrcymru.com/combined-storm-overflows

However, Dŵr Cymru Welsh Water does not hold the information you have
requested as we do not measure the amount that is discharged to
environment. Our (EDM) event duration monitoring only records the number
and duration of spill events and does not record the volume of a spill
event.

It may also be helpful for you to know how we monitor our intermitted
discharges to waterbodies:

EDM is a regulatory requirement to monitor the frequency and duration of
intermittent sewage discharges such as combined sewer overflows (CSO),
sewage pumping stations (SPS) and sewage treatment works (STW) storm
tanks.

The majority of EDM monitoring is carried out using level sensors which
measure the level of sewage inside the wastewater assets. In general, a
discharge is recorded when the value of sewage level exceeds that of the
value of height of spill weir wall or an outfall pipe (spill point).

EDM monitoring of sewage discharges from Combined Sewer Overflow (CSO):

[2]A close-up of a drain Description automatically generated

 

 

 

 

 

 

 

Depending on the complexity of wastewater assets, EDM discharges may be
also recorded using other indicators as pressure sensors, storm pumps
running signal or combined signals from multiple level monitors.

EDM discharges are calculated using the 12/24-hour spill block method
using the EDM data recorded at 15-minute intervals.

[3]A diagram of a diagram Description automatically generated

 

• Any readings over the spill trigger level in the first 12-hour block
is counted as 1 spill.
• Any readings over the spill trigger level in the next and subsequent
24 hours blocks are each counted as one additional spill per block.
• This counting method continues until there is a 24-hour block with no
spills.
• After a clear 24 hour block the spill counting sequence is reset and
begins again when a reading over the spill trigger level is detected.

 

Information on 12/24 counting method can be found on Environmental Agency
website:

[4]https://www.gov.uk/government/publicatio...

For further information that maybe helpful, we have included the following
[5]link to our Manifesto for Rivers in Wales. This shows how how we’re
playing our part to help improve river water quality in Wales. We also
have additional information on river water quality [6]here.

We hope that this response is clear. Should you have any questions, you
can contact us by email at
[7][email address]

If you are dissatisfied with the handling of your request, you have the
right to ask for an internal review. Internal review requests should be
submitted within 40 working days of the date of receipt of this response
and should be addressed to Company Secretary, Dŵr Cymru Welsh Water Linea,
Fortran Road, St. Mellons, Cardiff, Wales, CF3 0LT.

If you are not content with the outcome of the internal review, you have
the right to apply directly to the Information Commissioner for a
decision.

 

Yours faithfully

Dŵr Cymru Welsh Water

 

_______________________________________________________ Dwr Cymru Welsh
Water is firmly committed to water conservation and promoting water
efficiency. Please log on to our website www.dwrcymru.com/waterefficiency
to find out how you can become water wise. Mae Dwr Cymru Welsh Water wedi
ymrwymo i warchod adnoddau dwr a hyrwyddo defnydd dwr effeithiol. Mae
cyngor i' ch helpu i ddefnyddio dwr yn ddoeth yn
www.dwrcymru.com/waterefficiency

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