River Basins Western Wales Llyn and Eryri Dwyryd Cynfal CSO At Llan Ffestiniog Sewage Treatment Works
River Basins . . . Cynfal CSO At Llan Ffestiniog Sewage Treatment Works
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Cynfal at CSO At Llan Ffestiniog Sewage Treatment Works

This is a sewage discharge monitoring station, which is usually a type of Event Duration Monitor (EDM).
These stations themselves are designed to mitigate the impact of heavy rainfall by discharging, under permitted conditions, any overflow into a water body. They are often actively discharging during flood events.
This page presents the data acquired by the monitoring system for this discharge station.
Sewage Reports that include this Station
Operational Summary - 2021-2023
Cynfal | 895 Spills |
8669.5 hours | 32.98


The declared body of water receiving this discharge is the "Cynfal"
This station has discharged sewage 895 time(s).
The station has discharged for a total of 8669.5 hour(s).
This is 32.98% of the time which we have data for.
In total: 361 day(s)* of elapsed time.

99.3 | 175.2 hours
This monitor has been operational for 99.3% of its total time we have data for.
There are 175.2 hours unaccounted for due to downtime of the monitor.


The worst year in our records for the "CSO At Llan Ffestiniog Sewage Treatment Works" is 2023, discharging sewage for 4069.2 hours of the year.

Uptimes below 90% (red line) should be accompanied by a reason
*This is total time in days, not individual days.
Yearly Summary
Most Recent Year - 2023
Cynfal | 317 Spills |
4069.2 hours | 46.45

The declared body of water receiving this discharge is the "Cynfal"
This station discharged sewage 317 time(s) during 2023.
The station discharged for a total of 4069.2 hour(s).
This is around 169 day(s)* or 46.45% of the year.

100 | 0 hours
This monitor was operational for 100% of the year.
Leaving 0 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #CG0058802
Secondary Permit #CG0058802

2022
Cynfal | 271 Spills |
2010.2 hours | 22.94

The declared body of water receiving this discharge is the "Cynfal"
This station discharged sewage 271 time(s) during 2022.
The station discharged for a total of 2010.2 hour(s).
This is around 83 day(s)* or 22.94% of the year.

99.6 | 33.2 hours
This monitor was operational for 99.6% of the year.
Leaving 33.2 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #CG0058802
Secondary Permit #CG0058802

2021
Cynfal | 307 Spills |
2590 hours | 29.56

The declared body of water receiving this discharge is the "Cynfal"
This station discharged sewage 307 time(s) during 2021.
The station discharged for a total of 2590 hour(s).
This is around 107 day(s)* or 29.56% of the year.

99.9 | 0.8 hours
This monitor was operational for 99.9% of the year.
Leaving 0.8 hours unaccounted for in the data.


*This is total time in days, not individual days of the year.

Permit & Governance

AttributeValue
Governing BodyNatural Resources Wales
OperatorDwr Cymru Welsh Water
Primary Permit #CG0058802
Secondary Permit #CG0058802


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Operator comments are presented, unedited, as they were received by us and do not reflect our views or position

Local Information
Station Data Information
Station overseen (meaning either provided, or regulated) by: Natural Resources Wales
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