River Basins Western Wales Llyn and Eryri Dwyryd Cynfal CSO At Llanffestiniog STW
River Basins . . . Cynfal CSO At Llanffestiniog STW
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Cynfal at CSO At Llanffestiniog STW

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 | 358 Spills |
3129 hours | 11.9

The declared body of water receiving this discharge is the "Cynfal"
This station has discharged sewage 358 time(s).
The station has discharged for a total of 3129 hour(s).
This is 11.9% of the time which we have data for.
In total: 130 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 Llanffestiniog STW" is 2023, discharging sewage for 1388.2 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 | 149 Spills |
1388.2 hours | 15.84
The declared body of water receiving this discharge is the "Cynfal"
This station discharged sewage 149 time(s) during 2023.
The station discharged for a total of 1388.2 hour(s).
This is around 57 day(s)* or 15.84% 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 #CG0058803
Secondary Permit #CG0058803

2022
Cynfal | 93 Spills |
659 hours | 7.52
The declared body of water receiving this discharge is the "Cynfal"
This station discharged sewage 93 time(s) during 2022.
The station discharged for a total of 659 hour(s).
This is around 27 day(s)* or 7.52% 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 #CG0058803
Secondary Permit #CG0058803

2021
Cynfal | 116 Spills |
1081.7 hours | 12.34
The declared body of water receiving this discharge is the "Cynfal"
This station discharged sewage 116 time(s) during 2021.
The station discharged for a total of 1081.7 hour(s).
This is around 45 day(s)* or 12.34% 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 #CG0058803
Secondary Permit #CG0058803

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