River Basins Gorad Ps Gorad Nr Valley Anglesey
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Holyhead Strait at Gorad Ps Gorad Nr Valley Anglesey

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.
Operational Summary - 2021-2023
Holyhead Strait | 91 Spills |
277.7 hours | 1.05


The declared body of water receiving this discharge is the "Holyhead Strait"
This station has discharged sewage 91 time(s).
The station has discharged for a total of 277.7 hour(s).
This is 1.05% of the time which we have data for.
In total: 11 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 "Gorad Ps Gorad Nr Valley Anglesey" is 2023, discharging sewage for 125.2 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
Holyhead Strait | 39 Spills |
125.2 hours | 1.42

The declared body of water receiving this discharge is the "Holyhead Strait"
This station discharged sewage 39 time(s) during 2023.
The station discharged for a total of 125.2 hour(s).
This is around 5 day(s)* or 1.42% of the year.

99.9 | 3.5 hours
This monitor was operational for 99.9% of the year.
Leaving 3.5 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 #CG0146901
Secondary Permit #CG0146901

2022
Holyhead Strait | 22 Spills |
60.7 hours | 0.69

The declared body of water receiving this discharge is the "Holyhead Strait"
This station discharged sewage 22 time(s) during 2022.
The station discharged for a total of 60.7 hour(s).
This is around 2 day(s)* or 0.69% of the year.

99.2 | 65.7 hours
This monitor was operational for 99.2% of the year.
Leaving 65.7 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 #CG0146901
Secondary Permit #CG0146901

2021
Un-Named - Crigyll/Caradog Catchment | 30 Spills |
91.7 hours | 1.04

The declared body of water receiving this discharge is the " Un-Named - Crigyll/Caradog Catchment"
This station discharged sewage 30 time(s) during 2021.
The station discharged for a total of 91.7 hour(s).
This is around 3 day(s)* or 1.04% 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 #CG0146901
Secondary Permit #CG0146901


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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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