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Nant Peris at Llanberis WWTW

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
Nant Peris | 406 Spills |
3006.5 hours | 11.44


The declared body of water receiving this discharge is the "Nant Peris"
This station has discharged sewage 406 time(s).
The station has discharged for a total of 3006.5 hour(s).
This is 11.44% of the time which we have data for.
In total: 125 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 "Llanberis WWTW" is 2023, discharging sewage for 1148.2 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
Nant Peris | 165 Spills |
1148.2 hours | 13.1

The declared body of water receiving this discharge is the "Nant Peris"
This station discharged sewage 165 time(s) during 2023.
The station discharged for a total of 1148.2 hour(s).
This is around 47 day(s)* or 13.1% 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 #CG0089101
Secondary Permit #CG0089101

2022
Nant Peris | 109 Spills |
722.5 hours | 8.24

The declared body of water receiving this discharge is the "Nant Peris"
This station discharged sewage 109 time(s) during 2022.
The station discharged for a total of 722.5 hour(s).
This is around 30 day(s)* or 8.24% 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 #CG0089101
Secondary Permit #CG0089101

2021
132 Spills |
1135.7 hours | 12.96

This station discharged sewage 132 time(s) during 2021.
The station discharged for a total of 1135.7 hour(s).
This is around 47 day(s)* or 12.96% of the year.

99.8 | 9.6 hours
This monitor was operational for 99.8% of the year.
Leaving 9.6 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 #CG0089101
Secondary Permit #CG0089101


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