Caernarfon Bay South at Nefyn Pumping Station
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.
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
3521 hours | 13.39
The declared body of water receiving this discharge is the "Caernarfon Bay South"
This station has discharged sewage 403 time(s).
The station has discharged for a total of 3521 hour(s).
This is 13.39% of the time which we have data for.
In total: 146 day(s)* of elapsed time.
99 | 262.8 hours
This monitor has been operational for 99% of its total time we have data for.
There are 262.8 hours unaccounted for due to downtime of the monitor.
The worst year in our records for the "Nefyn Pumping Station" is 2023, discharging sewage for 1718.5 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
1718.5 hours | 19.61
The declared body of water receiving this discharge is the "Caernarfon Bay South"
This station discharged sewage 156 time(s) during 2023.
The station discharged for a total of 1718.5 hour(s).
This is around 71 day(s)* or 19.61% of the year.
99.9 | 2.6 hours
This monitor was operational for 99.9% of the year.
Leaving 2.6 hours unaccounted for in the data.
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | Natural Resources Wales |
| Operator | Dwr Cymru Welsh Water |
| Primary Permit # | CG0138901 |
| Secondary Permit # | CG0138901 |
2022
421.5 hours | 4.81
The declared body of water receiving this discharge is the "Caernarfon Bay South"
This station discharged sewage 99 time(s) during 2022.
The station discharged for a total of 421.5 hour(s).
This is around 17 day(s)* or 4.81% of the year.
99.9 | 2.6 hours
This monitor was operational for 99.9% of the year.
Leaving 2.6 hours unaccounted for in the data.
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | Natural Resources Wales |
| Operator | Dwr Cymru Welsh Water |
| Primary Permit # | CG0138901 |
| Secondary Permit # | CG0138901 |
2021
1381 hours | 15.76
The declared body of water receiving this discharge is the "Caernarfon Bay"
This station discharged sewage 148 time(s) during 2021.
The station discharged for a total of 1381 hour(s).
This is around 57 day(s)* or 15.76% of the year.
99.9 | 8.7 hours
This monitor was operational for 99.9% of the year.
Leaving 8.7 hours unaccounted for in the data.
*This is total time in days, not individual days of the year.
Permit & Governance
| Attribute | Value |
|---|---|
| Governing Body | Natural Resources Wales |
| Operator | Dwr Cymru Welsh Water |
| Primary Permit # | CG0138901 |
| Secondary Permit # | CG0138901 |
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Local Information
Station Data Information
Station overseen (meaning either provided, or regulated) by: Natural Resources Wales
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Please note that FloodMapper does not verify or check the accuracy of the data provided by third parties. The data is used as received from the source. Any underlying errors, inconsistencies, or inaccuracies in the original data will be reflected in the information presented on our platform. Users are advised to exercise their own judgment and caution when using the data for decision-making purposes.
Information about our data sources and licenses can be found
The information displayed here is used under license. We are not affiliated with any governing, or other, bodies. Nor do they necessarily endorse us, or us them.
Please note that FloodMapper does not verify or check the accuracy of the data provided by third parties. The data is used as received from the source. Any underlying errors, inconsistencies, or inaccuracies in the original data will be reflected in the information presented on our platform. Users are advised to exercise their own judgment and caution when using the data for decision-making purposes.
Information about our data sources and licenses can be found
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