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Plymouth Sound(E) at Millbay Tanks

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
Plymouth Sound(E) | 20 Spills |
92.8 hours | 0.35


The declared body of water receiving this discharge is the "Plymouth Sound(E)"
This station has discharged sewage 20 time(s).
The station has discharged for a total of 92.8 hour(s).
This is 0.35% of the time which we have data for.
In total: 3 day(s)* of elapsed time.

60.3 | 10424.3 hours
This monitor has been operational for 60.3% of its total time we have data for.
There are 10424.39 hours unaccounted for due to downtime of the monitor.


The worst year in our records for the "Millbay Tanks" is 2022, discharging sewage for 42.7 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
Plymouth Sound(E) | 11 Spills |
42.6 hours | 0.48

The declared body of water receiving this discharge is the "Plymouth Sound(E)"
This station discharged sewage 11 time(s) during 2023.
The station discharged for a total of 42.6 hour(s).
This is around 1 day(s)* or 0.48% 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 BodyThe Environment Agency
OperatorSouth West Water
Primary Permit #300820
Secondary Permit #300820

2022
Plymouth Sound(E) | 8 Spills |
42.7 hours | 0.48

The declared body of water receiving this discharge is the "Plymouth Sound(E)"
This station discharged sewage 8 time(s) during 2022.
The station discharged for a total of 42.7 hour(s).
This is around 1 day(s)* or 0.48% of the year.

30 | 6132 hours
This monitor was operational for 30% of the year.
Leaving 6132 hours unaccounted for in the data.
This falls below the 90% threshold where a reason should be given

The following reasons have been given for the downtime in 2022:
Comms Failure / Issue

The following description has been given for downtime related actions intended, or taken, by the operator in 2022:
Resolved - Sep


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

Permit & Governance

AttributeValue
Governing BodyThe Environment Agency
OperatorSouth West Water
Primary Permit #300820
Secondary Permit #300820

2021
Plymouth Sound(E) | 1 Spills |
7.5 hours | 0.08

The declared body of water receiving this discharge is the "Plymouth Sound(E)"
This station discharged sewage 1 time(s) during 2021.
The station discharged for a total of 7.5 hour(s).
This is around 0 day(s)* or 0.08% of the year.

51 | 4292.4 hours
This monitor was operational for 51% of the year.
Leaving 4292.4 hours unaccounted for in the data.
This falls below the 90% threshold where a reason should be given

The following reasons have been given for the downtime in 2021:
Comms Failure / Issue

The following description has been given for downtime related actions intended, or taken, by the operator in 2021:
N/A - Ongoing Investigation


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

Permit & Governance

AttributeValue
Governing BodyThe Environment Agency
OperatorSouth West Water
Primary Permit #300820
Secondary Permit #300820


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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
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Station Data Information
Station overseen (meaning either provided, or regulated) by: The Environment Agency
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