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River Calder at Mill Lane 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
River Calder | 259 Spills |
2121.2 hours | 8.07


The declared body of water receiving this discharge is the "River Calder"
This station has discharged sewage 259 time(s).
The station has discharged for a total of 2121.2 hour(s).
This is 8.07% of the time which we have data for.
In total: 88 day(s)* of elapsed time.

98.6 | 350.3 hours
This monitor has been operational for 98.6% of its total time we have data for.
There are 350.39 hours unaccounted for due to downtime of the monitor.


The worst year in our records for the "Mill Lane WWTW" is 2023, discharging sewage for 1297.2 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
River Calder | 108 Spills |
1297.2 hours | 14.8

The declared body of water receiving this discharge is the "River Calder"
This station discharged sewage 108 time(s) during 2023.
The station discharged for a total of 1297.2 hour(s).
This is around 54 day(s)* or 14.8% of the year.

The following reasons have been given for the high spill frequency in 2023:
Not Asset Maintenance - Hydraulic Capacity

The following comments have been given on the station operators intended actions:
N/A - Hydraulic Capacity

99.8 | 16.6 hours
This monitor was operational for 99.8% of the year.
Leaving 16.6 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
OperatorYorkshire Water
Primary Permit #WA6472
Secondary Permit #WA6472 A2

2022
River Calder | 64 Spills |
373 hours | 4.25

The declared body of water receiving this discharge is the "River Calder"
This station discharged sewage 64 time(s) during 2022.
The station discharged for a total of 373 hour(s).
This is around 15 day(s)* or 4.25% of the year.

The following reasons have been given for the high spill frequency in 2022:
Not Asset Maintenance - Hydraulic Capacity

The following comments have been given on the station operators intended actions:
N/A - Hydraulic Capacity

99.1 | 70.9 hours
This monitor was operational for 99.1% of the year.
Leaving 70.9 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
OperatorYorkshire Water
Primary Permit #WA6472
Secondary Permit #WA6472 A2

2021
River Calder | 87 Spills |
451 hours | 5.14

The declared body of water receiving this discharge is the "River Calder"
This station discharged sewage 87 time(s) during 2021.
The station discharged for a total of 451 hour(s).
This is around 18 day(s)* or 5.14% of the year.

98 | 175.2 hours
This monitor was operational for 98% of the year.
Leaving 175.2 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
OperatorYorkshire Water
Primary Permit #WA6472
Secondary Permit #WA6472 A2


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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: The Environment Agency
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