Where we have identified any third party copyright information you will need to obtain permission from the copyright holders concerned.
This publication is available at https://www.gov.uk/government/publications/water-and-sewerage-companies-in-england-environmental-performance-report-2025/anglian-water-epa-data-report-2025
This report provides company specific data and information on the Environmental Performance Assessment (EPA) metrics. It contains current year and historic performance data (as published at the time, based on data provided in part by the water and sewerage companies). For further information on what each EPA metric and performance star ratings mean see our EPA metric guide.
In addition to the EPA metrics, this report contains a section on event duration monitoring (EDM) of storm overflows. For a comparison between water and sewerage companies and wider regulatory information see the environmental performance of the water and sewerage companies in 2025 report.
We set targets for each EPA metric. Water and sewerage company performance is then given a red, amber or green (RAG) status:
red – significantly below target
amber – below target
green – achieved target
We review and revise thresholds every 5 years.
1. EPA metric status and performance star rating
Main facts
For 2025:
red status for 2 metrics, amber status for 1 metric and green status for 3 metrics
1 of 4 water and sewerage companies (out of 9) rated as requires improvement (2 stars)
Annual performance star rating after assessment of Anglian Water’s performance across all EPA metrics
Year
Overall EPA star rating (out of 4)
Star rating description
2011
3 stars
Above average company
2012
3 stars
Above average company
2013
3 stars
Above average company
2014
3 stars
Above average company
2015
3 stars
Above average company
2016
3 stars
Good company
2017
3 stars
Good company
2018
3 stars
Good company
2019
2 stars
Company requires improvement
2020
3 stars
Good company
2021
2 stars
Company requires improvement
2022
2 stars
Company requires improvement
2023
2 stars
Company requires improvement
2024
2 stars
Company requires improvement
2025
2 stars
Company requires improvement
Annual percentage of red, amber or green (RAG) status EPA metric results for Anglian Water
Graph note: there were 6 EPA metrics in the years 2011 to 2015, 2018 to 2021, and 2025. There were 7 EPA metrics in the years 2016, 2017, 2022, 2023 and 2024.
Annual number of EPA metrics and their RAG status results for Anglian Water
Year
Number of metrics in EPA
Number of red metrics
Number of amber metrics
Number of green metrics
2011
6
0
4
2
2012
6
0
2
4
2013
6
0
3
3
2014
6
0
3
3
2015
6
0
2
4
2016
7
0
3
4
2017
7
0
4
3
2018
6
0
3
3
2019
6
1
4
1
2020
6
0
4
2
2021
6
1
3
2
2022
7
1
4
2
2023
7
2
2
3
2024
7
2
1
4
2025
6
2
1
3
2. Total pollution incidents (sewerage) metric (category 1 to 3)
Main facts
For 2025:
48 sewerage pollution incidents per 10,000km of sewer – this is rated as red
368 actual incidents (needed 149 or fewer to be rated as green)
76,437km sewer length – from financial year ending 2018 (this baseline is used in the EPA)
performance was worse than the sector (41) for sewerage pollution incidents per 10,000km of sewer
1 of 8 water and sewerage companies (out of 9) to be rated red
Annual number of pollution incidents (category 1 to 3) from Anglian Water sewerage assets, with EPA status
2011 to 2015 data
Year
2011
2012
2013
2014
2015
EPA status
amber
amber
amber
amber
green
Incidents per 10,000km sewer
118
101
89
90
35
Actual incident numbers
518
446
392
394
152
2016 to 2020 data
Year
2016
2017
2018
2019
2020
EPA status
amber
amber
green
amber
amber
Incidents per 10,000km sewer
32
30
25
35
28
Actual incident numbers
226
228
191
266
210
2021 to 2025 data
Year
2021
2022
2023
2024
2025
EPA status
amber
amber
red
red
red
Incidents per 10,000km sewer
34
33
40
57
48
Actual incident numbers
258
255
307
437
368
Annual number of pollution incidents (category 1 to 3) from Anglian Water sewerage assets, also showing EPA status and thresholds
Graph note: the EPA RAG status thresholds are set for normalised (per 10,000km sewer) numbers of sewerage incidents (see our EPA metric guide). We review and revise thresholds every 5 years. Equivalent thresholds for actual incident numbers are calculated using water and sewerage company sewer length data – these are shown in the graph background and the table below.
EPA thresholds for actual number of Anglian Water sewerage incidents for the calendar years 2011 to 2025
Calendar year
Red status
Amber status
Green status
2011 to 2015
570 or above
223 to 569
222 or below
2016
355 or above
183 to 354
182 or below
2017 to 2020
376 or above
194 to 375
193 or below
2021
318 or above
180 to 317
179 or below
2022
302 or above
172 to 301
171 or below
2023
287 or above
165 to 286
164 or below
2024
279 or above
157 to 278
156 or below
2025
264 or above
150 to 263
149 or below
Number of pollution incidents (category 1 to 3) from Anglian Water sewerage and water supply assets in 2025
Asset type
Number of pollution incidents (category 1 to 3)
Combined sewer overflow
5
Foul sewer
126
Other water industry premises
1
Pumping station
113
Rising main
43
Sewage treatment works
78
Storm tank
0
Surface water outfall
2
Water distribution system (water supply)
62
Water treatment works (water supply)
3
Note: water distribution system and water treatment works (both water supply assets) are not part of the EPA total pollution incidents (sewerage) metric.
Number of pollution incidents (total and breakdown of category 1 to 3) from Anglian Water sewerage and water supply assets in 2025
Asset type
Category 1 to 3
Category 1
Category 2
Category 3
Combined sewer overflow
5
0
0
5
Foul sewer
126
0
3
123
Other water industry premises
1
0
0
1
Pumping station
113
1
4
108
Rising main
43
0
2
41
Sewage treatment works
78
0
2
76
Storm tank
0
0
0
0
Surface water outfall
2
0
0
2
Water distribution system (water supply)
62
0
0
62
Water treatment works (water supply)
3
0
0
3
3. Serious pollution incidents (sewerage and water supply) metric (category 1 and 2)
Main facts
For 2025:
12 serious incidents – this is rated as red (needed 1 or fewer to be rated as green)
12 serious incidents from sewerage assets
0 serious incidents from water supply assets
1 of 7 water and sewerage companies (out of 9) to be rated red, no companies rated green
Annual number of serious pollution incidents (category 1 and 2) from Anglian Water assets (sewerage and from 2021 including water supply), with EPA status
2011 to 2015 data
Year
2011
2012
2013
2014
2015
EPA status
amber
green
amber
amber
amber
Serious incidents per 10,000km sewer
2
0.7
2.3
1.8
2.3
Actual serious incident numbers – sewerage
9
3
10
8
10
2016 to 2020 data
Year
2016
2017
2018
2019
2020
EPA status
amber
amber
amber
red
amber
Serious incidents per 10,000km sewer
1.3
1.2
0.8
1.6
1.3
Actual serious incident numbers – sewerage
9
9
6
12
10
2021 to 2025 data
Year
2021
2022
2023
2024
2025
EPA status
red
red
red
red
red
Serious incident numbers – all assets
14
11
11
7
12
Serious incident numbers – sewerage
14
9
11
7
12
Serious incident numbers – water supply
0
2
0
0
0
Annual number of serious pollution incidents (category 1 and 2) from Anglian Water assets (sewerage and from 2021 including water supply), also showing EPA status and thresholds
Graph note: for 2011 to 2020 EPA RAG status thresholds were set for normalised (per 10,000km sewer) numbers of serious sewerage incidents (see our EPA metric guide). Equivalent thresholds for actual serious sewerage incident numbers were calculated using water and sewerage company sewer length data. We review and revise thresholds every 5 years. For 2021 to 2025 water and sewerage companies are in one of two groups with different thresholds set for actual serious sewerage and water supply incident numbers. The thresholds for actual serious incident numbers are shown in the graph background and the table below.
EPA thresholds for number of serious incidents from Anglian Water assets (sewerage and from 2021 including water supply) for the calendar years 2011 to 2025
Calendar year
Red status
Amber status
Green status
2011 to 2015
18 or above
7 to 17
6 or below
2016
11 or above
4 to 10
3 or below
2017 to 2020
12 or above
5 to 11
4 or below
2021 and 2022
6 or above
4 or 5
3 or below
2023 and 2024
5 or above
3 or 4
2 or below
2025
4 or above
2 or 3
1 or 0
Number of serious pollution incidents (category 1 and 2) from Anglian Water sewerage and water supply assets in 2025
Asset type
Number of serious pollution incidents (category 1 and 2)
Combined sewer overflow
0
Foul sewer
3
Other water industry premises
0
Pumping station
5
Rising main
2
Sewage treatment works
2
Storm tank
0
Surface water outfall
0
Water distribution system (water supply)
0
Water treatment works (water supply)
0
4. Self-reporting of pollution incidents (sewerage and water supply) metric
Main facts
For 2025:
94% of all incidents self-reported, 95% from just pumping stations (PS) and sewage treatment works (STW) combined – this is rated as green
406 self-reported incidents, 27 incidents reported by others
performance was better than the sector (87%) for self-reporting of all pollution incidents
performance was better than the sector (93%) for self-reporting of just PS and STW pollution incidents combined
1 of 8 water and sewerage companies (out of 9) to be rated green
Annual self-reporting of pollution incidents (category 1 to 3) from Anglian Water sewerage and water supply assets, with EPA rating
2011 to 2015 data
Year
2011
2012
2013
2014
2015
EPA status
amber
green
green
green
amber
Percentage of incidents self-reported
64
71
76
76
56
Number of incidents self-reported
335
317
302
311
87
2016 to 2020 data
Year
2016
2017
2018
2019
2020
EPA status
amber
amber
amber
amber
amber
Percentage of incidents self-reported
66
71
62
71
73
Number of incidents self-reported
155
182
134
208
170
2021 to 2025 data
Year
2021
2022
2023
2024
2025
EPA status
amber
amber
green
green
green
Percentage of incidents self-reported
69
73
89
88
94
Number of incidents self-reported
193
227
300
424
406
Percentage of PS and STW incidents self-reported
75
83
95
93
95
Number of PS and STW incidents self-reported
97
105
145
178
181
Annual self-reporting of pollution incidents (category 1 to 3) from Anglian Water sewerage and water supply assets, also showing EPA status and thresholds
Graph note: the EPA RAG status thresholds (for all sewerage and water supply assets) are shown in the graph background and in the EPA metric guide. We review and revise thresholds every 5 years. From 2021 the additional number in brackets is the self-reporting percentage for just PS and STW incidents combined. To achieve green status self-reporting for all assets must be 80% or above and for just STW and PS combined must be 90% or above.
Self-reporting of pollution incidents (category 1 to 3) from Anglian Water sewerage and water supply assets in 2025
Asset type
Number of pollution incidents self-reported (category 1 to 3)
Number of pollution incidents not self-reported (category 1 to 3)
Combined sewer overflow
3
2
Foul sewer
118
8
Other water industry premises
1
0
Pumping station
109
4
Rising main
38
5
Sewage treatment works
72
6
Storm tank
0
0
Surface water outfall
1
1
Water distribution system (water supply)
61
1
Water treatment works (water supply)
3
0
Self-reporting of serious pollution incidents (category 1 to 2) from Anglian Water sewerage and water supply assets in 2025
Asset type
Number of serious pollution incidents self-reported (category 1 to 2)
Number of serious pollution incidents not self-reported (category 1 to 2)
Combined sewer overflow
0
0
Foul sewer
3
0
Other water industry premises
0
0
Pumping station
4
1
Rising main
2
0
Sewage treatment works
2
0
Storm tank
0
0
Surface water outfall
0
0
Water distribution system (water supply)
0
0
Water treatment works (water supply)
0
0
5. Discharge permit compliance (numeric) metric
Main facts
For 2025:
98.2% numeric discharge permit compliance – this is rated as amber (needed 8 or fewer non-complaint treatment works to be rated as green)
74 permitted discharge outlets from water treatment works (WTW) – 97.3% compliance (2 non-compliant WTW)
needed 8 or fewer non-compliant treatment works to be rated as green
performance was better than the sector (97.4%) for numeric discharge permit compliance
1 of 5 water and sewerage companies (out of 9) to be rated amber
Annual discharge permit compliance (numeric) for Anglian Water (STW and from 2016 includes WTW), with EPA status
2011 to 2015 data
Year
2011
2012
2013
2014
2015
EPA status
amber
amber
amber
amber
green
Percentage permit compliance
97.1
98.1
97.5
98.6
99.0
Number of permitted discharge outlets from STW
721
720
718
719
728
Number of non-compliant STW
21
14
18
10
7
2016 to 2020 data
Year
2016
2017
2018
2019
2020
EPA status
green
amber
amber
amber
green
Percentage permit compliance
99.1
98.6
98.2
98.6
99.3
Number of permitted discharge outlets from STW
718
718
756
756
756
Number of permitted discharge outlets from WTW
77
75
83
90
92
Number of non-compliant STW
3
8
10
9
3
Number of non-compliant WTW
4
3
5
3
3
2021 to 2025 data
Year
2021
2022
2023
2024
2025
EPA status
amber
amber
amber
green
amber
Percentage permit compliance
98.2
98.6
98.4
99.3
98.2
Number of permitted discharge outlets from STW
754
752
751
750
749
Number of permitted discharge outlets from WTW
89
85
85
84
74
Number of non-compliant STW
14
10
10
6
13
Percentage compliance STW
98.1
98.7
98.7
99.2
98.3
Number of non-compliant WTW
1
2
3
0
2
Percentage compliance WTW
98.9
97.6
96.5
100.0
97.3
Annual discharge permit compliance (numeric) for Anglian Water (STW and from 2016 includes WTW), also showing EPA status and thresholds
Graph note: the EPA RAG status thresholds are shown in the graph background and in the EPA metric guide. We review and revise thresholds every 5 years.
6. Delivery of the Water Industry National Environment Programme (WINEP) metric
Main facts
For the financial year ending March 2026 (cumulative progress years 1 to 5 of the WINEP):
100% EPA schemes completed within planned deadlines – this is rated as green
144 EPA schemes completed within planned deadlines
performance was better than the sector (80.2%)
1 of 5 water and sewerage companies (out of 9) to be rated green
1 non-EPA WINEP schemes completed out of 1 planned – 100% total WINEP delivery (EPA and non-EPA schemes)
Annual delivery of the National Environment Programme (NEP, WINEP from April 2020) by Anglian Water, with EPA rating
Data for financial years ending 2012 to 2016
Financial year ending
2012
2013
2014
2015
2016
Asset Management Plan (AMP)
AMP5
AMP5
AMP5
AMP5
AMP6
EPA status
green
green
green
green
green
Percentage of NEP complete to date (cumulative)
114
103
100
100
100
Cumulative number of schemes completed during AMP period
25
98
97
162
1
Data for financial years ending 2017 to 2021
Financial year ending
2017
2018
2019
2020
2021
Asset Management Plan (AMP)
AMP6
AMP6
AMP6
AMP6
AMP7
EPA status
green
green
green
green
green
Percentage of NEP/WINEP complete to date (cumulative)
100
100
100
100
100
Cumulative number of schemes completed during AMP period
71
204
209
358
136
Data for financial years ending 2022 to 2026
Financial year ending
2022
2023
2024
2025
2026
Asset Management Plan (AMP)
AMP7
AMP7
AMP7
AMP7
AMP8
EPA status
green
amber
amber
amber
green
Percentage of WINEP complete within deadlines (to date)
100
99.7
99.6
99.4
100
Cumulative number of schemes completed during AMP period
474
587
717
1,106
144
Cumulative number of water quality schemes completed during AMP period
324
434
560
849
141
Cumulative number of water resources schemes completed during AMP period
123
123
125
219
1
Cumulative number of fisheries, biodiversity and geomorphology schemes completed during AMP period
27
30
32
38
2
Annual delivery of the WINEP (National Environment Programme up to the financial year ending 2020) by Anglian Water, also showing EPA status and thresholds
Table and graph note 1: AMP5 schemes that were completed early before their planned year were included in the cumulative delivery percentage (in some cases resulting in percentages over 100%). AMP6 and AMP7 schemes that were completed early before their planned year are not included in the cumulative delivery percentage until their planned year (cannot report over 100%). The EPA RAG status thresholds are in the EPA metric guide. We review and revise thresholds every 5 years.
Table and graph note 2: the WINEP EPA metric data for financial year ending 2023 is different to the EPA metric data published in July 2023. This is as a result of subsequent audits and checking.
7. Sludge disposal and use metric
Main facts
For 2025:
100% satisfactory sludge disposal and use – this is rated as green
87,936t (tonnes dry solid) total volume dispatched
21,372ha (hectares) land used by them for spreading
100% of sludge dispatched was used by them in agriculture
1 of 8 water and sewerage companies (out of 9) to report 100% satisfactory sludge disposal and use – all water and sewerage companies rated green
Annual compliance with sludge disposal and use metric by Anglian Water, with EPA ratings
2011 to 2015 data
Year
2011
2012
2013
2014
2015
EPA status
green
green
green
green
green
Percentage of sludge compliant
100
100
100
100
100
Total volume of sludge dispatched (t thousands dry solid)
102.4
99.6
106.6
102.8
98.8
2016 to 2020 data
Year
2016
2017
2018
2019
2020
EPA status
green
green
no data
no data
no data
Percentage of sludge compliant
100
100
no data
no data
no data
Total volume of sludge dispatched (t thousands dry solid)
103.7
98.2
110.2
90.6
82.5
2021 to 2025 data
Year
2021
2022
2023
2024
2025
EPA status
no data
green
green
green
green
Percentage of sludge compliant
no data
99.96
99.43
100
100
Total volume of sludge dispatched (t thousands dry solid)
96.2
97.6
101.5
84.5
87.9
Table note: for the 2018 to 2021 calendar years, we suspended the metric from the EPA whilst we reviewed our regulatory regime for sludge. The EPA RAG status thresholds are in the EPA metric guide.
Annual summary of sewage sludge disposal and use (dry matter) by Anglian Water
Year
Sewage sludge used by them in agriculture (t thousands)
Sewage sludge recovered by them non-agriculture (t thousands)
Sewage sludge disposed of by them or passed to other outlets (t thousands)
2021
92.8
3.4
0.0
2022
95.0
2.6
0.0
2023
100.4
1.1
0.0
2024
84.5
0.0
0.0
2025
87.9
0.0
0.0
8. Event Duration Monitoring (EDM) delivery
We have published the EDM storm overflow annual return dataset received from water and sewerage companies. This shows how often and how long the monitored storm overflows operated during 2025. The dataset also includes water and sewerage company reasons for performance issues with monitors and reasons for high spill counts.
Anglian Water storm overflows
Year
2025
Total number of active storm overflows listed in the annual return
1,442
Total number of active storm overflows with EDM commissioned
1,442
Percentage of active storm overflows listed with EDM commissioned
100%
Total number of storm overflows with spill data
1,438
Percentage of storm overflows listed with spill data
99.7%
Average number of spills per storm overflow with spill data
12.0
Average duration (hours) per monitored spill event
6.1
Percentage storm overflows with ≥90% EDM operation during reporting period
