Research and analysis

Wessex Water EPA data report 2019

Published 2 October 2020

Applies to England

This report provides company specific data and information on the Environmental Performance Assessment (EPA) metrics. It contains current year and historic performance data. For further information on what each EPA metric means see our EPA metric guide.

In addition to the EPA metrics this report contains a section on event duration monitoring (EDM) delivery. For a comparison between water companies and wider regulatory information see the Environmental performance of the water and sewerage companies in 2019 report.

We set targets for each EPA metric. Company performance is then given a red, amber or green (RAG) status:

• red - performance significantly below target
• amber - performance close to or slightly below target
• green - performance better than target

The thresholds are reviewed every 5 years.

1. EPA performance star rating

Annual performance star rating after assessment of Wessex Water’s performance across all EPA metrics

Year	Overall EPA star rating (out of 4)	Star rating description
2019	★★★★	Industry leading company
2018	★★★☆	Good company
2017	★★★★	Industry leading company
2016	★★★★	Industry leading company
2015	★★★★	Industry leading company
2014	★★★☆	Above average company
2013	★★★☆	Above average company
2012	★★★★	Industry leading company
2011	★★★★	Industry leading company

2. Total pollution incidents (sewerage) metric (category 1 to 3)

Main facts

For 2019:

• 76 actual incidents
• 35% fewer incidents per 10,000km sewer than in 2011
• 34,551km sewer length

Annual number of pollution incidents (category 1 to 3) from Wessex Water sewerage assets, with EPA rating

2011 to 2015 data

Year	2011	2012	2013	2014	2015
EPA status	green	green	green	green	green
Incidents per 10,000km sewer	34	35	48	44	48
Actual incident numbers	58	61	83	76	83

2016 to 2020 data

Year	2016	2017	2018	2019	2020
EPA status	green	green	green	green	N/A
Incidents per 10,000km sewer	22	23	24	22	N/A
Actual incident numbers	75	80	82	76	N/A

Annual number of pollution incidents (category 1 to 3) from Wessex Water sewerage assets, also showing EPA status and thresholds

Graph note: the thresholds for a RAG status are shown in the graph background. EPA thresholds for normalised incidents (per 10,000km sewer) are shown in the EPA metric guide. They are revised every 5 years. Sewer length data was collected in 2011, then reviewed and adjusted where necessary in following years. Sewer length affects the actual number of incidents required to fall within a particular RAG status:

• green status for Wessex Water was equivalent to ≤87 actual incidents in 2011 to 2015, ≤85 in 2016 and ≤88 in 2017 to 2019
• red status for Wessex Water was equivalent to ≥224 actual incidents in 2011 to 2015, ≥166 in 2016 and ≥172 in 2017 to 2019

Number of pollution incidents (category 1 to 3) from Wessex Water sewerage and clean water supply assets in 2019

Asset type	Number of pollution incidents (category 1 to 3)
Combined sewer overflow	4
Foul sewer	31
Other water industry premises	0
Pumping station	5
Rising main	9
Sewage treatment works	24
Storm tank	0
Surface water outfall	3
Water distribution system (clean)*	30
Water treatment works (clean)*	4

*Water distribution system (clean water supply) and water treatment works (clean water supply) are not part of the EPA total pollution incident (sewerage) metric.

For sewerage pollution incidents (category 1 to 3) we expect all water companies to achieve green EPA status (≤25 incidents per 10,000km sewer) by 2020.

For 2019:

• 22 sewerage pollution incidents (category 1 to 3) per 10,000km of sewer - this is rated as green
• performance was better than the sector average (37) for sewerage pollution incidents (category 1 to 3) per 10,000km of sewer

3. Serious pollution incidents (sewerage) metric (category 1 and 2)

Main facts

For 2019:

• 1 actual serious incident
• 75% fewer serious incidents per 10,000km sewer than in 2011

Annual number of serious pollution incidents (category 1 and 2) from Wessex Water sewerage assets, with EPA rating

2011 to 2015 data

Year	2011	2012	2013	2014	2015
EPA status	green	green	amber	amber	amber
Serious incidents per 10,000km sewer	1.2	0	3.5	1.7	1.7
Actual serious incident numbers	2	0	6	3	3

2016 to 2020 data

Year	2016	2017	2018	2019	2020
EPA status	amber	amber	amber	green	N/A
Serious incidents per 10,000km sewer	0.6	0.9	1.2	0.3	N/A
Actual serious incident numbers	2	3	4	1	N/A

Annual number of serious pollution incidents (category 1 and 2) from Wessex Water sewerage assets, also showing EPA status and thresholds

Graph note: the thresholds for a RAG status are shown in the graph background. EPA thresholds for normalised incidents (per 10,000km sewer) are shown in the EPA metric guide. They are revised every 5 years. Sewer length data was collected in 2011, then reviewed and adjusted where necessary in following years. Sewer length affects the actual number of serious incidents required to fall within a particular RAG status:

• green status for Wessex Water was equivalent to ≤2 actual serious incidents in 2011 to 2015 and ≤1 in 2016 to 2019
• red status for Wessex Water was equivalent to ≥7 actual serious incidents in 2011 to 2015, ≥5 in 2016 and ≥6 in 2017 to 2019

Number of serious pollution incidents (category 1 and 2) from Wessex Water sewerage and clean water supply assets in 2019

Asset type	Number of serious pollution incidents (category 1 and 2)
Combined sewer overflow	0
Foul sewer	0
Other water industry premises	0
Pumping station	0
Rising main	0
Sewage treatment works	1
Storm tank	0
Surface water outfall	0
Water distribution system (clean)*	0
Water treatment works (clean)*	0

*Water distribution system (clean) and water treatment works (clean) are not part of the EPA serious pollution incident (sewerage) metric.

For serious sewerage pollution incidents (category 1 and 2) we expect all water companies to achieve green EPA status (≤0.5 incidents per 10,000km sewer) by 2020.

For 2019:

• 0.3 serious sewerage pollution incidents (category 1 and 2) per 10,000km of sewer - this is rated as green
• performance was better than the sector average (0.9) for sewerage pollution incidents (category 1 and 2) per 10,000km of sewer

4. Discharge permit compliance metric

Main facts

For 2019:

• 299 permitted sewage treatment works (STW)
• 26 permitted water treatment works (WTW)

Annual discharge permit compliance (STW and from 2016 includes WTW) for Wessex Water, with EPA rating

2011 to 2015 data

Year	2011	2012	2013	2014	2015
EPA status	green	green	green	green	green
Percentage permit compliance	99.7	99.7	99.0	99.7	99.7
Number of permitted STW discharges	306	304	305	301	300
Number of non-compliant STW	1	1	3	1	1

2016 to 2020 data

Year	2016	2017	2018	2019	2020
EPA status	green	green	green	amber	N/A
Percentage permit compliance	99.4	99.0	100	98.5	N/A
Number of permitted STW discharges	297	292	291	299	N/A
Number of permitted WTW discharges	21	14	13	26	N/A
Number of non-compliant STW	2	2	0	4	N/A
Number of non-compliant WTW	0	1	0	1	N/A

Annual discharge permit compliance (STW and from 2016 includes WTW) for Wessex Water, also showing EPA status and thresholds

Graph note: the thresholds for a RAG status are shown in the graph background and in the EPA metric guide. They are revised every 5 years.

For discharge permit compliance we expect all water companies to achieve green EPA status (99%) by 2020.

For 2019:

• 98.5% discharge permit compliance - this is rated as amber
• 98.7% discharge permit compliance at STW and 96.2% discharge permit compliance at WTW
• performance was worse than the sector average (98.7%) for discharge permit compliance
• needed ≤3 failing sites to be rated as green

5. Self-reporting of pollution incidents metric

Main facts

For 2019:

• 85% incidents self-reported
• 94 incidents self-reported
• 16 incidents reported by others

Annual self-reporting of pollution incidents (category 1 to 3) from Wessex Water sewerage and clean water supply assets, with EPA rating

2011 to 2015 data

Year	2011	2012	2013	2014	2015
EPA status	amber	amber	amber	amber	green
Percentage of incidents self-reported	59	52	59	62	72
Number of incidents self-reported	38	34	53	53	75

2016 to 2020 data

Year	2016	2017	2018	2019	2020
EPA status	green	green	amber	green	N/A
Percentage of incidents self-reported	76	78	74	85	N/A
Number of incidents self-reported	73	80	78	94	N/A

Annual self-reporting of pollution incidents (category 1 to 3) from Wessex Water sewerage and clean water supply assets), also showing EPA status and thresholds

Graph note: the thresholds for a RAG status are shown in the graph background and in the EPA metric guide. They are revised every 5 years.

Self-reporting of pollution incidents (category 1 to 3) from Wessex Water sewerage and clean water supply assets in 2019

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	4	0
Foul sewer	22	9
Other water industry premises	0	0
Pumping station	4	1
Rising main	7	2
Sewage treatment works	23	1
Storm tank	0	0
Surface water outfall	2	1
Water distribution system (clean)	28	2
Water treatment works (clean)	4	0

Self-reporting of serious pollution incidents (category 1 and 2) from Wessex Water sewerage and clean water supply assets in 2019

Asset type	Number of pollution incidents self-reported (category 1 and 2)	Number of pollution incidents not self-reported (category 1 and 2)
Combined sewer overflow	0	0
Foul sewer	0	0
Other water industry premises	0	0
Pumping station	0	0
Rising main	0	0
Sewage treatment works	1	0
Storm tank	0	0
Surface water outfall	0	0
Water distribution system (clean)	0	0
Water treatment works (clean)	0	0

For self-reporting of pollution incidents we expect all water companies to achieve green EPA status (≥75%) by 2020.

For 2019:

• 85% self-reporting of pollution incidents - this is rated as green
• performance was better than the sector average (80%) for self-reporting of pollution incidents

6. National Environment Programme (NEP) delivery metric

Main facts

For the financial year ending 2020:

• 44 schemes were completed to the planned deadline
• 0 schemes were not completed to the planned deadline

Annual delivery of the NEP by Wessex 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)	106	102	105	100	100
Cumulative number of schemes completed during AMP period	71	102	130	151	4

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	N/A
Percentage of NEP complete to date (cumulative)	100	100	100	100	N/A
Cumulative number of schemes completed during AMP period	40	86	106	150	N/A

Table note: 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 schemes that were completed early before their planned year were not included in the cumulative delivery percentage until their planned year (cannot report over 100%). The thresholds for each RAG status are in the EPA metric guide. They are revised every 5 years.

For NEP delivery we expect all water companies to achieve green EPA status (≥99%) in any year.

For the financial year ending 2020:

• 100% NEP delivery - this is rated as green

7. Sludge disposal and use metric

Main facts

For 2019:

• 51,009t (tonnes) total volume produced (dry matter)
• 10,603ha (hectares) land used for spreading
• 100% of sludge produced was used in agriculture

Annual compliance with sludge disposal and use metric by Wessex 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

2016 to 2020 data

Year	2016	2017	2018	2019	2020
EPA status	green	green	N/A	N/A	N/A
Percentage of sludge compliant	100	100	N/A	N/A	N/A

Table note: from the 2018 calendar year, we suspended the metric from the EPA whilst we reviewed our regulatory regime for sludge. The thresholds for each RAG status are in the EPA metric guide. They are revised every 5 years.

Annual summary of sewage sludge disposal and use (dry matter) by Wessex Water

Year	Sewage sludge used in agriculture (t thousands)	Sewage sludge recovered non-agriculture (t thousands)	Sewage sludge disposed (t thousands)	Actual quantity produced (t thousands)
2011	69.8	4.0	0.7	74.4
2012	55.8	0.0	0.0	55.8
2013	54.3	0.0	0.0	54.3
2014	53.7	0.0	0.0	53.7
2015	52.1	0.0	0.0	52.1
2016	51.9	0.2	0.0	52.1
2017	52.8	0.0	0.0	52.8
2018	52.1	0.0	0.0	52.1
2019	51.0	0.0	0.0	51.0

8. Security of Supply Index (SoSI) metric

Main facts

For the financial year ending 2020:

• 1 water resource zone
• 337 Ml/d water distributed to the network (megalitres)

Annual compliance with SoSI by Wessex Water, with EPA ratings

Financial year ending	2017	2018	2019	2020	2021
EPA status	green	green	green	green	N/A
SoSI score	100	100	100	100	N/A

Table note: the thresholds for each RAG status are in the EPA metric guide.

For SoSI we expect all water companies to achieve green EPA status by 2020.

For the financial year ending 2020:

• score 100 - this is rated as green

9. Event Duration Monitoring (EDM) delivery

All water companies have investment in place to monitor the vast majority of storm overflows.

Installation of EDM monitors is mostly funded through the NEP however does not form part of the EPA NEP delivery metric.

Number of Wessex Water storm overflows with EDM

Year	2019
Total number of storm overflows	1,289
Number of storm overflows with annual data reported	605
Percentage company coverage	47