Performance tables

We provide a wide range of non-financial data in the performance tables that Ofwat use to monitor company performance. This data feeds Ofwat's performance mechanisms such as the Service Incentive Mechanism (SIM) and the Serviceability assessment. It is also used to inform the content of Ofwat's annual reports which compare performance between companies. There are 34 performance tables in total. The information contained in the performance tables is wide ranging and varies from items like the number of water and wastewater treatment works to items such as population data for our region.

Table 1
The table above sets out details of our water service covering:
Promoting the efficient use of water (water efficiency)

Table 2
The table above sets out details of our water service covering:

  • DG2 (low pressure)
  • DG3 (interruptions to supply)
  • DG4 (water restrictions)

Table 3
The table above sets out details of our sewerage service covering:

  • DG5 (annual internal sewer flooding summary)
  • DG5 (properties on the internal sewer flooding register)

Table 3a
The table above sets out details of our sewerage service covering:

  • DG5 (annual external sewer flooding summary) and
  • DG5 (areas on the external sewer flooding register)

Table 4
The table above sets out details of our customer service covering:

  • DG6 (response to billing contacts)
  • Connected properties and billing denominators

Table 5
The table above sets out details of our customer service covering:

  • DG7 (response to written complaints)
  • DG8 (bills for metered customers)
  • DG9 (telephone contact)
  • Special assistance register

Table 5a
The table above sets out details of our DG7 response to written complaints - this covers complaints data for the Consumer Council for Water

Table 5b
The table above sets out details of the consumer experience measures covering:
unwanted telephone contacts and consumer experience satisfaction

Table 6
The table above sets out details of our customer service standards covering:

  • Statutory guaranteed standards scheme
  • Enhanced guaranteed standards scheme
  • Companies' customer charters

Table 6a
The table above sets out details of our bad debt - revenue outstanding and associated debt-related costs

Table 6b
The table above sets out details of our vulnerable customers - applications for vulnerable customer (WaterSure) status

Table 7
The table above sets out details of our water properties and population covering:

  • Properties
  • Population

Table 8
The table above sets out details of our water metering covering:

  • Household meter installations
  • Water demand of recently metered properties

Table 9
No table 9

Table 10
The table above sets out details of our water delivered covering:

  • Water delivered - volumes
  • Water delivered - components

Table 10a i
The table above sets out details of our security of supply index - planned level of service

Table 10 ii
No table 10 ii

Table 10a iii
The table above sets out details of our security of supply index - critical period

Table 10b i
The table above sets out details of our Environment Agency data - annual average out-turns

Table 10b ii
The table above sets out details of our Environment Agency data - critical period

Table 11
The table above sets out details of our water service activities covering:

  • Asset balance at year beginning
  • Changes during report year
  • Asset balance at end year
  • Distribution studies

Table 11a
The table above sets out details of our water service serviceability indicators covering:

  • Water treatment works - turbidity
  • Performance measures for water non-infrastructure assets
  • Serviceability - water service

Table 12
The table above sets out details of our water explanatory factors covering:

  • Source types
  • Pumping treatment types

Table 13
The table above sets out details of our sewerage properties and population covering:

  • Properties
  • Population

Table 14
The table above sets out details of our sewage collected covering:

  • Sewage - volumes

Table 15
The table above sets out details of our sewage treatment covering:

  • Sewage - loads
  • Sewerage service - facilities
  • Sewage sludge

Table 16
The table above sets out details of our sewerage service activities covering:

  • Asset balance at year beginning
  • Changes during report year
  • Asset balance at year end
  • Drainage area plans
  • Other sewerage service activities

Table 16a
The table above sets out details of our sewerage service serviceability indicators covering:

  • Enhanced measures for sewerage assets
  • Performance measures for sewerage non-infrastructure assets
  • Serviceability - sewerage service

Table 16b
The table above sets out details of our sewerage service serviceability indicators covering:

  • Sewage treatment works - BOD predicted performance
  • Sewage treatment works - SS predicted performance
  • Sewage treatment works - Ammonia predicted performance

Table 17
No table 17

Table 17a
The table above sets out details of our sewerage service explanatory factors covering:

  • Sewerage sub-area explanatory factors

Table 17b
The table above sets out details of our sewerage service explanatory factors covering:

  • Sewage treatment works: large works information database

Table 17c
The table above sets out details of our sewerage service explanatory factors covering:

  • Sewage treatment works: numbers

Table 17d
The table above sets out details of our sewerage service explanatory factors covering:

  • Sewage treatment works: loads

Table 17e
No table 17e

Table 17f
The table above sets out details of our sewerage service explanatory factors covering:

  • Sewage treatment works: costs

Table 41
The table above sets out details of our Health & Safety policy and performance covering:

  • Lost time and RIDDOR reports for staff and contractors

Table 42
The table above sets out details of our Greenhouse Gas Accounting

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