The number of complaints against Thames Water have increase by 13% in the past year. According to the report by the Consumer Council for Water the number of complaints against South East Water also increased by more than half.
The increases were in stark contrast to an average fall across England and Wales of almost 12%, reaching their lowest level since 2005. The annual Complaints Report shows 163,027 written complaints were made to water companies across England and Wales in the year to March 31, compared with 185,140 the previous year.
The Consumer Council for Water (CCW) said those falls showed it had successfully pressured companies to work hard to improve their services and increase customer satisfaction.
Steve George, customer services director at South East Water defended the increase in their complaints by 59% arguing "the increase occurred during the first half of last year, and we were particularly disappointed as it followed three years of reduced complaints."
Across the rest of England and Wales, 16 of the 23 water and sewerage companies reported a fall in complaints during the period.
Complaints in some areas of the South East rose significantly during the period.
South East Water's complaints increased by almost 5,0000 on the previous year, making it the worst performing company in the industry when comparing the number of complaints to the size of its customer base, CCW said.
- Dwr Cymru Welsh Water - 58% fewer complaints
- Wessex Water - 40% fewer complaints
- South East Water - 59% more complaints
- Thames Water - 13% more complaints
- Southern Water - 4% more complaints