The number of complaints about water-only companies rose 66% year-on-year following supply interruptions during extreme weather. Although billing disputes dominated the causes of grievances, water watchdog CCW said environmental factors such as the hot, dry summer and freeze-thaw in 2022 triggered an influx of customer complaints when water supplies were affected. South East was named as the most complained about water-only company with disputes related to the freeze thaw, and how subsequent compensation claims were dealt, leading to a surge in customer contacts.