Thames Water partners with ZSL to raise awareness for National Drainage Misconnection Day
Friday 31st March 2023 13:45
Thames Water's environmental protection team at London Zoo on National Drainage Misconnection Day
- The equivalent of 1.8 Olympic sized swimming pools of wastewater, enters our rivers and streams every day due to misconnected appliances.
- Since 2020, Thames Water has conducted 12,400 misconnection surveys.
- Thames Water, ZSL and local volunteers have since prevented 4,243 misconnected appliances from polluting watercourses across London and the Southeast.
- 89% of property owners rectify the issue before Local Authority involvement.
Misconnections happen when toilets and household appliances such as washing machines are incorrectly plumbed to the surface water sewer instead of the foul water sewer for treatment.
This causes problems because:
- The foul water sewer is designed to carry contaminated wastewater to a sewage works for treatment, whereas
- The surface water sewer is designed to carry uncontaminated rainwater directly to a local river, stream or soakaway.
We work with the Environment Agency, local authorities and the local community, to reduce pollution in the rivers and streams across our region caused by misconnected pipes.
Under Section 109 of the Water Industry Act 1991, its unlawful to discharge foul water into a sewer provided for surface water where separate sewers are provided for both foul and surface water.
The property owner is responsible for the repair and maintenance of the wastewater facilities and pipework, within the home and up to the point where the pipework meets the public sewer.