Building and Developing
What is the difference between a foul sewer and a surface water sewer?
The foul sewer carries used wastewater to a sewage works for treatment. The surface water sewer carries uncontaminated rainwater directly to a local river, stream or soakaway.
Only rainwater run off should be connected to a surface water sewer. All other wastewater from sinks/toilets/baths/showers/washing machines/dishwashers/process water should be connected to a foul sewer.