Septic tank
In the United States, the 2007 American Housing Survey indicated that about 20 percent of all households rely on septic tanks, and that the overwhelming majority of systems are located in rural (50%) and suburban (47%) areas. Indianapolis is one example of a large city where many of the city's neighborhoods still rely on separate septic systems. In Europe, septic systems are generally limited to rural areas.
Acton, London
Acton will host the starting point of the 25 kilometre Thames Tideway Tunnel (also known as the "Super Sewer") at the Acton Storm Tanks in Canham Road. This will be built to avoid the discharge of sewage from Combined Sewer Overflow into the River Thames.