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.
Penrith railway station, Sydney
There is a water tank built in 1921, at the Sydney end of the station. It was built in the Newcastle PerWay Workshop and is one of 82 extant tanks in NSW but one of only three in Sydney (2009). The water tank was erected to serve the expanding traffic needs for the Penrith Station, an important locomotive service stop prior to the Blue Mountains ascent. It was part of a series of water tanks at Penrith, with smaller ones for older locomotives replaced by this tank, while other earlier ones were still used at the Loco Depot until it was phased out.