Septic tank
While a properly maintained and located septic tank does not pose any more environmental problems than centralized municipal sewage treatment, certain problems can arise with septic tanks in unsuitable locations. Since septic systems require large drainfields, they are not suitable for densely built 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.