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.
Bon Secours Mother and Baby Home
Corless's original research noted that the site was also the location of a septic tank when overlaid with maps of the period of use as a workhouse. The 2017 report by an Expert Technical Group, commissioned by the Department of Children and Youth Affairs, confirmed that the vault was a sewage tank after reviewing historical records and conducting a magnetometer survey; it concluded, "The combination of an institutional boarding home and commingled interments of juvenile remains in a sewage treatment system is a unique situation, with no directly comparable domestic or international cases."