[] Sewage network
[] Non-drainable septic tank
[] Drainable septic tank
[] Untreated discharge into the environment
[] No sewage system

Sewage network is marked by the enumerator if the sewage system in the dwelling is connected to the public sewage network. A public sewage network is a network for discharge of waste water and rainwater from a connection in the settlement to outflow into open waters, ground or a treatment facility.

Non-drainable septic tank is marked by the enumerator if the sewage system in the dwelling is connected to a non-drainable septic tank. A non-drainable septic tank is a watertight collector of waste water from an individual building from which the collected waste water and excrement are taken to a municipal treatment plant. A non-drainable septic tank can only be emptied by taking away the excrement.

Drainable septic tank is marked by the enumerator if the sewage system in the dwelling is connected to a drainable septic tank. A drainable septic tank is a collector of waste water from an individual building from which the collected waste water and excrement can be taken in three ways: by taking away the excrement, by discharging into groundwater or by discharging into surface waters.

Untreated discharge into the environment is marked by the enumerator if waste water from a pipe leading from the building is discharged directly into the environment (frequently on surface into a canal by the house, into a stream, a river, a lake, a sea, etc.).

No sewage system is marked by the enumerator if the dwelling does not have a sewage system or a flush toilet.