Questions 45-55 should be filled out for households residing in Conventional residential unit (number 1 in Question 44)

55. Place of sewage disposal for the housing unit

35. General explanation about Questions 45 through 55
Fill these questions only for those households who live in a conventional residential unit (box 1 question 44) and leave it blank for households living in other types of units.

46. Place of sewage disposal for the housing unit, Question 55
In this question, sewage means the wastewater from the water used in the housing unit. Based on the following explanations, ask the place of sewage disposal of the housing unit, separated by wastewater related to bathroom, kitchen, etc. and if the answer matches one of the 1 to 5 options, mark the proper box, otherwise mark box 6.
[] 1, Public sewage network: for those housing units where the sewage is connected to that of the city or village, mark box 1.
In recent years, the department of energy (water and sewage companies) has started building a public sewage network and selling branching. In these areas, all or part of the housing units' sewage enters the public network and gets disposed.
Note that only buying a sewage branching by the household or the households residing in the housing unit does not mean that the unit's sewage is connected to the public sewage network; more detail is needed.
[] 2, Private network: for those housing units where the sewage is connected to the private network, meaning the network of a town, apartment complex and similar, and gets disposed this way, mark box 2. Note that these networks, which might also have a refinery, are created by the developers of the town, complex, etc., and are often not under the surveillance of water and sewage companies.
[] 3, Absorbing well: all or part of most of the housing units' sewage, especially in urbanized areas, are disposed through some wells that have been dug during building construction and are known as absorbing wells. Mark box 3 for these units.
[] 4, Specific sewage tank (septic tank): in some housing units in urbanized areas which are often located in high-rises and skyscrapers, the sewage gets disposed through entering a specific tank designed for this matter which is known as a septic tank. These tanks are used in the buildings with or without drainage and are dischargeable. Mark box 4 for these units.
[] 5, Area around the unit: in some housing units, sewage exits the unit and enters the surrounded areas, runs on the surface of alleys, streets, water courses, streams, river, lands, farms, etc. and gets disposed. Mark box 5 for these kinds of units.
[] 6, Other: for those housing units in which the manner of sewage disposal is none of the above mentioned, mark box 6.
Note: in this question you should mark a box (related to the main part of the unit's sewage) for each kind of wastewater.