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 sorry for little late response as i was out in field in remote areas.
Constructions of submersible pumps are done by many pump manufacturing businesses in India. This can be purchased off the shelf depending on the specification required as may be determined by the following:
1. Depth of water table in the area,
2. Height of the overhead tank,
3. Distance of the end user of water from overhead tank,

How much is cost of water reduced per household.
It needs to be noted here that safe water management by the community is of prime importance. Prior to installation of submersible pumps, functional water committees needs to be in place for determining the end users fees which also acts as a corpus for maintenance. It is to be note that without formation of water committees this initiative may be failure. Secondly, the local municipality should be a stakeholder in the entire process as groundwater is being used and their permission is required for installation of submersible pumps in any bore well.
The location and depth of tubewellsmust be surveyed and integrated with diarrhea and other waterborne disease and other data in a geographic information system. A proxy for tubewell access needs to be developed initially by calculating the local density of tubewells around households. Other issues of importance in water development programmes are wealth, adult female education, flood control, population density and the children ages are to be considered as potential confounders.
Increased access to tubewells is associated with a lower risk of childhood diarrhea. Intermediate- depth wells are associated with more childhood diarrhea compared to shallower or deeper wells. These findings may have implications for on-going efforts to reduce exposure to elevated levels of arsenic contained in groundwater that is pumped from shallow tubewells in most suburban municipalities in West Bengal. It is also very important that groundwater in and around Kolkata is not considered safe for drinking due to the high impact of contamination and pollution. There for it is advisable to first treat the water pumped from tube wells into a central treatment plant before it is sent to the end user.
All of the above factors play and important role in determining the cost benefit analysis.

For one facility how many households will it serve?
Upto 250 individuals (drinking, washing, bathing). Water for animals is separate.

The depth of groundwater varies from place to place and is best if determined locally from the local municipality.

 sorry for little late response as i was out in field in remote areas.
Constructions of submersible pumps are done by many pump manufacturing businesses in India. This can be purchased off the shelf depending on the specification required as may be determined by the following:
1. Depth of water table in the area,
2. Height of the overhead tank,
3. Distance of the end user of water from overhead tank,

How much is cost of water reduced per household.
It needs to be noted here that safe water management by the community is of prime importance. Prior to installation of submersible pumps, functional water committees needs to be in place for determining the end users fees which also acts as a corpus for maintenance. It is to be note that without formation of water committees this initiative may be failure. Secondly, the local municipality should be a stakeholder in the entire process as groundwater is being used and their permission is required for installation of submersible pumps in any bore well.
The location and depth of tubewellsmust be surveyed and integrated with diarrhea and other waterborne disease and other data in a geographic information system. A proxy for tubewell access needs to be developed initially by calculating the local density of tubewells around households. Other issues of importance in water development programmes are wealth, adult female education, flood control, population density and the children ages are to be considered as potential confounders.
Increased access to tubewells is associated with a lower risk of childhood diarrhea. Intermediate- depth wells are associated with more childhood diarrhea compared to shallower or deeper wells. These findings may have implications for on-going efforts to reduce exposure to elevated levels of arsenic contained in groundwater that is pumped from shallow tubewells in most suburban municipalities in West Bengal. It is also very important that groundwater in and around Kolkata is not considered safe for drinking due to the high impact of contamination and pollution. There for it is advisable to first treat the water pumped from tube wells into a central treatment plant before it is sent to the end user.
All of the above factors play and important role in determining the cost benefit analysis.

For one facility how many households will it serve?
Upto 250 individuals (drinking, washing, bathing). Water for animals is separate.

The depth of groundwater varies from place to place and is best if determined locally from the local municipality.

Yes our team at caritas has some experience of working in similar condition. In Kolkata we shall partner with Seva Kendra Calcutta who has been experimenting such initiatives for some time now