If bore well water is used for domestic purpose than this may be a very serious matter. All above constituents have different properties and their treatment method  for reducing/removing from water will not be uniform. It is noted, nitrite is unstable and soon it is converted into nitrate. This question is very much alarming and mass awareness is needed.

For nitrite treatment

1). Reverse Osmosis (RO)

2). Water Softening : Anion Exchange

3).Distillation

Please see the link: http://des.nh.gov/organization/commissioner/pip/factsheets/dwgb/documents/dwgb-3-9.pdf

For heavy metal treatment

https://en.wikipedia.org/wiki/Groundwater_remediation

http://www.ipcbee.com/vol30/011--ICEST2012_N10010.pdf

For nitrite treatment

1). Reverse Osmosis (RO)

2). Water Softening : Anion Exchange

3).Distillation

Please see the link: http://des.nh.gov/organization/commissioner/pip/factsheets/dwgb/documents/dwgb-3-9.pdf

For heavy metal treatment

https://en.wikipedia.org/wiki/Groundwater_remediation

http://www.ipcbee.com/vol30/011--ICEST2012_N10010.pdf

The reverse osmosis is the only best option 

Nitrate cannot be completely removed from water but still reverse osmosis and distillation will be good options. It is also suggested to identify the source of contamination and reduce the contamination which help the water for self purification.

Nitrate cannot be completely removed from water but still reverse osmosis and distillation will be good options. It is also suggested to identify the source of contamination and reduce the contamination which help the water for self purification.

Presence of Pb, Cd, Cr, Fe , Ni and nitrate in water should present within permissible limit of drinking / domestic water. If exceeds, these may create health hazards. As such,No single method may not solve the problem. It will be extremely good , if RO has capability to do this. Therefore after water treatment with RO, if the water become within permissible will be a great news for all of us. Thus chemical analysis is more important before sampling and after treatment.

I need treatment options for borehole water with saline.

This project is for irrigation works