| Regions/Selected Water Supply Investigations in India (2014-2015) | ||
| Region | States/UT | No. of Water Supply Investigations |
| North Western Himalayan Region | ||
| North Western Region | ||
| West Central Region | ||
| Western Region | ||
| North Central Region | ||
| North Central Chhattisgarh Region | ||
| Central Region | ||
| Northern Region | ||
| Eastern Region | ||
| North Eastern Region | ||
| Mid Estern Region | ||
| South Estern Region | ||
| Southern Region | ||
| South Western Region | ||
| South Eastern Coastal Region | ||
| Kerala Region | ||
| Uttarakhand Region (UR), Dehradun | ||
| North Himalyan Region (NHR), Dharamshala | ||
| State Unit Office (SUO), Delhi | ||
| Total | ||
