| Region/Selected State-wise Water Supply Investigations in India (2018-2019) | ||
| Regions | States/UTs | No. of Water Supply Investigations |
| North Western Region, Chandigarh | ||
| North West Himalayan Region (NWHR), Jammu | ||
| North Himalayan Region (NHR), Dharamshala | ||
| North Central Region (NCR), Bhopal | ||
| Western Region, Jaipur | ||
| Northern Region, Lucknow | ||
| Uttaranchal Region, Dehradun | ||
| North Eastern Region (NER), Guwahati | ||
| Central Region (CR), Nagpur | ||
| Southern Western Region (SWR), Bangalore | ||
| South Eastern Coastal Region (SECR), Chennai | ||
| Southern Region (SR), Hyderabad | ||
| Total | ||
