Hey Vikaash RS,

The top environmental engineering colleges in India are,

1. VIT University, Vellore

2. IIT, Madras

3. IIT, Bombay

4. IIT, Delhi

5. IIT, Kharagpur

6. IIT, Khanpur

7. Delhi Technological Univeristy, Delhi

8. NIT, Trichurapalli

9. SRM university, Chennai

10. NIT, Warangal.

for the entire list you can check in the given below link,

https://engineering.careers360.com/colleges/list-of-environmental-engineering-colleges-in-india

All the best!