Dear applicant since you have immense interest in the course M.E/ M.Tech Environment Engineering here are some wise options for you in South India like:

1. MIT Manipal

2. IIT Madras

3. SRM Institute of Technology

4. COEP ( Pune)

5. BMS College of Engineering, Bangalore

6. IIT Bombay

7. Maharaja Sayajirao University.

In North India you can choose colleges like

1. IIT Delhi

Go through the link to know the eligibility and detailed information brochure

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

Good luck!!