Hello aspirant, 

The institutes offering btech in environmental engineering is listed below. 

INDIAN INSTITUTE OF TECHNOLOGY ( IIT KANPUR),KANPUR

INDIAN SCHOOL OF MINES ( IITISM),DHANBAD

JAGANNATH UNIVERSITY ,JAIPUR

CH. BRAHM PRAKASH GOVERNMENT ENGINEERING COLLEGE ( CBPGEC),NEW DELHI

COLLEGE OF AGRICULTURAL TECHNOLOGY ( CAT),THENI

HINDUSTAN COLLEGE OF SCIENCE AND TECHNOLOGY ( HCST),MATHURA

ADICHUNCHANAGIRI INSTITUTE OF TECHNOLOGY ( AIT CHIKMAGALUR),CHIKMAGALUR

AUM ENGINEERING AND MANAGEMENT INSTITUTE ( AEMI),MUMBAI

SRI JAYACHAMARAJENDRA COLLEGE OF ENGINEERING ( SJCE MYSORE),MYSURU

Hello Atul, 

I am providing you the list of best environmetal engineering colleges of india-

1 indian Institute of technology, Bombay 

2 Indian Institute of technology, madras

3 Indian Institute of technology, Delhi

4 Indian Institute of technology, khargpur 

5 Indian Institute of technology, kanpur

6 VIT, VELLORE

For more details you can check the link provided-

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

Hope this satisfies your query. 

Good luck