In 1994, STE with the collaboration of All India Institute of Hygiene & Public Health, Government of India undertook project on arsenic removal to provide arsenic free water. 1st arsenic removal plant installed by our organization in 1997. The plant was inaugurated by the Minister of PHED (West Bengal) on 23rd January 1997.

State Bank of India sanctioned a fund to install an arsenic removal plant in rural Bengal in 1998.

In the year 2000, in collaboration with AIIH&PH and India Canada Environment Facility started a program on Community based project to mitigate arsenic pollution in West Bengal.

In June 2001, organization had an opportunity to start a special clinic, which is first of its kind to provide free treatment to arsenic patients.

STE was also first to deal with the conservation of rainwater and started working on Water Harvesting project in 2003 using ponds in rural area to conserve rainwater.

A vocational training center was inaugurated for the arsenic patients in 2003 and setting up of a special hospital for arsenic patients is under process.

STE is working very actively with DRDO Ministry of Defence, Govt. of India to promote and implement a low cost arsenic removal technology developed by DRDO

STE had completed three projects from Deptt. of Science & Technology, Govt of India.to propagate and implement Arsenic / Iron removal technology in the affected areas.

Developed a model for sustainability of arsenic mitigation programme in the rural setup of India with the help of Indian Institute of management (IIM), Ahmedabad.

Projects were undertaken to mitigate arsenic / iron problem in 24 Parganas (N) & Nadia districts in West Bengal,Ballia district in Uttar Pradesh , Bhagalpur District in Bihar and Agartala in Tripura.

Since 1997 till date, Arsenic free drinking water has been provided to more than 1,00,000 people in India.

Already installed about 60-community type Arsenic Removal Plants and have distributed more than 5,000 domestic filters sofar.

STE is also conducting health camps in rural areas of West Bengal with the help of Doctor Volunteers.