Sub-Divisional engineer of Irrigation and Public Health Department A C Chauhan, who was placed under suspension on January 25, was arrested today by the agency, SSP Shimla D W Negi said.
Contractor of Sewerage Treatment Plant at Malayana, who was the main accused in the case, was remanded to four days of police custody today, he said.
The special Investigation team was constituted by Shimla police to probe the causes for jaundice outbreak in Shimla town and fix the responsibility for the alleged lapses.
Earlier, a Junior Engineer and supervisor at the plant were arrested over alleged contamination of drinking water which led to spread of jaundice in Shimla.
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The SIT is probing the matter and more arrests are likely to be made, Negi said.
The agency is inquiring into various aspects of the case and the role of IPH, Pollution Control Board and Health department to ascertain that whether it was just negligence or complicity.
"The SIT would mow focus on lifting of water samples to find out that why contaminated water allowed to be distributed to the residents when it was revealed that the water at Ashwani Khud water supply scheme was contaminated at the source due to mixing of sewage," Negi said.
The number of jaundice cases has crossed the 1000 mark and the disease has spread from Shimla to Solan, prompting the government to take immediate effective steps to control the spread of the disease.