How trustworthy and reliable are the ISI marks?

A team of the Bureau of Indian Standards (BIS), Nagpur branch conducted a raid in the premises of Shri Balaji Food & Beverages located at Plot No. 14-15, Khasra No. 92, Beside Baidhanath Farms, Mouza- Shankarpur in the district. During the raid, the firm was found engaged in misuse of BIS Certification mark popularly known as ISI Mark on the product “Packaged Drinking Water (PDW)”, which comes under the mandatory certification scheme of BIS.