Bangaloreans need not be skeptical about ISI certification, in the wake of the mineral water controversy, as bottled water in the city is relatively safe and pesticide-free, according a top official from the Bureau of Indian Standard's (BIS) Bangalore office. "So far we have tested several samples in the city and never come across pesticide residues," BIS Regional Office Director P. Sengupta told this paper here on Friday. "The tests, conducted by highly reputed laboratories in the city, did not show any pesticide residue," he added.