Parameters BIS ISI UPPCB USPHS DO (mg/l) >5.0 >5.0 -- >4.0 BOD5 (mg/l) <3.0 30 30 -- COD (mg/l) <20.0 <20 250 --

Table 3: Standards of water quality. Standard of different category of water have been prescribed by different health agencies. BIS=Bureau of Indian Standard; ISI=International System of Units; UPPCB=Uttar Pradesh Pollution Control Board; USPHS=United State Public Health service.