Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre? / Chemical Environmental Engineering / By admin Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is _______________ micro gram (μ g)/litre? A. 22B. 42 C. 332 D. 1050
