Approximate UV Dose Required to Kill Contaminants

The following chart illustrates the approximate UV dose required to kill common waterborne pathogens including bacteria, viruses, and cysts as measured in mJ/cm2 (1000 μWs/cm2 = 1 mJ/cm2 ). This chart was compiled from various sources that are believed to be reliable, including Trojan Technologies, however, required dosages can vary in relation to your water's ultraviolet tranmittance (UVT), turbidity, and as a result of the presence of particular contaminants. Accordingly, these numbers should be used as a general guideline only.

Contaminant Dosage required to sterilize
99.99% Effectiveness
Cryptosporidium parvum oocysts 8
Giardia lamblia cysts (Beaver fever) <10
Vibrio cholerae (Cholera) 3
Shigella dysenteriae (Dysentery) 3
E.coli (Escherichia coli O157:H7) 6
Salmonella typhi (Typhoid fever) 9
Shigella sonnei 9
Legionella pneumophila (Legionaires' disease) 10
Salmonella enteritidis (causes gastroenteritis) 10
Hepatitis A virus 16 - 30
Poliovirus Type 1 21 - 30
Coxsackie B5 virus 30
Rotavirus SA11 31 - 36