UV dose for 99.9% destruction

Ultraviolet light dose required for 99.9% destruction of various micro-organisms in microWatt seconds per square centimeter at wavelength 254 nanometers
Micro-organisms	UV dose
Bacteria
Agrobacterium tumefaceans	8500
Bacillus anthraci	8700
Bacillus megaterium	2500
Bacillus subtilis	11000
Clostridium tetani	22000
Corynebacterium diphtheriae	6500
Escherichia coli	7000
Legionella bozemanii	3500
Legionella dumoffii	5500
Legionella gormanii	4900
Legionella micdadei	3100
Legionella longbeachae	2900
Legionella pneumophila	3800
Leptospira interrogans (jaundice)	6000
Mycobacterium tuberculosis	10000
Neisseria catarrhalis	8500
Proteus vulgaris	6600
Pseudomonas aeruginosa	3900
Pseudomonas aeruginosa	10500
Rhodospirilium rubrum	6200
Salmonella enteritidis	7600
Salmonella paratyphi	6100
Salmonella typhimurium	15200
Salmonella typhosa (thyphoid)	6000
Sarcina lutea	26400
Serratia marcescens	6200
Shigella dysenteriae (dysentery)	4200
Shigella flexneri (dysentery)	3400
Shigella sonnei	7000
Staphylococcus opidermidis	5800
Staphylococcus aureus	7000
Streptococcus faecalis	10000
Strreptococcus hemolyticus	5500
Streptococcus lactis	8000
Viridans streptococcus	3800
Vibrio cholerae (cholera)	6500
Mold Spores
Mucor ramosissimus	35200
Penicillum expensum	22000
Penicillum roqueforti	26400
Algae
Cholorella vulgaris	22000
Viruses
Bacteriophage (E. Coli)	6600
Hepatitis virus	8000
Influenza virus	6600
Poliovirus	21000
Rotavirus	24000
Yeast
Baker's yeast	8800
Brewer's yeast	6600
Common yeast cake	13200
Saccharomyces var.ellipsoideus	13200
Saccharomyces sp	17600
Cysts
Cysts normally cannot be killed with UV, but are removed with a sub-micron filter such as the EPCB (extended pass carbon block) filter.
Cysts include Giardia Llamblia and Cryptosporidium.

For point of use home systems a UV of about 16,000 microwatts energy is preferable.