Listed below is a timeline of approval dates:

1893 – Ozone was used as a disinfectant in drinking water

1909 – Ozone was used in food preservation in cold storage

1918 – Ozone was used in the United States in pools

1939 – Ozone was proven to prevent the growth of yeast and mold

1975 – FDA approved ozone as good manufacturing practice

1976 – EPA approved ozone as an antimicrobial

1982 – FDA approved ozone for the bottled water industry

1986 – The 
City of Los Angeles built the second largest ozone
facility sanitizing 600 million gallons of water a day

1996 – USDA approved ozone as a disinfectant

1997 – FDA/USDA approved ozone as generally regarded as safe

1999 – EPA approved ozone safe for surface and ground water

2001 – FDA approved ozone as an antimicrobial agent on direct food sanitation

2004 – USDA approved ozone to be on the national organic program for sanitation

Ozone History