A recently released World Health Organization (WHO) document has recommended a drinking water standard of 100 parts per billion (ppb), up from the previous WHO standard of two parts per billion. The atrazine drinking water standard enforced by the U.S. Environmental Protection Agency is three parts per billion
What will "The Frog Scientist " Tyrone Hayes Say Now?
3 ppb = 3 drops of atrazine diluted in a standard size swimming pool
100 ppb = 100 drops of atrazine diluted in a standard size swimming pool