While spaying is traditionally recommended for kitties between 4 and 6 months of age, spaying as young as 8 weeks old is considered safe, according to Cat Channel.
The national drinking water standards state that the maximum residual amount of chlorine is 4 mg/L. Untill recently the USA used chlorine gas extensively for wastewater treatment. Today, the use of chlorine has been forced back.
But 15 ppb is a regulatory measure, not a public health one. Researchers stress that there is no 100 percent safe level of lead in drinking water, only acceptable levels. Even levels as low as 5 ppb can be a cause for concern, according to the group studying Flint's water.