Its likely a chemical added to combat algae and bacteria growth in the water supply, which are much higher in the summer heat. Chloramine i think its called? Its not gonna hurt you and evaporates quickly when exposed to air.
As a side note: dont water any garden plants with it until that stuff has had a day to evaporate, as soil bacteria are what break down organic material to feed your plants, and on top of that the chemical itself tends to stagnate plant growth too.
Its likely a chemical added to combat algae and bacteria growth in the water supply, which are much higher in the summer heat. Chloramine i think its called? Its not gonna hurt you and evaporates quickly when exposed to air.
As a side note: dont water any garden plants with it until that stuff has had a day to evaporate, as soil bacteria are what break down organic material to feed your plants, and on top of that the chemical itself tends to stagnate plant growth too.