system
Given the following post, respond as if you're commenting on Reddit:
human
Does chlorine that settles in to ground when irrigating lawns or draining swimming pools degrade into something else, or remain unchanged?

I work in water utilities. 99% of residents in my city irrigate their lawns with city water, and we like chlorine to be 1.8-2.1 in this city. All run off from irrigation and when people drain pools and the like seeps into their lawn, and all water eventually makes it to the lake system. It's common knowledge here that chlorinated water once "filtered" through ones lawn removes nearly all the of the chlorine from the water by the time it makes its way back into our lake system. 

So my questions is, does all that chlorine sit in the ground unchanged? Or does it eventually degrade into something else?
gpt
Chlorine gas is very reactive and can oxidize most organic matter it comes in contact with. It does not stay chlorine for very long in an high-organic load environment such as soil. The chlorine in treated water will gain two electrons from something in the environment and become two chloride ions (Cl-).