Landscaping Lawn Care Does Chlorinated Water Kill Grass? By James Newsome Updated Nov 3, 2022 There is not enough chlorine in pool water to kill or even harm a lawn; however, nondiluted chlorine spilled on a lawn can be harsh enough to kill grass. Related How to Get Rid of Water Grass How to Kill Crabgrass in Centipede Lawns How Long Does It Take for Grass Seed to Sprout?