Water Safety What level of chlorine kills E. coli? March 6, 2026 by Myaya | Leave a Comment Chlorine levels of 0.5 to 1 part per million (ppm) are generally effective at killing E. coli in swimming pools and recreational water. For drinking water, higher concentrations are typically used to ensure safety. How Much Chlorine Does It Take to Kill E. coli? Understanding the right amount of chlorine is crucial for maintaining safe […] Read more ยป