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Disinfectant that can cause taste/odor issues and byproducts. Below are US cities ranked by their measured Chlorine levels compared to EPA limits. Higher percentages indicate greater concern.
Vulnerable Populations: Main concern is disinfection byproducts (THMs, HAAs) formed when chlorine reacts with organic matter - those have cancer risks.
Ranked by percentage of the EPA limit, using one real EPA measurement per water system. Click any city for its full report.
Historical data. Figure shown is the average of the system's 2012–2019 finished-water compliance samples (EPA Six-Year Review 4), non-detects counted as zero. Treat as history, not today's tap water.
EPA's public datasets do not carry per-system results for Chlorine in a form we can rank, so no city table is shown.
| Rank | City | State | Level | Period | EPA Limit | % of Limit | Status | Population |
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Standard carbon filters very effective. Pitchers, faucet-mount, or whole-house.
Enhanced carbon for chlorine and chloramine.
Copper-zinc media removes chlorine through chemical reaction.
Chlorine kills harmful bacteria and viruses, preventing waterborne diseases. It's essential for safe public water supplies.
At EPA-allowed levels, chlorine itself is not dangerous. The main concern is byproducts formed when chlorine reacts with organic matter.
Any activated carbon filter will effectively remove chlorine taste and odor. Even inexpensive pitcher filters work well.