Disinfection byproducts · 2025
HAA5 in Columbus, OH tap water
Columbus, OH's 2025 HAA5 measurement is below the federal limit of 0.06 mg/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level Dublin Road Water Plant | 22.4 ug/L | None set |
Range Dublin Road Water Plant | 5.8–29.2 ug/L | None set |
Reported level Hap Cremean Water Plant | 37 ug/L | None set |
Range Hap Cremean Water Plant | 4.5–41.1 ug/L | None set |
Reported level Parsons Avenue Water Plant | 4.7 ug/L | None set |
Range Parsons Avenue Water Plant | 3.1–6.6 ug/L | None set |
Reported level Columbus Water | 0.019 mg/L | 0.06 mg/L MCL |
Verbatim from Columbus, OH's 2025 Consumer Confidence Report — source document ↗
About HAA5
Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.
Long-term exposure above the federal limit is associated with an increased cancer risk.
How Columbus, OH compares
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People also ask
+Is there HAA5 in Columbus, OH tap water?
Yes — Columbus, OH's 2025 Consumer Confidence Report lists HAA5 at 4.5–41.1 ug/L. Columbus, OH's 2025 HAA5 measurement is below the federal limit of 0.06 mg/L (MCL).
+What's the federal limit for HAA5 in drinking water?
The federal MCL for HAA5 is 0.06 mg/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+What is HAA5?
Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter. Long-term exposure above the federal limit is associated with an increased cancer risk.
+Where does this HAA5 measurement come from?
This page reproduces the HAA5 entry from the 2025 Consumer Confidence Report published by the Columbus, OH water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/oh/columbus/2025/source.