Disinfection byproducts · 2025
HAA5 in Columbus, OH tap water
Columbus, OH's 2025 Consumer Confidence Report shows HAA5 at or above the federal limit (60 ug/L MCL). Measured value is 33.8× the threshold.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Reported level Parsons Avenue Water Plant | 4.7 ug/L | 60 ug/L MCL |
Reported level Dublin Road Water Plant | 22.4 ug/L | 60 ug/L MCL |
Range Parsons Avenue Water Plant | 3.1–6.6 ug/L | 60 ug/L MCL |
Reported level Hap Cremean Water Plant | 37 ug/L | 60 ug/L MCL |
Range Dublin Road Water Plant | 5.8–29.2 ug/L | 60 ug/L MCL |
Range Hap Cremean Water Plant | 4.5–41.1 ug/L | 60 ug/L MCL |
Reported level Columbus Water | 0.019 | 0.06 MCL |
Reported level When we checked | 2025 ug/L | 60 ug/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
5 of the 377 systems measuring HAA5 on The Water Map have it at or above the federal limit:
Nearby systems also reporting HAA5:
People also ask
+Is there HAA5 in Columbus, OH tap water?
Yes — Columbus, OH's 2025 Consumer Confidence Report lists HAA5 at 2025 ug/L. Columbus, OH's 2025 Consumer Confidence Report shows HAA5 at or above the federal limit (60 ug/L MCL). Measured value is 33.8× the threshold.
+What's the federal limit for HAA5 in drinking water?
The federal MCL for HAA5 is 60 ug/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.
+Which other U.S. cities have HAA5 over the federal limit?
5 of the 377 systems on The Water Map measuring HAA5 report it at or above the federal limit. Examples include Albuquerque, NM, Hollywood, FL, Mcallen, TX.
+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.