Disinfection byproducts · 2025
TTHM in Yuma, AZ tap water
Yuma, AZ's 2025 TTHM level is between 80% and 100% of the federal limit — measured but not in violation.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Running annual avg System-wide | 79 ug/L | None set |
Range Sample Results | 37–96 ug/L | None set |
Verbatim from Yuma, AZ's 2025 Consumer Confidence Report — source document ↗
About TTHM
Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.
Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
How Yuma, AZ compares
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People also ask
+Is there TTHM in Yuma, AZ tap water?
Yes — Yuma, AZ's 2025 Consumer Confidence Report lists TTHM at 79 ug/L. Yuma, AZ's 2025 TTHM level is between 80% and 100% of the federal limit — measured but not in violation.
+What's the federal limit for TTHM in drinking water?
The EPA has not set an enforceable federal limit for TTHM. Utilities still report any measured levels in their annual Consumer Confidence Report.
+What is TTHM?
Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.
+Where does this TTHM measurement come from?
This page reproduces the TTHM entry from the 2025 Consumer Confidence Report published by the Yuma, AZ 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/az/yuma/2025/source.