Disinfection byproducts · 2023
TTHM in Houston, TX tap water
Houston, TX's 2023 report shows TTHM detected, but the EPA has not set an enforceable federal limit for it.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Minimum System-wide | 14.2 ug/L | None set |
Maximum System-wide | 2.4 ug/L | None set |
Minimum System-wide | 45 ug/L | None set |
Maximum System-wide | 45 ug/L | None set |
Minimum System-wide | 2.4 ug/L | None set |
Average System-wide | 45 ug/L | None set |
Average System-wide | 2.2 ug/L | None set |
Maximum System-wide | 14.2 ug/L | None set |
Average System-wide | 2.4 ug/L | None set |
Average System-wide | 14.2 ug/L | None set |
Average System-wide | 15.9 ug/L | None set |
Average System-wide | 4.05 ug/L | None set |
Verbatim from Houston, TX's 2023 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 Houston, TX compares
5 of the 395 systems measuring TTHM on The Water Map have it at or above the federal limit:
Nearby systems also reporting TTHM:
People also ask
+Is there TTHM in Houston, TX tap water?
Yes — Houston, TX's 2023 Consumer Confidence Report lists TTHM at 45 ug/L. Houston, TX's 2023 report shows TTHM detected, but the EPA has not set an enforceable federal limit for it.
+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.
+Which other U.S. cities have TTHM over the federal limit?
5 of the 395 systems on The Water Map measuring TTHM report it at or above the federal limit. Examples include Albuquerque, NM, City of Hemet, CA, City of Menifee, CA.
+Where does this TTHM measurement come from?
This page reproduces the TTHM entry from the 2023 Consumer Confidence Report published by the Houston, TX 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/tx/houston/2023/source.