Disinfection byproducts · 2023
TTHM in Los Angeles LADWP, CA tap water
Los Angeles LADWP, CA's 2023 TTHM measurement is below the federal limit of 80 ug/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Average System-wide | 34.4 ug/L | 80 ug/L MCL |
Range System-wide | 13.9–35.8 ug/L | 80 ug/L MCL |
Verbatim from Los Angeles LADWP, CA'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 Los Angeles LADWP, CA 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 Los Angeles LADWP, CA tap water?
Yes — Los Angeles LADWP, CA's 2023 Consumer Confidence Report lists TTHM at 34.4 ug/L. Los Angeles LADWP, CA's 2023 TTHM measurement is below the federal limit of 80 ug/L (MCL).
+What's the federal limit for TTHM in drinking water?
The federal MCL for TTHM is 80 ug/L. The EPA enforces this against the regulated reporting statistic (running annual average or 90th percentile), not a single-sample spike.
+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 Los Angeles LADWP, CA 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/ca/los-angeles-ladwp/2023/source.