Disinfection byproducts · 2023
TTHM in Philadelphia, PA tap water
Philadelphia, PA's 2023 TTHM measurement is below the federal limit of 80 ug/L (MCL).
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Running annual avg Running Annual Average 2024 | 51 ug/L | 80 ug/L MCL |
Range System-Wide | 14–76 ug/L | 80 ug/L MCL |
Verbatim from Philadelphia, PA'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.
People also ask
+Is there TTHM in Philadelphia, PA tap water?
Yes — Philadelphia, PA's 2023 Consumer Confidence Report lists TTHM at 51 ug/L. Philadelphia, PA'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.
+Where does this TTHM measurement come from?
This page reproduces the TTHM entry from the 2023 Consumer Confidence Report published by the Philadelphia, PA 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/pa/philadelphia/2023/source.