Disinfection byproducts · 2024
TTHM in Rockville, MD tap water
Rockville, MD's 2024 TTHM level is between 80% and 100% of the federal limit — measured but not in violation.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Minimum System-wide | 20.6 ug/L | None set |
Maximum System-wide | 122 ug/L | None set |
Running annual avg System-wide | 69 ug/L | None set |
Verbatim from Rockville, MD's 2024 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 Rockville, MD compares
3 of the 40 MD 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 Rockville, MD tap water?
Yes — Rockville, MD's 2024 Consumer Confidence Report lists TTHM at 69 ug/L. Rockville, MD's 2024 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.
+Which other U.S. cities have TTHM over the federal limit?
3 of the 40 MD systems on The Water Map measuring TTHM report it at or above the federal limit. Examples include Freedom District, MD, Brunswick, MD, Keswick Multi Care Center, MD.
+Where does this TTHM measurement come from?
This page reproduces the TTHM entry from the 2024 Consumer Confidence Report published by the Rockville, MD 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/md/rockville/2024/source.