Disinfection byproducts · 2024
TTHM in St Louis, MO tap water
St Louis, MO's 2024 TTHM measurement is below the federal limit.
The measurement
| Statistic | Value | Federal limit |
|---|---|---|
Maximum System-wide | 30.5 ug/L | None set |
Range Range Detected | 5.9–30.5 ug/L | None set |
Running annual avg Distribution | 16.3 ug/L | None set |
Range Distribution | 6.2–27.3 ug/L | None set |
Reported level Sample Point | 1 ug/L | None set |
Range Distribution | 6.6–19 ug/L | None set |
Reported level Sample Point | 2 ug/L | None set |
Running annual avg Distribution | 18.2 ug/L | None set |
Range Distribution | 7.6–30.1 ug/L | None set |
Reported level Sample Point | 3 ug/L | None set |
Running annual avg Distribution | 15.9 ug/L | None set |
Range Distribution | 6.6–26.4 ug/L | None set |
Reported level Sample Point | 4 ug/L | None set |
Running annual avg Distribution | 18 ug/L | None set |
Range Distribution | 6.8–29.9 ug/L | None set |
Reported level Sample Point | 5 ug/L | None set |
Running annual avg Distribution | 13.9 ug/L | None set |
Range Distribution | 6.7–21.6 ug/L | None set |
Reported level Sample Point | 6 ug/L | None set |
Running annual avg Distribution | 14.4 ug/L | None set |
Range Distribution | 7–22.4 ug/L | None set |
Reported level Sample Point | 7 ug/L | None set |
Running annual avg Distribution | 16.2 ug/L | None set |
Range Distribution | 5.9–27.8 ug/L | None set |
Reported level Sample Point | 8 ug/L | None set |
Running annual avg Distribution | 13.3 ug/L | None set |
Reported level Sample Point | 9 ug/L | None set |
Running annual avg Distribution | 17.9 ug/L | None set |
Range Distribution | 6.8–30.5 ug/L | None set |
Reported level Sample Point | 10 ug/L | None set |
Running annual avg Distribution | 12.9 ug/L | None set |
Range Distribution | 6.2–19.7 ug/L | None set |
Reported level Sample Point | 11 ug/L | None set |
Range Distribution | 6.5–20.3 ug/L | None set |
Reported level Sample Point | 12 ug/L | None set |
Verbatim from St Louis, MO'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 St Louis, MO compares
Nearby systems also reporting TTHM:
People also ask
+Is there TTHM in St Louis, MO tap water?
Yes — St Louis, MO's 2024 Consumer Confidence Report lists TTHM at 18.2 ug/L. St Louis, MO's 2024 TTHM measurement is below the federal limit.
+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 2024 Consumer Confidence Report published by the St Louis, MO 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/mo/st-louis/2024/source.